Functionally graded structures realized based on Fe–Mn–Al–Ni shape memory alloys
Functionally graded structures realized based on Fe–Mn–Al–Ni shape memory alloys
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DOI：
10.1016/j.scriptamat.2020.10.057
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发表时间：
2021-03
影响因子：
6
通讯作者：
M. Vollmer;A. Bauer;M. Kriegel;M. Motylenko;T. Niendorf
中科院分区：
文献类型：
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作者：
M. Vollmer;A. Bauer;M. Kriegel;M. Motylenko;T. Niendorf
本文介绍了一种获得Fe-Mn-Al-Ni形状记忆合金功能梯度性能的新方法。显示超弹性的单晶样品在部分马氏体状态下时效。结果表明，奥氏体时效区域的超弹性迟滞特征发生变化，其正向和反向转变的临界应力不同，而马氏体时效区域的性能基本保持不变。透射电镜研究表明，在马氏体时效区，纳米β析出相的平均尺寸约为9 nm，在奥氏体时效区，纳米β析出相的平均尺寸约为12 nm，对相变温度和最终的相变应力有很大影响。基于这些结果，似乎可以定制Fe-Mn-Al-Ni组件，使其显示局部不同的功能特性。
In the present study a novel approach to obtain functionally graded properties in an Fe–Mn–Al–Ni shape memory alloy is introduced. A single crystalline sample showing superelastic properties was aged in a partially martensitic state. As a result, the area aged in austenite is characterized by a changed superelastic hysteresis with different critical stresses for forward and backward transformation, whereas the properties in the area aged in martensite remained almost unchanged. Transmission electron microscopy studies revealed that the mean average size of nanometric β precipitates, which strongly influence the transformation temperatures and eventually the transformation stresses, is about 9 nm in the area aged in martensite and about 12 nm in the area aged in austenite. Based on these results it seems to be feasible to tailor Fe–Mn–Al–Ni components in a way allowing them to show locally different functional properties.