About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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2020 Technical Division Student Poster Contest
|
Presentation Title |
SPG-75: Negative Poisson’s Ratio in Heusler-type Cu-Al-Mn-based Shape Memory Alloys |
Author(s) |
Sheng Xu, Ryota Tsukuda, Mi Zhao, Xiao Xu, Toshihiro Omori, Kyosuke Yoshimi, Ryosuke Kainuma |
On-Site Speaker (Planned) |
Sheng Xu |
Abstract Scope |
A negative Poisson's ratio refers to the phenomenon of materials expanding along the transverse direction upon uniaxial tension or compression. In this study, the Poisson’s ratio was investigated in Heusler-type Cu-Al-Mn-based shape memory alloys. In a Cu-16.9Al-11.6Mn (at%) β-phase single crystal prepared by abnormal grain growth, when stretched along the vicinity of the [110] direction, the sample expands along the [1-10] direction, showing a negative Poisson's ratio of -0.51, while shrinking along the [001] direction with a large positive Poisson's ratio of 1.36. These experiment results agree well with the values calculated from the elastic constants and elastic anisotropy. Moreover, the negative Poisson’s ratio can also be obtained in polycrystalline Cu-Al-Mn-Ni sheet samples by texture control through optimized thermo-mechanical treatments. The negative Poisson’s ratio, together with the superelasticity, enables the Cu-Al-Mn-based shape memory alloys to be promising candidates for novel applications, such as multi-switch mechanical diodes. |
Proceedings Inclusion? |
Undecided |