Effects of cyclic heat treatment and aging on superelasticity in oligocrystalline Fe-Mn-Al-Ni shape memory alloy wires

SCRIPTA MATERIALIA

卷:134

Article

Ozcan, H.¹  Ma, Ji²  Wang, S. J.²  Karaman, I.^1,2  Chumlyakov, Y.³  Brown, J.⁴  Noebe, R. D.⁵ 

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

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

[3] Siberian Phys Tech Inst, Tomsk 634050, Russia

[4] Dynalloy Inc, Costa Mesa, CA USA

[5] NASA, Glenn Res Ctr, Cleveland, OH USA

关键词: Superelastidty;    Martensitic transformation;    Iron-based shape memory alloys;    Stress induced martensite;    Grain growth;   

DOI  :  10.1016/j.scriptamat.2017.02.023

来源: Elsevier

【 摘 要 】

The effects of nano-precipitation on stress-induced martensitic transformation (SIM) in Fe43.5Mn34Al15Ni7.5 shape memory alloy wires were investigated. It was shown that a large grain size to wire diameter ratio, i.e. an oligocrystalline structure, is necessary to obtain superelasticity. The critical stress for SIM and tensile strength at room temperature increase with aging time at 200 degrees C without loss of superelasticity. A superelastic strain of 6.7%, with tunable transformation stress level as high as 600 MPa, and a low stress hysteresis, was obtained in the aged wires. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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