走南闯北曲周人分享 http://blog.sciencenet.cn/u/sfguo 走在生活的路上...

博文

Microstructure and mechanical properties of (CrCoNi)97Al1.5T

已有 2785 次阅读 2020-8-22 16:50 |个人分类:材料科学|系统分类:论文交流

Microstructure and mechanical properties of (CrCoNi)97Al1.5Ti1.5 medium entropy alloy twisted by free-end-torsion at room and cryogenic temperatures



Ning Guoa Yinglong Zhaoa Shiteng Longa Bo Songa Jianjun Hub Bin Ganc Linjiang Chaib Shengfeng Guoa

  • School of Materials and Energy, Southwest University, Chongqing, 400715, China

  • College of Materials Science and Engineering, Chongqing University of Technology, Chongqing, 400054, China

  • Beijing Key Laboratory of Advanced High Temperature Materials, Central Iron and Steel Research Institute, Beijing, 100081, China


Abstract

In this study, the swaged (CrCoNi)97Al1.5Ti1.5 medium entropy alloys (MEAs) were twisted by free-end-torsion at room and liquid nitrogen temperatures. Microstructure in different strained layers of the twisted sample was characterized by combined use of energy dispersive spectroscopy, electron channeling contrast imaging, and electron backscatter diffraction techniques. The microhardness and overall tensile properties of the twisted sample were analyzed. The results show that the MEAs exhibit higher torque and lower torsion angle during low-temperature torsion. The deformation mechanism during torsion is dominated by dislocation slip, and gradient dislocations and lamellar dislocation substructures gradually increasing from core to surface are formed in the twisted samples. The twin content gradually decreases in the surface layer, especially when twisted at room temperature or at liquid nitrogen temperature but with a small torsion angle. The reduction of twins is related to the addition of Al and Ti, the critical shear stress of twinning, and the unique strain state of torsional deformation. The twisted samples have gradient distributions of microhardness. Torsion can effectively improve the tensile strength of the MEAs at the expense of ductility.

    https://doi.org/10.1016/j.msea.2020.140101


    Microstructure and mechanical properties of (CrCoNi)97Al1.5Ti1.5 medium entropy .pdf




    https://wap.sciencenet.cn/blog-4773-1247449.html

    上一篇:Effect of free-end torsion on microstructure and mechanical
    下一篇:Microstructure and electronic structure of Cr2C and Fe2Y
    收藏 IP: 222.178.202.*| 热度|

    0

    该博文允许注册用户评论 请点击登录 评论 (0 个评论)

    数据加载中...

    Archiver|手机版|科学网 ( 京ICP备07017567号-12 )

    GMT+8, 2024-12-14 18:23

    Powered by ScienceNet.cn

    Copyright © 2007- 中国科学报社

    返回顶部