Abstract

Uranium-6 wt pct niobium (14 at pct niobium) displays the shape memory effect (SME), where deformation proceeds by twinning and twin rearrangement via boundary migration within the SME regime. In-situ neutron diffraction during deformation suggests that after SME strain is exhausted, deformation proceeds via another twinning mechanism that does not recover to the original parent orientation upon reheating and transformation. Here we show from in-situ tensile and compressive loading and unloading experiments that early post-SME twins partially reverse during unloading, which is evident by rapid texture evolution, and this reversion is responsible for the inelastic portion of the previously reported ~ 2 pct strain recovery.

中文翻译：

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卸载铀6 wt％铌期间形状记忆效应孪晶的还原

摘要

铀6重量pct铌（14 pcb铌）显示出形状记忆效应（SME），其中变形通过孪晶和孪晶重排通过SME制度内的边界迁移而发生。变形过程中的原位中子衍射表明，在SME应变耗尽后，变形会通过另一种孪生机制进行，该机制在重新加热和转变后不会恢复到原始的母体取向。在这里，我们从原位拉伸，压缩加载和卸载实验表明，早期SME双胞胎在卸载过程中会部分反转，这可以通过快速的纹理演变来证明，而这种反转是造成先前报道的〜2 pct应变的非弹性部分的原因复苏。