Abstract

The influence of thermomechanical cycles (compression along the [011] direction and recovery of the shape memory strain upon crystal heating) on the form and characteristics of the compression diagrams of Ni₄₉Fe₁₈Ga₂₇Co₆ alloy crystals not subjected to high-temperature annealing and quenching in water after the growth has been investigated. It is found that these characteristics change during the first nine cycles. Starting from the tenth thermomechanical cycle, they become stable and the deformation properties of the crystals become similar to those of quenched crystals of this alloy. This means that antiphase nanodomains are dispersed by dislocations during the thermomechanical cycling, as a result of which the disordered B₂ crystal structure is transformed into the ordered L2₁ structure, which is characteristic of quenched crystals.

中文翻译：

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用Stepanov方法从熔体中生长出的Ni-Fe-Ga-Co单晶的变形特征

摘要

热机械循环（沿[011]方向压缩和晶体加热时形状记忆应变的恢复）对未经高温处理的Ni ₄₉ Fe ₁₈ Ga ₂₇ Co ₆合金晶体的压缩图的形式和特性的影响已经研究了生长后在水中的退火和淬火。发现这些特性在前九个周期内发生变化。从第十个热机械循环开始，它们变得稳定，并且晶体的变形特性变得类似于该合金的淬火晶体。这意味着在热机械循环过程中，反相纳米域通过位错而分散，其结果是无序B ₂晶体结构转变为有序的L 2 ₁结构，这是淬火晶体的特征。