Abstract We tailor the temperature dependence of elastic modulus (TDEM) of polycrystalline NiTi plates by cold rolling up to 60% thickness reduction. In-plane Elinvar property is obtained with a low elastic modulus temperature coefficient of 6.0 × 10−5 K−1 over a temperature range of 192 K. The microstructure mainly consists of approximately equal volume fractions of {111} -oriented B2 and {102} -oriented B19′ nanocrystals of high thermal stability due to defect pinning and grain refinement. The opposite TDEMs of the two phases can compensate each other and cause the Elinvar behavior. Such mechanism can also be used to obtain Elinvar property for other shape memory alloys.

中文翻译：

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冷轧NiTi合金的Elinvar性能

摘要 我们通过冷轧达到 60% 的厚度减少来定制多晶 NiTi 板的弹性模量 (TDEM) 的温度依赖性。在 192 K 的温度范围内，以 6.0 × 10-5 K-1 的低弹性模量温度系数获得面内 Elinvar 性能。微观结构主要由大约相等体积分数的 {111} 取向 B2 和 {102 } 由于缺陷钉扎和晶粒细化，具有高热稳定性的取向 B19' 纳米晶体。两相的相反 TDEM 可以相互补偿并导致 Elinvar 行为。这种机制也可用于获得其他形状记忆合金的 Elinvar 性能。