Observation of Atomic-Order Engineered Martensitic Transformation in Ni45Co5Mn37In13 Metamagnetic Shape Memory Alloys,Advanced Engineering Materials

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Observation of Atomic-Order Engineered Martensitic Transformation in Ni45Co5Mn37In13 Metamagnetic Shape Memory Alloys
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2021-09-02 , DOI: 10.1002/adem.202100711
Huali Yang _{1,

2} , Yali Xie _{1,

2} , Haichen Wu ₃ , Run-Wei Li _{1,

2}

Affiliation

Engineering the martensite–austenite transformation interval (ΔT _i) is important for optimizing the functionalities of metamagnetic shape memory alloys. Although it has been revealed that both doping and thermal annealing can influence ΔT _i, the underlying mechanisms remain largely unexplored. Herein, a direct observation of the martensitic transformation process in Ni₄₅Co₅Mn₃₇In₁₃ alloys with distinct ΔT _is is made. In contrast to the typical burst-like martensitic transition, it is revealed that the alloy with a large ΔT _i exhibits discretely distributed martensitic and austenite phases that evolve slowly with varying temperature. The unusual properties are found to be mainly correlated with atomic disorder rather than lattice distortions. The results indicate the great potential of atomistic engineering in manipulating the martensitic transformation for applications.

中文翻译：

Ni45Co5Mn37In13 异磁形状记忆合金中原子级工程马氏体相变的观察

设计马氏体-奥氏体转变区间 ( ΔT _i ) 对于优化超磁性形状记忆合金的功能很重要。尽管已经发现掺杂和热退火都会影响ΔT _i，但其基本机制仍然很大程度上未被探索。在此，直接观察了具有明显ΔT _i s 的Ni ₄₅ Co ₅ Mn ₃₇ In ₁₃合金中的马氏体转变过程。与典型的突发状马氏体转变相比，揭示了具有大ΔT _i的合金表现出离散分布的马氏体和奥氏体相，随着温度的变化缓慢演化。发现这些不寻常的特性主要与原子无序而不是晶格畸变有关。结果表明原子工程在操纵马氏体转变的应用方面具有巨大潜力。

更新日期：2021-09-02

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