Atomic order and martensitic transformation entropy change in Ni–Co–Mn–In metamagnetic shape memory alloys
Atomic order and martensitic transformation entropy change in Ni–Co–Mn–In metamagnetic shape memory alloys
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DOI：
10.1016/j.scriptamat.2015.07.047
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发表时间：
2016
影响因子：
6
通讯作者：
A. M. Pérez-Sierra;N. Bruno;J. Pons;E. Cesari;I. Karaman
中科院分区：
文献类型：
--
作者：
A. M. Pérez-Sierra;N. Bruno;J. Pons;E. Cesari;I. Karaman
Ni-Co-Mn-In长程L2 1原子有序度不同的应力诱导相变的马氏体相变熵变化Δ S tr遵循单一的温度依赖关系，与理论Bragg-Williams近似一致。原子序对Δ S tr的强烈影响是由于原子序的变化和奥氏体磁化的自然温度依赖性引起的转变温度的较大变化。磁序相关变化的影响对Δ S tr的贡献可以忽略不计。在1.6 T下进行的额外机械测量未显示Δ S tr有任何显著变化。
The martensitic transformation entropy changes, Δ S tr, measured from the stress-induced transformation in Ni–Co–Mn–In crystals with different degrees of long range L2 1 atomic order, follow a single temperature dependence and show good agreement with the theoretical Bragg–Williams approximation. The strong influence of the atomic order on Δ S tr is attributed to the large shift in the transformation temperatures caused by the change in atomic order and the natural temperature dependence of the austenite magnetization. The effects of associated changes in magnetic order have a negligible contribution to Δ S tr. Additional mechanical measurements performed under 1.6 T do not show any notable changes in Δ S tr.