Effect of grain size on the superelastic response of a FeMnAlNi polycrystalline shape memory alloy

SCRIPTA MATERIALIA

卷:125

Article

Tseng, L. W.¹  Ma, Ji²  Vollmer, M.³  Krooss, P.³  Niendorf, T.³  Karaman, I.^1,2 

[1] Texas A&M Univ, Dept Mech Engn, MS 3123, College Stn, TX 77843 USA

[2] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA

[3] Univ Kassel, Inst Werkstofftech Mat Engn, D-34125 Kassel, Germany

关键词: FeMnAlNi;    Fe-based shape memory alloys;    Superelasticity;    Abnormal grain growth;    Microstructure;   

DOI  :  10.1016/j.scriptamat.2016.07.036

来源: Elsevier

【 摘 要 】

The effect of heat treatments on superelasticity was investigated in a FeMnAlNi polycrystalline alloy using incremental tensile strain tests at room temperature. Large grains of more than several millimeters can be obtained by a cyclic heat treatment process and the average grain size can be controlled by the number of heat treatment cycles. Improved superelastic response is observed in samples with large relative grain sizes, exhibiting increased elongation to fracture, lower critical stress for transformation, and higher reversibility. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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