Atomic order and martensitic transformation entropy change in Ni-Co-Mn-In metamagnetic shape memory alloys

被引：28
|
作者：
Perez-Sierra, A. M. [1 ]
Bruno, N. M. [2 ]
Pons, J. [1 ]
Cesari, E. [1 ]
Karaman, I. [2 ,3 ]
机构：
[1] Univ Illes Balears, Dept Fis, E-07122 Palma De Mallorca, Spain
[2] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA
[3] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA
来源：
SCRIPTA MATERIALIA | 2016年 / 110卷
基金：
美国国家科学基金会;
关键词：
Martensitic transformation; Metamagnetic shape memory alloys; Transformation entropy change; Atomic order; PHASE-TRANSFORMATION; HEUSLER ALLOY;
D O I：
10.1016/j.scriptamat.2015.07.047
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The martensitic transformation entropy changes, Delta 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 Delta 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 Delta S-tr. Additional mechanical measurements performed under 1.6 T do not show any notable changes in Delta S-tr. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：61 / 64
页数：4
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