Functionally graded NiTi alloy with exceptional strain-hardening effect fabricated by SLM method

SCRIPTA MATERIALIA

卷:188

Article

Yang, Y.¹  Zhan, J. B.¹  Sui, J. B.¹  Li, C. Q.¹  Yang, K.²  Castany, P.³  Gloriant, T.³ 

[1] Guangdong Univ Technol, Sch Electromech Engn, Guangzhou 510006, Peoples R China

[2] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

[3] Univ Rennes, INSA Rennes, CNRS, ISCR UMR 6226, F-35000 Rennes, France

关键词: SLM;    NiTi alloys;    Functionally graded;    Phase transformation;   

DOI  :  10.1016/j.scriptamat.2020.07.019

来源: Elsevier

【 摘 要 】

In this study, we have employed a repetitive laser scanning strategy to fabricate a three-dimensional functionally graded NiTi alloy by SLM method. The microstructure shows gradient characterized by the increase of volume fraction for B19' phase. An exceptional strain-hardening associated with continuous increase of mechanical recoverable strain is obtained in such material. The gradient of functionality is attributed to the superimposition of multi-deformation mechanisms originating from the microstructural gradient. The deformation mechanisms are dominated by reorientation of B19' variants at early stage of deformation and then by stress-induced martensitic transformation at higher level of stress. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free