Article abstract
Nature Materials 5, 286 - 290 (2006)
doi:10.1038/nmat1593
Subject Categories: Metals and alloys | Structural materials | Mechanical properties
Combinatorial search of thermoelastic shape-memory alloys with extremely small hysteresis width
Jun Cui1,2, Yong S. Chu3, Olugbenga O. Famodu2, Yasubumi Furuya4, Jae. Hattrick-Simpers2, Richard D. James5, Alfred Ludwig6,7, Sigurd Thienhaus6,7, Manfred Wuttig2, Zhiyong Zhang5 and Ichiro Takeuchi2,8
Abstract
Reversibility of structural phase transformations has profound technological implications in a wide range of applications from fatigue life in shape-memory alloys (SMAs) to magnetism in multiferroic oxides. The geometric nonlinear theory of martensite universally applicable to all structural transitions has been developed. It predicts the reversibility of the transitions as manifested in the hysteresis behaviour based solely on crystal symmetry and geometric compatibilities between phases. In this article, we report on the verification of the theory using the high-throughput approach. The thin-film composition-spread technique was devised to rapidly map the lattice parameters and the thermal hysteresis of ternary alloy systems. A clear relationship between the hysteresis and the middle eigenvalue of the transformation stretch tensor as predicted by the theory was observed for the first time. We have also identified a new composition region of titanium-rich SMAs with potential for improved control of SMA properties.
- Materials Analysis and Chemical Science, GE Global Research Center, Niskayuan, New York 12309, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Intelligent Machines and Systems Engineering, Hirosaki University, Hirosaki 036-8561, Japan
- Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, Minnesota 55455, USA
- Caesar Research Center, Ludwig-Erhard-Allee 2, 53175 Bonn, Germany
- Institut fur Werkstoffe, Ruhr-Universitat Bochum, 44780 Bochum, Germany
- Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742, USA
Correspondence to: Jun Cui1,2 e-mail: cui@crd.ge.com
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