The effect of γ′-phase dispersed particles on the temperature dependence of the stresses of the start of martensitic transformations σ cr (T), the shape memory effect, and the superelasticity is investigated depending on aging conditions in the [001]-oriented crystals of the non-equiatomic Fe – 28% Ni – 17% Co – 1.5% Al – 2.5% Ti (at.%) high-entropy alloy under tension/compression. It is shown that σ cr (T) during the γ–α′ stressinduced martensitic transformations is independent of the strain method (tension/compression) for small γ′- phase particles with sizes d ≤ 4–6 nm. The value of the reversible strain at tension is 3.5–4.5%, and it is 1.5% at compression. Reasons for strong dependences of the reversible strain and the mechanical hysteresis on the strain method (tension/compression) and particle sizes are discussed.

中文翻译：

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非等原子FeNiCoAlTi高熵合金[001]取向单晶在拉伸和压缩下的超弹性和形状记忆效应

根据[001]取向晶体中的时效条件研究了γ'相分散颗粒对马氏体转变开始应力σcr(T)、形状记忆效应和超弹性的温度依赖性的影响非等原子 Fe – 28% Ni – 17% Co – 1.5% Al – 2.5% Ti (at.%) 在拉伸/压缩下的高熵合金。结果表明，对于尺寸 d ≤ 4-6 nm 的小 γ' 相颗粒，γ-α' 应力诱导马氏体转变过程中的 σ cr (T) 与应变方法（拉伸/压缩）无关。拉伸时的可逆应变值为 3.5-4.5%，压缩时为 1.5%。讨论了可逆应变和机械滞后对应变方法（拉伸/压缩）和粒度的强烈依赖性的原因。