Comparison of microstructural characteristics, phase transformation and wear behavior of Ni50.8Ti49.2 shape memory alloy fabricated by LPBF versus conventional casting

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL Intermetallics Pub Date : 2025-03-17 DOI:10.1016/j.intermet.2025.108694

Zhenze Liu , Lunxiang Li , Yong Li , Liangtian Tang , Chunling Mao , Hu Xiao , Kongyuan Yang , Panpan Li , Ping Liang , Zhenglei Yu

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引用次数: 0

Abstract

This study investigates the microstructural, phase transformation behavior, mechanical, and wear resistance of Ni_50.8Ti_49.2 shape memory alloys (SMAs) produced through Laser-Powder Bed Fusion (LPBF) techniques compared to conventional casting. It was found that LPBF-NiTi alloy exhibited a reduced grain size and a notably increased phase transformation temperature, accompanied by a latent heat of transformation that is twice as high as that observed in NiTi ingots. LPBF-NiTi alloy exhibits better corrosion resistance and superior wear compared to NiTi ingots. The wear volume of LPBF-NiTi samples was quantitatively assessed to be 27.7 % inferior to that of NiTi ingot. The repeated thermal cycling during LPBF causes Ni evaporation in NiTi phase, reducing critical stress for martensitic transformation. LPBF-NiTi sample is highly susceptible to martensitic transformation under the same contact load. Moreover, smaller grain sizes, a higher relative density of dislocations, and the lattice distortions and strain fields induced by Ti₄Ni₂O_x precipitates significantly enhance the strength of LPBF-NiTi samples. This research offers theoretical insights for the practical application of LPBF-NiTi alloy in manufacturing wear-resistant components with complex geometries for engineering purposes.

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.