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Selective laser melted high Ni content TiNi alloy with superior superelasticity and hardwearing

Journal of Materials Science & Technology 2022年第21期116卷 246-257页

作者： Hui Shen Qingquan Zhang Ying Yang Yang Ren Yanbao Guo Yafeng Yang Zhonghan Li Zhiwei xiong xiangguang Kong Zhihui Zhang Fangmin Guo Lishan Cui Shijie Hao State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China The Key Laboratory of Bionic Engineering(Ministry of Education)and the College of Biological and Agricultural Engineering Jilin UniversityChangchun 130025China Department of Physics City University of Hong KongKowloonHong KongChina College of Mechanical and Transportation Engineering China University of PetroleumBeijing 102249China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

TiNi alloys with high content Ni(52-55 at.%)are perfectly suitable for preparing wear-and corrosionresistant parts that service on the space station,spacecraft,and submarine,because of their superior superelasticity,high strength,and ***,the fabrication of complicated Ni-rich TiNi parts by the traditional machining method often faces problems of poor precision,low efficiency,and high *** this work,we succeed in preparing an excellent Ti_(47)Ni_(53) alloy by selective laser melting(SLM),and thus,open a new way for the efficient and precise formation of complicated Ni-rich TiNi parts with superelasticity and *** optimized processing window for compact parts without defects is *** elaborately fabricated Ti_(47)Ni_(53) alloy exhibited a breaking strain of 11%,a breaking stress of 2.0 GPa,a superelastic strain of 9%,and a better hardwearing than that of casting and quenched Ti_(47)Ni_(53) ***,the microstructure,phase transformation,and deformation,as well as their influence mechanisms are investigated by in situ transmission electron microscope(TEM)and high-energy x-ray diffraction(HE-xRD).The results obtained are of significance for both fundamental research and technological applications of SLM-fabricated high Ni content TiNi alloys.

关键词： Selective laser melting high Ni content TiNi Superelasticity Wear in situ high-energy x-ray diffraction Microstructure

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