Temperature dependence of twinning and magnetic stresses in Ni46Mn24Ga22Co4Cu4 alloy with giant 12% magnetic field-induced strain

被引：32

作者：

Sozinov, A. ^{[1
]}

Soroka, A. ^{[1
]}

Lanska, N. ^{[1
]}

Rames, M. ^{[2
]}

Straka, L. ^{[2
]}

Ullakko, K. ^{[1
]}

机构：

[1] Lappeenranta Univ Technol, Phys Mat Lab, Laitaatsillantie 3, FI-57170 Savonlinna, Finland

[2] Acad Sci Czech Republ, Inst Phys, Na Slovance 1999-2, CZ-18221 Prague, Czech Republic

来源：

SCRIPTA MATERIALIA | 2017年 / 131卷

基金：

芬兰科学院;

关键词：

Heusler phases; Ferromagnetic shape memory alloy; Twinning; Magnetic anisotropy; Magnetic shape memory; NI-MN-GA; SHAPE-MEMORY ALLOYS; CRYSTAL-STRUCTURE; SINGLE-CRYSTALS; MARTENSITIC PHASES; MAGNETOSTRAIN; ANISOTROPY; BEHAVIOR; MOTION; MODEL;

D O I：

10.1016/j.scriptamat.2016.12.032

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We study magnetic shape memory alloy Ni(46)Mn(24)Ga2(2)Co(4)Cu(4) showing up to 12% magnetic field-induced strain (MFIS). The MFIS is mediated by motion of the compound twin boundaries (CTBs) in non-modulated tetragonal crystal lattice. We present temperature dependences of the twinning stress sigma (TW)(T), tetragonality ratio, and magnetic anisotropy energy density K-u(T), used for magnetic stress sigma(mAG)(T) calculations. With temperature increasing, the twinning stress for CTBs decreases with the slope of -0.02 MPa/K, twice slower than observed for type I twin boundaries in 10M Ni-Mn-Ga martensite. We found and explained existence of temperature window, within which the giant MFIS is observed. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：33 / 36

页数：4

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