Negative Poisson’s ratio in Heusler-type Cu-Al-Mn shape memory alloy
Negative Poisson’s ratio in Heusler-type Cu-Al-Mn shape memory alloy
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Heusler型Cu-Al-Mn形状记忆合金的负泊松比
DOI：
10.1016/j.scriptamat.2019.10.015
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发表时间：
2020
影响因子：
6
通讯作者：
Ryosuke Kainuma
中科院分区：
文献类型：
--
作者：
Sheng Xu;Ryota Tsukuda;Mi Zhao;Xiao Xu;Toshihiro Omori;Kyosuke Yoshimi;Ryosuke Kainuma
负泊松比是指材料在单轴拉伸时沿横向膨胀的现象。在此，我们给出了单晶Heusler型Cu-16.9Al-11.6Mn(at%)形状记忆合金中实验直接观察到的负泊松比，以及该合金的超弹性。当沿[110]方向拉伸时，合金沿[1 1‘0]方向膨胀，表现出显著的负泊松比−0.5 1，而沿[0 0 1]方向收缩，大的正泊松比为1.36。这些实验结果与由弹性常数和弹性各向异性计算得到的值符合得很好。
A negative Poisson's ratio refers to the phenomenon of a material expanding along the transverse direction upon uniaxial tension. Here, we show a negative Poisson's ratio observed directly by experiments in a single-crystal Heusler-type Cu–16.9 Al–11.6 Mn (at%) shape memory alloy, in addition to the alloy's superelasticity. When stretched along the vicinity of the [110] direction, the alloy expands along the [1 1¯ 0] direction, showing a significant negative Poisson's ratio of− 0.51, while shrinking along the [001] direction with a large positive Poisson's ratio of 1.36. These experimental results agree well with the values calculated from the elastic constants and elastic anisotropy.