Letter | Published:

High-temperature bulk metallic glasses developed by combinatorial methods

Abstract

Since their discovery in 19601, metallic glasses based on a wide range of elements have been developed2. However, the theoretical prediction of glass-forming compositions is challenging and the discovery of alloys with specific properties has so far largely been the result of trial and error3,4,5,6,7,8. Bulk metallic glasses can exhibit strength and elasticity surpassing those of conventional structural alloys9,10,11, but the mechanical properties of these glasses are critically dependent on the glass transition temperature. At temperatures approaching the glass transition, bulk metallic glasses undergo plastic flow, resulting in a substantial decrease in quasi-static strength. Bulk metallic glasses with glass transition temperatures greater than 1,000 kelvin have been developed, but the supercooled liquid region (between the glass transition and the crystallization temperature) is narrow, resulting in very little thermoplastic formability, which limits their practical applicability. Here we report the design of iridium/nickel/tantalum metallic glasses (and others also containing boron) with a glass transition temperature of up to 1,162 kelvin and a supercooled liquid region of 136 kelvin that is wider than that of most existing metallic glasses12. Our Ir–Ni–Ta–(B) glasses exhibit high strength at high temperatures compared to existing alloys: 3.7 gigapascals at 1,000 kelvin9,13. Their glass-forming ability is characterized by a critical casting thickness of three millimetres, suggesting that small-scale components for applications at high temperatures or in harsh environments can readily be obtained by thermoplastic forming14. To identify alloys of interest, we used a simplified combinatorial approach6,7,8 harnessing a previously reported correlation between glass-forming ability and electrical resistivity15,16,17. This method is non-destructive, allowing subsequent testing of a range of physical properties on the same library of samples. The practicality of our design and discovery approach, exemplified by the identification of high-strength, high-temperature bulk metallic glasses, bodes well for enabling the discovery of other glassy alloys with exciting properties.

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The authors declare that the data supporting the findings of this study are included within the paper and available from the corresponding author on reasonable request.

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Acknowledgements

We thank D. Q. Zhao and D. W. Ding for experimental assistance. This work was partly supported by the National Key Research and Development programme of China (grant number 2017YFB0701900), the MOST 973 programme (grant number 2015CB856800), the NSF of China (grant numbers 11790291 and 61888102), the Key Research programme of Frontier Sciences of the Chinese Academy of Sciences (grant number QYZDY-SSW-JSC017) and the Strategic Priority Research programme of the Chinese Academy of Sciences (grant number XDB30000000). J.S. is grateful for support by NSF DMR through award number 1609391 for the combinatorial fabrication and XRD mapping. Y.H.L. acknowledges funding from the National Science Fund for Distinguished Young Scholars of the NSF of China (grant number 51825104), the Hundred Talents programme of the Chinese Academy of Sciences and the National Thousand Young Talents programme of China.

Reviewer information

Nature thanks Chain Tsuan Liu and the other anonymous reviewer(s) for their contribution to the peer review of this work.

Author information

Y.H.L. conceived and led the research. Y.H.L., J.S. and W.-H.W. supervised the project. Y.H.L. and M.-X.L. designed the experiments (with advice from P.W., H.-Y.B., M.W.C., J.S. and W.-H.W.). M.-X.L. conducted the experiments. S.-F.Z. and J.S. carried out combinatorial fabrication, XRD mapping and bending tests. Z.L., A.H. and M.W.C. conducted nanoindentation tests. M.-X.L. and Y.H.L. wrote the manuscript with input and comments from all authors.

Competing interests

The authors declare no competing interests.

Correspondence to YanHui Liu.

Extended data figures and tables

  1. Extended Data Fig. 1 Oxide formation with temperature and time.

    XRD characterizations on the surfaces of annealed BMG disks indicate that the oxide layer is mainly composed of Ta2O5 and NiO.

  2. Extended Data Fig. 2 Morphologies of oxide layer.

    a, b, Cross-section and surface morphology along with corresponding element distribution on disk sample annealed at 1,000 K for 1 min. c, d, Cross-section and surface morphology along with corresponding element distribution on disk sample annealed at 1,000 K for 60 min.

  3. Extended Data Table 1 Concentration of impurities in the Ir33Ni28Ta39 BMG

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About this article

Fig. 1: Design and combinatorial fabrication of Ir–Ni–Ta–(B) bulk metallic glass forming alloy system.
Fig. 2: High-throughput characterizations of Ir–Ni–Ta–(B) bulk metallic glasses.
Fig. 3: Summary of the supercooled liquid region versus the glass transition temperature and the high temperature strength of various alloys.
Fig. 4: Properties of our Ir–Ni–Ta–(B) BMGs.
Extended Data Fig. 1: Oxide formation with temperature and time.
Extended Data Fig. 2: Morphologies of oxide layer.

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