Effects of crystallographic orientation on the superelastic response of FeMnAlNi single crystals

SCRIPTA MATERIALIA

卷:116

Article

Tseng, L. W.¹  Ma, Ji²  Wang, S. J.²  Karaman, I.^1,2  Chumlyakov, Y. I.³ 

[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 77843 USA

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

关键词: FeMnAlNi;    Superelasticity;    Single crystals;    Martensite variants;    Iron-based shape memory alloys;   

DOI  :  10.1016/j.scriptamat.2016.01.032

来源: Elsevier

【 摘 要 】

The effects of crystal orientation on the tensile superelastic response of the Fe43.5Mn34Al15Ni7.5 single crystalline shape memory alloy, oriented along the <100> and <123> directions were investigated. The single crystals aged at 200 degrees C for 3 h demonstrated superelastic strains of 3.6% along the <100> orientation and 7.8% along the <123> orientation. Although the theoretical transformation strain in the <100> orientation is higher than that in the <123> orientation, the <123> oriented single crystals demonstrate better superelastic recovery in tension due to a higher number of active martensite variants, which promote better accommodation of internal strains and help minimize defect formation during transformation. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free