Applications of the directional solidification in magnetic shape memory alloys

[摘要] A zone melting liquid metal cooling (ZMLMC) method of directional solidification was applied to prepare highly-oriented Ni52Fe17Ga27Co4magnetic shape memory alloys. At high temperature gradient and low growth velocity, the well-developed preferred orientation for coarse columnar crystals was obtained. Such a structure leads to a large complete pseudoelastic recovery of 5% at 348 K. Moreover, the pseudoelastic behaviours and the kinetics of the martensitic transformation (MT) are significantly affected by the intersection angle between the loading direction and the grain boundaries.

[发布机构] School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai; 200240, China^1;Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, CAS, Ningbo; 315201, China^2;Department of Mechanical Engineering, Texas AandM University, College Station; TX; 77843, United States^3;Department of Material Science and Engineering, Texas AandM University, College Station; TX; 77843, United States^4

[效力级别] 物理学 [学科分类] 材料科学（综合）

[关键词] Columnar crystals;Growth velocity;High temperature gradient;Intersection angles;Liquid metal cooling;Loading direction;Magnetic shape memory alloys;Preferred orientations