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Effects of Ge addition on the microstructure and thermal stability of Co-V-Si high-temperature shape memory alloys
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)(Grant No. 51571168),The National Key Technologies R&D Program of China (Grant No. 2017YFB0702901)

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    Abstract:

    A study of the Ge substitution for Si in the Co64V16Si20 shape memory alloy was performed in this work. The microstructure, martensitic transformation, thermal cycle stability, microstructural evolution during thermal cycling of the Co64V16Si20-xGex (x = 2, 4, 6, 8, at. %) alloys were studied. When x = 2, the alloy is single D022 martensite. With increasing Ge content to 4 and 6 at. %, two-phase microstructure of (αCo) + D022 martensite was observed. When Ge content is up to 8 at. %, three-phase microstructure of (αCo) + D022 martensite + R phase was observed. The results show that the reversible martensitic transformation temperatures increased by nearly 50°C through adding Ge comparing with that of the Co64V16Si20 matrix alloy. Although the (αCo) or R phases precipitated during thermal cycling process, the reversible martensitic transformation peaks were observed during ten times thermal cycles. It reveals that the Ge addition can improve thermal cycling stability of Co-V-Si high-temperature shape memory alloy.

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[wangcuiping, huanglusheng, zhangyanqing, zhangjinbin, jianghengxing, yangshuiyuan, liuxingjun. Effects of Ge addition on the microstructure and thermal stability of Co-V-Si high-temperature shape memory alloys[J]. Rare Metal Materials and Engineering,2020,49(8):2607~2614.]
DOI:10.12442/j. issn.1002-185X.20190369

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History
  • Received:April 29,2019
  • Revised:July 03,2019
  • Adopted:July 24,2019
  • Online: September 27,2020
  • Published: