Abstract In the present study, the temperature dependence of martensite variant reorientation in stress-induced martensite aged at 423 K along the [110]B2||[100]L10-direction Ni49Fe18Ga27Co6 single crystals was investigated in compression. This martensite aging induces a rubber-like behavior with a reversible strain of up to –16.0% along the [001]B2-direction in the temperature range from 248 K to 344 K, which is caused by L10-martensite variant reorientation. At higher temperatures between the forward and reverse transformation from 344 K to 382 K, the stress-induced martensite aged crystals demonstrate a two-stage stress-strain response with a reversible strain of up to –13.5%. The first stage is characterized by low critical stresses of σcr1 ≈ 1 – 15 MPa and an inverse elastocaloric effect (heat absorption) under loading. Superelasticity is observed in the second stage with σcr2 ≥ 100 MPa. In this temperature range, the martensite variant reorientation occurs through reverse and then forward martensitic transformation.

中文翻译：

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应力诱导马氏体时效 Ni49Fe18Ga27Co6 单晶中马氏体变体再取向的温度依赖性

摘要 在本研究中，研究了应力诱导马氏体在 423 K 下沿 [110]B2||[100]L10 方向的 Ni49Fe18Ga27Co6 单晶压缩时马氏体变体再取向的温度依赖性。在 248 K 至 344 K 的温度范围内，这种马氏体时效会导致沿 [001]B2 方向的可逆应变高达 –16.0% 的橡胶样行为，这是由 L10-马氏体变体重新定向引起的。在从 344 K 到 382 K 的正向和反向转变之间的较高温度下，应力诱导马氏体时效晶体表现出两阶段应力应变响应，可逆应变高达 –13.5%。第一阶段的特点是 σcr1 ≈ 1 – 15 MPa 的低临界应力和加载下的逆弹性热效应（吸热）。在第二阶段观察到超弹性，σcr2 ≥ 100 MPa。在此温度范围内，马氏体变体重新定向通过反向然后正向马氏体转变发生。