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

doi:10.1016/j.jmst.2019.05.015

材料科学与技术 ›› 2019, Vol. 35 ›› Issue (10): 2238-2242.DOI: 10.1016/j.jmst.2019.05.015

收稿日期:2019-04-17 修回日期:2019-04-25 接受日期:2019-05-08 出版日期:2019-10-05 发布日期:2019-08-28

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

Zhiwei Xiong^a¹, Zhonghan Li^a¹, Zhen Sun^a¹, Shijie Hao^a^*(), Ying Yang^a, Meng Li^b, Changhui Song^c, Ping Qiu^a, Lishan Cui^a

^aState Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China
^bQian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing, 100094, China
^cSchool of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou, 510641, China

Received:2019-04-17 Revised:2019-04-25 Accepted:2019-05-08 Online:2019-10-05 Published:2019-08-28
Contact: Hao Shijie
About author:¹Dr. Z.W. Xiong, Z.H. Li, and Dr. Z. Sun equally contributed to this work.

摘要/Abstract

Abstract:

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 ($\widetilde{7}$%). Besides, the SLM-NiTi part with complex geometry displays a shape memory recovery of 99% under compressive deformation of 50%.

Key words: NiTi shape memory alloy, Selective laser melting, Tensile ductility, Shape memory effect

. [J]. 材料科学与技术, 2019, 35(10): 2238-2242.

Zhiwei Xiong, Zhonghan Li, Zhen Sun, Shijie Hao, Ying Yang, Meng Li, Changhui Song, Ping Qiu, Lishan Cui. Selective laser melting of NiTi alloy with superior tensile property and shape memory effect[J]. J. Mater. Sci. Technol., 2019, 35(10): 2238-2242.

图/表 5

Fig. 1. (a) The stripe rotation scanning strategy with stripe width of 4 mm and hatch rotation θ = 67°. The laser goes through “Black Regions” (black arrows) first and then “White Regions” (red arrows) in each layer. (b) The SLM-produced lath-shaped NiTi samples built on NiTi substrate. (c) DSC graph of the SLM-NiTi. (d) XRD pattern of the SLM-NiTi after cooled in liquid nitrogen.

Fig. 2. Tensile deformation behavior of the SLM-NiTi. (a) Tensile stress-strain curve at RT. (b) Comparison of tensile fracture strength and fracture strain between our work and reported SLM-produced NiTi [10,20,21].

Fig. 3. (a)-(c) SEM secondary electron micrographs of the SLM-NiTi from top view, side view and front view, respectively. The inserts are the micro-defects in magnified view.

Fig. 4. (a) Etched optical micrographs of the SLM-NiTi in side view. (b) Schematic diagram of microstructures in the partial area. The yellow dotted line represents the molten pool boundary; red dotted lines represent the radial grain boundary in a molten pool; the blue line represents the flexural zigzag grain boundary throughout multilayers. (c) Etched optical micrographs of the cracks upon tension.

Fig. 5. (a) Stress-Strain-Temperature curves obtained by tensile loading-unloading-heating process of the SLM-NiTi. (b) Shape recovery rate as a function of tensile pre-deformation. (c) The initial shape of printed SLM-NiTi part. (d) The compressed SLM-NiTi part with deformation of 50%. (e) The recovered shape of the SLM-NiTi part after heating.

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

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