J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (10): 2238-2242.DOI: 10.1016/j.jmst.2019.05.015
• Orginal Article • Previous Articles Next Articles
Zhiwei Xionga1, Zhonghan Lia1, Zhen Suna1, Shijie Haoa*(), Ying Yanga, Meng Lib, Changhui Songc, Ping Qiua, Lishan Cuia
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.
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.
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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