+高级检索
Ti-55531合金变形及断裂行为的原位SEM分析
作者:
作者单位:

1.贵州大学 材料与冶金学院;2.西安理工大学 材料科学与工程学院;3.西北有色金属研究院

作者简介:

通讯作者:

中图分类号:

基金项目:

国家自然科学基金资助(51471136,51801037), 贵州省科技计划项目(黔科合平台人才[2018]5781号), 贵州省教育厅青年科技人才成长项目(黔教合KY字[2018]104).


In-situ SEM observation to deformation and fracture behavior of Ti-55531 alloy
Author:
Affiliation:

1.College of Materials and Metallurgy,Guizhou University;2.Northwest Institute for Nonferrous Metal Research,Xi’an

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    采用原位SEM拉伸对比分析了高强韧Ti-55531合金片层和双态组织静载下的变形及断裂行为。结果表明,静载下α相的特征参数对该合金的形变、裂纹萌生及扩展有强烈影响。片层组织中粗大次生αs片较软,αs片最先变形促进位错滑移,位错运动至次生αs和残留βr的界面处堆积,塑性变形导致局部应力集中促进裂纹萌生,并沿αsr相界面扩展。双态组织中初生等轴αp是相对最软相且尺寸较大,位错滑移自由程较大,容易启动多系滑移,αp内不同位向的滑移线交割促进应力集中,部分位错在αptrans界面处堆积产生应力集中,两者导致微裂纹萌生于αp内及αptrans界面,并沿αptrans界面和αp聚集处扩展。

    Abstract:

    Deformation and fracture behavior of Ti-55531 alloy with lamellar microstructure (LM) and bimodal microstructure (BM) under static loading were analyzed by the in-situ SEM tensile method. The results show that the characteristic parameters of the alpha phase have a strong influence on the deformation, crack initiation and propagation behavior of the alloy under static loading. Dislocation initiated at secondary alpha (αs) interior under pressure, because the thick αs plate is softer than residual beta (βr) lath in LM. Dislocation moves and accumulates at the αsr interphase during deformation, which induces that cracks initiate at and propagate along the αsr interphase during the process of fracture. However, beta transaction microstructure (βtrans) is greatly harder than equiaxed primary α (αp) in BM, moreover, αpwith large size could support longer slip length. Both of above reasons leads to a large number of multi-direction slips initiate at αp during deformation of BM. The intersection of slip lines in different directions promotes stress concentration at αpinner, and some dislocations accumulate at the αptrans interface to produce stress concentration. These behavior results in the initiation of microcracks within αp and the αptrans interface, and propagation along the weak interface of αptrans, or the aggregation site of αp.

    参考文献
    相似文献
    引证文献
引用本文

黄朝文,谭长生,辛社伟,赵永庆,万明攀. Ti-55531合金变形及断裂行为的原位SEM分析[J].稀有金属材料与工程,2020,49(1):331~336.[Huang Chaowen, Tan Chansheng, Xin Shewei, Zhao Yongqing, Wan Mingpan. In-situ SEM observation to deformation and fracture behavior of Ti-55531 alloy[J]. Rare Metal Materials and Engineering,2020,49(1):331~336.]
DOI:10.12442/j. issn.1002-185X.20181262

复制
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2018-12-18
  • 最后修改日期:2019-01-20
  • 录用日期:2019-01-21
  • 在线发布日期: 2020-02-16
  • 出版日期: