Abstract

Stress–strain diagrams (σ–ε curves) have been studied during uniaxial compression of Ni₄₉Fe₁₈Ga₂₇Co₆ alloy single crystals in the [011] axis direction for the initial samples and those after 15-min annealing at 1373 K with subsequent quenching in water. It was established that the σ–ε curves of initial crystals exhibited a one-stage character and showed a single stress decay, whereas the curves of heat-treated and quenched crystals displayed two stress decays. The shape-memory (SM) strain recovery on heating the compression-strained crystals showed an anomalous (burstlike) character. Investigation of the reproducibility of burstlike recovery of SM strain in a series of thermomechanical treatment cycles showed that the recovery took place in quenched crystals, whereas the temperature interval of SM recovery in the initial crystal grew from 1 to 12 K with increasing number of thermomechanical treatment cycles.

中文翻译：

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热处理对在[011]轴方向压缩的Ni 49 Fe 18 Ga 27 Co 6合金晶体变形性能的影响

摘要

在Ni ₄₉ Fe ₁₈ Ga ₂₇ Co ₆单轴压缩过程中研究了应力-应变图（σ-ε曲线）初始样品以及在1373 K退火15分钟后在水中淬火后在[011]轴方向上形成的合金单晶。可以确定，初始晶体的σ–ε曲线表现出一个阶段特征，并且表现出单一的应力衰减，而经热处理和淬火的晶体的曲线表现出两个应力衰减。加热受压应变的晶体时，形状记忆（SM）应变恢复显示出异常（爆发状）特征。在一系列热机械处理循环中，SM应变的突发恢复的可再现性研究表明，恢复发生在淬火晶体中，而随着热机械处理次数的增加，初始晶体中SM恢复的温度间隔从1 K增加到12 K周期。