Applications of the directional solidification in magnetic shape memory alloys

4th International Conference on Advances in Solidification Processes

材料科学;物理学

Huang, Y.J.^1 ; Liu, J.^2 ; Hu, Q.D.^1 ; Liu, Q.H.^1 ; Karaman, I.^3,4 ; Li, J.G.^1

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

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

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/117/1/012029/pdf
DOI  :  10.1088/1757-899X/117/1/012029

学科分类：材料科学（综合）

来源: IOP

【 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.