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Effect of V Content on Microstructure, Phase Transforma-tion Behavior and Microhardness of Equiatomic NiTi Shape Memory Alloy
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1.Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China;2.College of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, China;3.Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Guangzhou 510650, China

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Guangdong Province Science and Technology Plan Project (2019B090905009); Guangzhou Science and Technology Plan Project (201704030067)

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    Abstract:

    The effect of vanadium (V) content on the microstructure, phase transformation behavior, and microhardness of the as-cast equiatomic NiTi shape memory alloy was investigated by optical microscope (OM), scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and Vickers microhardness tester. Results indicate that the as-cast Ni50-x/2Ti50-x/2Vx alloys with equiaxed grains consist mainly of B19' and Ti2Ni phases when V content is 0.5at%, above which Ni50-x/2Ti50-x/2Vx (x=1.5~3.5, at%) alloys exhibit a three-phase structure consisting of B19', Ti2Ni and V-rich phases, and the V-rich phases are more segregated at grain boundaries with the increase of V content. Further analysis reveals that both Ni49.75Ti49.75V0.5 and Ni49.25Ti49.25V1.5 alloys show a one-stage B2?B19' transformation. However, a two-stage B2?R?B19' transformation occurs in Ni48.75Ti48.75V2.5 and Ni48.25Ti48.25V3.5 alloys although R-phase transformation partially overlaps B19' martensitic transformation upon cooling. The transformation temperatures drop down with increasing the V content, which is attributed to the increase of Ni/Ti ratio in the matrix. In addition, as V element increases from 0.5at% to 3.5at%, the microhardness of the alloys first decreases and then remains almost unchanged.

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[Gan Chunlei, Chen Zhiwei, Li Xiaohui, Zhou Nan, Qian Jianqing, Zheng Kaihong, Li Jilin. Effect of V Content on Microstructure, Phase Transforma-tion Behavior and Microhardness of Equiatomic NiTi Shape Memory Alloy[J]. Rare Metal Materials and Engineering,2021,50(12):4245~4250.]
DOI:10.12442/j. issn.1002-185X. E20210015

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History
  • Received:May 19,2021
  • Revised:June 22,2021
  • Adopted:July 09,2021
  • Online: December 30,2021
  • Published: December 24,2021