Selective laser melting of NiTi alloy with superior tensile property and shape memory effect

被引：150

作者：

Xiong, Zhiwei ^{[1
]}

Li, Zhonghan ^{[1
]}

Sun, Zhen ^{[1
]}

Hao, Shijie ^{[1
]}

Yang, Ying ^{[1
]}

Li, Meng ^{[2
]}

Song, Changhui ^{[3
]}

Qiu, Ping ^{[1
]}

Cui, Lishan ^{[1
]}

机构：

[1] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China

[2] China Acad Space Technol, Qian Xuesen Lab Space Technol, Beijing 100094, Peoples R China

[3] South China Univ Technol, Sch Mech & Automot Engn, Guangzhou 510641, Guangdong, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2019年 / 35卷 / 10期

关键词：

NiTi shape memory alloy; Selective laser melting; Tensile ductility; Shape memory effect; MICROSTRUCTURE; DEFORMATION; BEHAVIOR; FABRICATION;

D O I：

10.1016/j.jmst.2019.05.015

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

It is a challenge to develop complex-shaped NiTi shape memory alloy parts by traditional processing methods, due to the poor machinability of NiTi alloy. It is reported that selective laser melting (SLM) of additive manufacturing could overcome this problem. However, the reported SLM-produced NiTi exhibits poor tensile ductility due to the inner defects and adverse unidirectional columnar grains from SLM process. In this work, the defect-less SLM-NiTi with nondirective columnar grains was fabricated by optimizing the intraformational laser scanning length and interformational laser scanning direction. The obtained lath-shaped SLM-NiTi sample exhibits tensile strain of 15.6%, more than twice of the reported maximum result ((7) over tilde%). Besides, the SLM-NiTi part with complex geometry displays a shape memory recovery of 99% under compressive deformation of 50%. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：2238 / 2242

页数：5

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