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| Open AccessInverse design of glass structure with deep graph neural networks
The inverse design of the material for given target property is challenging for glasses due to their disordered non-prototypical structure. Wang and Zhang propose a data-driven property oriented inverse approach for design of glassy materials with desired functionalities.
- Qi Wang
- & Longfei Zhang
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Article
| Open AccessAtomistic processes of surface-diffusion-induced abnormal softening in nanoscale metallic crystals
As the sample size goes down to the nanoscale, the surface-related mechanism plays an important role in the deformation of nanoscale crystals. Here, the authors report breakdown of the traditional Hall-Petch-like relation in nanoscale Ag attributed to diffusion-involved nucleation behaviors.
- Xiang Wang
- , Sixue Zheng
- & Scott X. Mao
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Article
| Open AccessAdditive manufacturing of strong silica sand structures enabled by polyethyleneimine binder
The limited strength of green parts have been a major hurdle in the Binder Jet Additive Manufacturing. Here the authors apply polyethyleneimine binder to print silica sand structures with double the flexural strength of green parts and 8-fold increase in the strength upon reactive infiltration.
- Dustin B. Gilmer
- , Lu Han
- & Tomonori Saito
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Article
| Open AccessAchieving high strength and ductility in ODS-W alloy by employing oxide@W core-shell nanopowder as precursor
Aggregation and coarsening of the second-phase oxide particles at grain boundaries have been a bottleneck for improving mechanical properties of oxide-dispersion-strengthened (ODS) alloys. Here the authors employ core-shell nanopowder precursors to achieve uniform dispersion of oxides in ODS alloys.
- Zhi Dong
- , Zongqing Ma
- & Yongchang Liu
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Article
| Open AccessBowls, vases and goblets—the microcrockery of polymer and nanocomposite morphology revealed by two-photon optical tomography
The morphology of semicrystalline plastics on the 1-100 μm scale, such as spherulites, strongly affect mechanical and other properties of the material but currently only 2D imaging techniques are available. Here, the authors use fluorescence labels and confocal microscopy to visualize the internal structure of neat polymers and composites in 3D and reveal unsuspected morphologies.
- Shu-Gui Yang
- , Zhen-Zhen Wei
- & Goran Ungar
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Article
| Open AccessCreating synthetic spaces for higher-order topological sound transport
The authors create synthetic dimensions in acoustic crystals composed of cavity arrays, strongly coupled through modulated channels. They provide evidence for 1D and 2D dynamic topological pumping, and show that the higher-order topological sound transport is robust against the geometrical imperfections.
- Hui Chen
- , Hongkuan Zhang
- & Guoliang Huang
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Article
| Open AccessSimultaneously enhancing the ultimate strength and ductility of high-entropy alloys via short-range ordering
The strength-ductility trade-off has been a long-standing problem for alloy development. Here the authors present a route for designing high-entropy alloys to overcome this trade-off via short-range ordering shown by combined Monte Carlo, molecular dynamic, and density-functional theory simulations.
- Shuai Chen
- , Zachary H. Aitken
- & Yong-Wei Zhang
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| Open AccessAtomistic simulations of dislocation mobility in refractory high-entropy alloys and the effect of chemical short-range order
Refractory high entropy alloys hold big promise for elevated-temperature applications. Here the authors investigate the influence of short-range order on the mobility of dislocations in high-entropy alloys by large-scale molecular dynamics simulation based on a machine-learning interatomic potential.
- Sheng Yin
- , Yunxing Zuo
- & Robert O. Ritchie
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Article
| Open AccessShear band-driven precipitate dispersion for ultrastrong ductile medium-entropy alloys
Precipitation hardening, used as an effective strengthening strategy in various alloy systems, has been usually achieved by coherent precipitates. Here, the authors develop ultrastrong ductile alloys employing structurally dissimilar semicoherent precipitates by shear band-driven precipitation.
- Tae Jin Jang
- , Won Seok Choi
- & Seok Su Sohn
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| Open AccessEvading strength-corrosion tradeoff in Mg alloys via dense ultrafine twins
Conventional ultrafine grains can generate high-strength Mg alloys, but non-equilibrium grain boundaries deteriorates their corrosion resistance. Here, the authors present ultrafine grained Mg alloys with dense twins that display high strength and reduced corrosion rate by one order of magnitude.
- Changjian Yan
- , Yunchang Xin
- & Qing Liu
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Article
| Open AccessThe origin of the boundary strengthening in polycrystal-inspired architected materials
Polycrystal-inspired architected materials are found to be high strength and damage tolerant. Here, the authors conduct in-depth work to unravel the mechanism responsible for the hardening phenomenon, in particular the role of polygrain-like boundary in the post-yield shear band activities.
- Chen Liu
- , Jedsada Lertthanasarn
- & Minh-Son Pham
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Article
| Open AccessHigh-throughput design of high-performance lightweight high-entropy alloys
Advanced screening strategies for the design of high-entropy alloys are highly desirable. Here the authors use the project-oriented design strategy and CALPHAD-based high-throughput calculation tool to rapidly screen promising Al-Cr-Fe-Mn-Ti structural HEAs for high-temperature applications.
- Rui Feng
- , Chuan Zhang
- & Peter K. Liaw
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Article
| Open AccessTransparent origami glass
Glass is indispensable but its processing options are limited. Here the authors extend origami techniques to shaping three-dimensional transparent glass by introducing physical cavitation and chemical dynamic bond exchange in the pre-glass polymer-silica nanocomposites.
- Yang Xu
- , Ye Li
- & Tao Xie
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Article
| Open AccessSuper-elasticity at 4 K of covalently crosslinked polyimide aerogels with negative Poisson’s ratio
The deep cryogenic temperatures present significant challenges for the performance of elastic materials. Here, the authors present a low density covalently crosslinked polyimide (PI) aerogels with super-elastic properties at deep cryogenic temperatures.
- Yang Cheng
- , Xiang Zhang
- & Mingxin Ye
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Article
| Open AccessNanoengineering of cathode layers for solid oxide fuel cells to achieve superior power densities
High-performance cathode materials are crucial for the development of solid oxide fuel cells. Here, the authors present a nanoengineering approach to boost cathode performance in conventional anode-supported cells, demonstrating a viable route to attaining higher power output.
- Katherine Develos-Bagarinao
- , Tomohiro Ishiyama
- & Katsuhiko Yamaji
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Article
| Open AccessStatic-state particle fabrication via rapid vitrification of a thixotropic medium
Upscale fabrication of functionalized microparticles is a pending challenge. Here, Kim et al. exploit the rheology of a thixotropic medium to grind sizeable amounts of raw material into well-defined colloidal dispersions, physically stabilized for further production steps.
- Sang Yup Kim
- , Shanliangzi Liu
- & Rebecca Kramer-Bottiglio
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Article
| Open AccessStacking fault energy in concentrated alloys
The stacking fault energy is connected to the response of crystals to deformation. Here the authors report a computational study in a model NiCo system to demonstrate the key importance of the dislocation/solute interaction for the accurate assessment of stacking fault energy in alloys beyond dilute limit.
- Mulaine Shih
- , Jiashi Miao
- & Maryam Ghazisaeidi
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| Open AccessEnhancing fatigue life by ductile-transformable multicomponent B2 precipitates in a high-entropy alloy
A fundamental understanding of fatigue-failure mechanisms is key to develop robust structural materials. Here the authors report a high entropy alloy with enhanced fatigue life by ductile transformable multicomponent B2 precipitates, as revealed by combined experimental and simulation methods.
- Rui Feng
- , You Rao
- & Peter. K. Liaw
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Article
| Open AccessUnique and universal dew-repellency of nanocones
Spontaneous jumping of condensing droplets holds promise for antifogging, but is generally inhibited for microdroplets. Lecointre et al. show that antifogging ability of cone structures at nanoscales is universal over a large range of cone sizes, shapes, apex angles and even truncation.
- Pierre Lecointre
- , Sophia Laney
- & David Quéré
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| Open AccessProbing of the internal damage morphology in multilayered high-temperature superconducting wires
Damage that occurs in second generation high-temperature-superconducting wires is problematic. Here, the authors present real-time magnetic flux behaviour in these wires under tensile strain and reveal damage evolution, including the amorphous phase in the superconducting layer acting in crack blunting during tension
- You-He Zhou
- , Cong Liu
- & Xingyi Zhang
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Article
| Open AccessTuning network topology and vibrational mode localization to achieve ultralow thermal conductivity in amorphous chalcogenides
The reduction in thermal conductivity is usually achieved by increasing the scattering rate or localization of heat carriers. Here, the authors propose a mechanism to suppress the thermal transport in amorphous systems such as SiTe binary alloys via tailoring the cross-linking network between the atoms.
- Kiumars Aryana
- , Derek A. Stewart
- & Patrick E. Hopkins
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| Open AccessIn situ correlation between metastable phase-transformation mechanism and kinetics in a metallic glass
The competition between the formation of different phases and their kinetics need to be clearly understood to make materials with on-demand and multifaceted properties. Here, the authors reveal, by a combination of complementary in situ techniques, the mechanism of a Cu-Zr-Al metallic glass’s high propensity for metastable phase formation, which is partially through a kinetic mechanism of Al partitioning.
- Jiri Orava
- , Shanoob Balachandran
- & Ivan Kaban
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Article
| Open AccessRapid synchronized fabrication of vascularized thermosets and composites
Bioinspired vascular networks transport heat and mass in multifunctional materials but lengthy multistep fabrication processes hinder large-scale application of structural vascular materials. Here, the authors report rapid, scalable, and synchronized fabrication of vascular thermosets and fiberreinforced composites under ambient conditions.
- Mayank Garg
- , Jia En Aw
- & Nancy R. Sottos
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| Open AccessExplosive fragmentation of Prince Rupert’s drops leads to well-defined fragment sizes
Fragmentation of breaking glass as a brittle solid is a problem of equal practical and theoretical importance. Kooij et al. demonstrate that the fragment size distribution can surprisingly be both, either power-law or exponential, depending on how a particular specimen is broken.
- Stefan Kooij
- , Gerard van Dalen
- & Daniel Bonn
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Article
| Open AccessMagnetic Janssen effect
The Janssen effect refers to the saturation of the apparent mass of a column of granular material, due to friction with the boundary of the column. Here, using ferromagnetic beads, Thorens et al. succeed in controlling the apparent mass of the column via an applied magnetic field.
- L. Thorens
- , K. J. Måløy
- & S. Santucci
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Article
| Open AccessUltra-strong polymeric hollow fiber membranes for saline dewatering and desalination
Osmotically assisted reverse osmosis can overcome limitations of the reverse osmosis process but a strong membrane which can withstand a high hydraulic pressure is crucial. Here, the authors develop strong polymer thin film composite hollow fiber membranes with exceptionally high hydraulic burst pressures of up to 110 bar, while maintaining high water permeance and salt rejection.
- Can Zeng Liang
- , Mohammad Askari
- & Tai-Shung Chung
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Article
| Open AccessMicroscale Schottky superlubric generator with high direct-current density and ultralong life
It is difficult to achieve high current density and long lifetime for micro generators owing to the common friction and wear. Here the authors invent a microscale Schottky superlubric generator to tackle this issue, reporting not only high current and power densities but also long lifetime of at least 5,000 cycles.
- Xuanyu Huang
- , Xiaojian Xiang
- & Quanshui Zheng
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| Open AccessTimely and atomic-resolved high-temperature mechanical investigation of ductile fracture and atomistic mechanisms of tungsten
High-temperature deformation of materials is challenging to evaluate. Here the authors develop a novel device that allows atomic resolved in situ high temperature mechanical tests inside a transmission electron microscope and reveal ductile fracture of a single crystal tungsten deformed at 973 K.
- Jianfei Zhang
- , Yurong Li
- & Xiaodong Han
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Article
| Open AccessOrthogonal photochemistry-assisted printing of 3D tough and stretchable conductive hydrogels
3D-printing tough conductive hydrogels (TCHs) with complex structures is still a challenging task due to their inherent contrasting multinetworks, uncontrollable and slow polymerization. Here the authors show an orthogonal photochemistry-assisted printing strategy to make 3D TCHs in one pot.
- Hongqiu Wei
- , Ming Lei
- & You Yu
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Article
| Open AccessStrain rate dependency of dislocation plasticity
The relationship between the strain rate and micro-scale deformation in metals is still poorly understood. Here the authors use discrete dislocation dynamics and molecular dynamics to establish a universal relationship between material strength, dislocation density, strain rate and dislocation mobility in fcc metals.
- Haidong Fan
- , Qingyuan Wang
- & Michael Zaiser
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Article
| Open AccessUnusual hydrogen implanted gold with lattice contraction at increased hydrogen content
Hydrogen can be absorbed into various metals, but generally causes the metals to expand. Here the authors show that when hydrogen is dynamically bound to the lattice, as in dilute Au:H solutions, the gold contracts accordingly.
- Khac Thuan Nguyen
- , Van Hiep Vuong
- & Nam Nhat Hoang
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Article
| Open AccessPredicting orientation-dependent plastic susceptibility from static structure in amorphous solids via deep learning
Predicting a priori local defects in amorphous materials remains a grand challenge. Here authors combine a rotationally non-invariant structure representation with deep-learning to predict the propensity for shear transformations of amorphous solids for different loading orientations, only given the static structure.
- Zhao Fan
- & Evan Ma
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Article
| Open AccessElectrical switching of high-performance bioinspired nanocellulose nanocomposites
Switching mechanical properties in stiff bioinspired nanocomposites is challenging as they contain high fractions of hard reinforcements. Here, the authors demonstrate reversible electrical switching in highly-reinforced cellulose nanopapers using an applied low direct current.
- Dejin Jiao
- , Francisco Lossada
- & Andreas Walther
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Article
| Open AccessPhase-enabled metal-organic framework homojunction for highly selective CO2 photoreduction
Homojunctions are very promising in photocatalysis, but challenging to achieve. Herein, authors report a well-defined hierarchical metal–organic framework-based homojunction, formed via a one-pot synthesis route directed by hollow transition metal nanoparticles, as photocatalysts for CO2 reduction.
- Yannan Liu
- , Chuanshuang Chen
- & Dongling Ma
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| Open AccessDeciphering the interactions between single arm dislocation sources and coherent twin boundary in nickel bi-crystal
Interactions of dislocations with coherent twin boundaries contribute to strength and ductility in metals, but investigating the interaction mechanisms is challenging. Here the authors unravel these mechanisms through quantitative in-situ transmission electron microscopy observations in nickel bi-crystal samples under tensile loading.
- Vahid Samaee
- , Maxime Dupraz
- & Hosni Idrissi
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Article
| Open AccessUnusual solute segregation phenomenon in coherent twin boundaries
Segregation of solute atoms at interfaces affects the properties of alloys and needs to be understood to allow their rational design. Here the authors report an unusual solute segregation phenomenon in a group of Mg alloys, driven by chemical bonding, where solute atoms larger than Mg segregate to compression sites of specific fully coherent twin boundary.
- Cong He
- , Zhiqiao Li
- & Jian-Feng Nie
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| Open AccessDefect-driven selective metal oxidation at atomic scale
Crystal defects critically influence surface chemical reactions in nanomaterials, yet the basic mechanisms at play are still elusive. Here, the authors show the atomic-scale dynamics of surface oxidation at coherent planar defects in Ag and Pd, revealing how twins and stacking-faults selectively oxidize metallic nanocrystals.
- Qi Zhu
- , Zhiliang Pan
- & Jiangwei Wang
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| Open AccessMechanisms for <100> interstitial dislocation loops to diffuse in BCC iron
The mobility of dislocation loops in materials is of key importance to understanding their deformation behavior. Here the authors using self-adaptive accelerated molecular dynamics show self-diffusion of <100> interstitial loops in body-centered cubic (BCC) iron by changing its habit plane as also confirmed by transmission electron microscopy (TEM) measurements.
- N. Gao
- , Z. W. Yao
- & F. Gao
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Article
| Open AccessMulti-scale characterisation of a ferroelectric polymer reveals the emergence of a morphological phase transition driven by temperature
Ferroelectric polymeric materials possess intermixture of crystalline and amorphous regions with complex Curie transition. Here, the authors demonstrate that the semi-crystalline morphology of the ferroelectric copolymer of P(VDF-TrFE) strongly affects its Curie transition.
- Jonas Hafner
- , Simone Benaglia
- & Ulrich Schmid
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Article
| Open AccessLearning grain boundary segregation energy spectra in polycrystals
Predicting segregation energies of alloy systems can be challenging even for a single grain boundary. Here the authors propose a machine-learning framework, which maps the local environments on a distribution of segregation energies, to predict segregation energies of alloy elements in polycrystalline materials.
- Malik Wagih
- , Peter M. Larsen
- & Christopher A. Schuh
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Article
| Open AccessUltrahigh strength and ductility in newly developed materials with coherent nanolamellar architectures
Nano-lamellar materials with ultrahigh strengths are highly desirable for technological applications. Here the authors report a nanolamellar architecturing approach by utilizing coherent L12 structures to achieve ultrahigh strength and ductility in Ni-Fe-Co-Cr-Al-Ti multicomponent alloys.
- Lei Fan
- , Tao Yang
- & Chain-Tsuan Liu
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Article
| Open AccessTunable analog thermal material
Thermal metamaterials are able to produce unconventional physical properties. Here, the authors demonstrate a thermal metamaterial with conductivity that can be continuously tuned over a very large range.
- Guoqiang Xu
- , Kaichen Dong
- & Cheng-Wei Qiu
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Article
| Open AccessNanoparticles suppress fluid instabilities in the thermal drawing of ultralong nanowires
Thermal drawing of glass-cladded metal nanowires is limited by fluid instabilities. Hwang et al. show how admixing tungsten carbide nanoparticles to the zinc core of a borosilicate-cladded wire leads to intact fibres over lengths significantly exceeding those of metals with high melting points.
- Injoo Hwang
- , Zeyi Guan
- & Xiaochun Li
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Article
| Open Access3D-printed cellular tips for tuning fork atomic force microscopy in shear mode
The authors investigate 3D-printed tips, based on controlled microstructural architectured materials, as probes for shear-mode atomic force microscopy. They demonstrate that the tailored stiffness and energy-absorbing behaviour of the material are beneficial for improving image quality.
- Liangdong Sun
- , Hongcheng Gu
- & Zhongze Gu
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Article
| Open AccessStrategies for simultaneous strengthening and toughening via nanoscopic intracrystalline defects in a biogenic ceramic
Biominerals are nanocomposites that often incorporate nanoscopic defects such as organic inclusions within the mineral matrix. Here, the authors report on an experimental and computational study into the effects of intracrystalline defects on the intrinsic mechanical behaviour of biominerals.
- Zhifei Deng
- , Hongshun Chen
- & Ling Li
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Article
| Open AccessAnomalous mechanical materials squeezing three-dimensional volume compressibility into one dimension
Anomalous mechanical behaviors provide an opportunity to regulate the functions of materials. Here the authors show that materials with coexisting negative, zero and positive compressibilities can “squeeze” volume compressibility into one direction, and thus stabilize transmission processes under pressure.
- Xingxing Jiang
- , Maxim S. Molokeev
- & Zheshuai Lin
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Article
| Open AccessAn all-natural bioinspired structural material for plastic replacement
It is desirable yet challenging to develop sustainable structural materials to replace petroleum-based plastics. Here, the authors report a facile assembly method for manufacturing high-performance structural materials with a unique combination of high strength, toughness and stiffness.
- Qing-Fang Guan
- , Huai-Bin Yang
- & Shu-Hong Yu
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Article
| Open AccessTraining high-strength aluminum alloys to withstand fatigue
The fatigue performance of high strength aluminum alloys is notoriously poor, leading to design limitations for transportation structures. Here the authors design microstructures to exploit the mechanical energy of fatigue to dynamically heal the microstructural weak points and improve the high cycle fatigue life.
- Qi Zhang
- , Yuman Zhu
- & Christopher Hutchinson
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Article
| Open AccessRepulsion leads to coupled dislocation motion and extended work hardening in bcc metals
Work hardening of tungsten in the thermally activated regime is highly orientation dependent. Here, we show that kink-pair nucleation controlled coupled motion of repulsively oriented screw dislocation pairs occurs and leads to an orientation dependent additional plastic slip on unexpected slip systems.
- K. Srivastava
- , D. Weygand
- & P. Gumbsch