材料科学技术(英文版)2022，Vol.97Issue(2) ：113-122.

Microstructure evolution and mechanical behavior of Ni-rich Ni-Mn-Ga alloys under compressive and tensile stresses

Yue Wang Siyuan Yang Ting Zhou Long Hou Lansong Ba Yves Fautrelle Zhongming Ren Yanyan Zhu Zongbin Li Xi Li
材料科学技术(英文版)2022，Vol.97Issue(2) ：113-122.
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Microstructure evolution and mechanical behavior of Ni-rich Ni-Mn-Ga alloys under compressive and tensile stresses

Yue Wang 1Siyuan Yang 1Ting Zhou 1Long Hou 1Lansong Ba 1Yves Fautrelle 2Zhongming Ren 1Yanyan Zhu 3Zongbin Li 4Xi Li5
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作者信息

  • 1. State Key Laboratory of Advanced Special Steels,Shanghai University,Shanghai 200072,China
  • 2. EPM-Madylam,ENSHMG BP 38402St Martin d'Heres Cedex,France
  • 3. School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China
  • 4. Key Laboratory for Anisotropy and Texture of Materials,Northeastern University,Shenyang 110819,China
  • 5. State Key Laboratory of Advanced Special Steels,Shanghai University,Shanghai 200072,China;Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming,Shanghai Jiao Tong University,Shanghai 200240,China;EPM-Madylam,ENSHMG BP 38402St Martin d'Heres Cedex,France
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Abstract

The microstructure evolution and mechanical behavior in directionally solidified Ni-rich Ni-Mn-Ga alloys with nominal compositions of Ni58Mn25Ga17 and Ni60Mn25Ga15 under compressive and tensile stresses have been investigated.The composition distribution shows the element Ni segregates in gamma phase,while elements Mn and Ga segregate in martensite phase.Furthermore,the microstructure orientation examined by electron backscatter diffraction(EBSD)indicates that beta phase has a preferred growth orientation of(001)A in Ni58Mn25Ga17 alloys,while gamma phase has a preferred growth orientation of(001)γ in Ni60Mn25Ga15 alloys.The fracture morphology suggests that the existence of ductile γ phase can reduce the crack propagation and promote fracture strain,particularly in the Ni60Mn25Ga15 alloys.Fi-nally,Schmid factor and deformation gradient tensor were calculated to well explain the crystallographic evolution during the detwinning under compressive and tensile stresses.The present findings not only elucidate the mechanism of y phase on the mechanical behavior of Ni-rich Ni-Mn-Ga alloys,but also shed light on the composition design of high temperature Ni-Mn-Ga shape memory alloys.

Key words

Ni-Mn-Ga/Gamma phase/Tensile/Compressive/EBSD

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基金项目

国家自然科学基金(51904183)

国家自然科学基金(51690164)

国家自然科学基金(51805321)

Shanghai Science and Technology Committee(19XD1401600)

Shanghai Science and Technology Committee(19010500300)

中国博士后科学基金(2018M640375)

中国博士后科学基金(2019T120330)

出版年

2022
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI
影响因子：0.657
ISSN：1005-0302
参考文献量27
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