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      Combinatorial search of thermoelastic shape-memory alloys with extremely small hysteresis width.

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          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.

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          Author and article information

          Journal
          Nat Mater
          Nature materials
          1476-1122
          1476-1122
          Apr 2006
          : 5
          : 4
          Affiliations
          [1 ] Materials Analysis and Chemical Science, GE Global Research Center, Niskayuan, New York 12309, USA. cui@crd.ge.com
          Article
          nmat1593
          10.1038/nmat1593
          16518396
          dce78b88-1247-41d6-9ed8-36cf02afe7a8
          History

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