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High-temperature shape memory alloys based on the RuNb system

机译：基于RuNb体系的高温形状记忆合金

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摘要

Many applications of shape memory alloys (SMAs) require the development of alloys with high martensitic transformation (MT) temperatures. Among the different systems for high temperature SMAs, equiatomic RuNb alloys demonstrate both shape memory effect (SME) and MT temperatures above 800 ℃. This work investigates Ru_(50-x)Nb_(50+x)(at.%) alloys and shows that Nb content significantly affects the MT behavior. Alloys near the equiatomic composition (x = 0, 2,4) undergo two displacive transformations on cooling: β (B2) →β' (body centered tetragonal) →β" (mono-clinic). The Ru_(45)Nb_(55) alloy exhibits a single transition from cubic to tetragonal on cooling. This MT gives rise to a highly twinned microstructure with a (011) compound-twinning mode and is considered to be responsible for the SME in both types of alloys. The reorientation of martensite variants during deformation has been confirmed through scanning electron microscopy of compression specimens. A promising shape memory behavior is obtained through three-point bend tests performed both in the β' and β" phases.
机译：形状记忆合金（SMA）的许多应用要求开发具有高马氏体转变（MT）温度的合金。在用于高温SMA的不同系统中，等原子RuNb合金在800℃以上的温度下均表现出形状记忆效应（SME）和MT温度。这项工作研究了Ru_（50-x）Nb_（50 + x）（at。％）合金，结果表明Nb含量显着影响MT行为。等原子组成附近的合金（x = 0，2,4）在冷却时经历两个置换转变：β（B2）→β'（体心四方）→β“（单斜晶）。Ru_（45）Nb_（55 ）合金在冷却时仅显示出从立方到四方的转变，这种MT产生了具有（011）复合孪晶模式的高度孪生的显微组织，被认为是两种合金中的SME的原因。压缩样品的扫描电子显微镜已证实了变形过程中的变形，通过在β'相和β“相中进行的三点弯曲试验获得了有希望的形状记忆行为。

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