Microstructure and properties evolution of Cu-Ti-Cr-Mg alloy during equal channel angular pressing at room temperature and cryogenic temperature
Microstructure and properties evolution of Cu-Ti-Cr-Mg alloy during equal channel angular pressing at room temperature and cryogenic temperature
复制标题
DOI：
10.1016/j.jallcom.2022.166940
复制
发表时间：
2022-09-09
影响因子：
6.2
通讯作者：
Chen, Lei
中科院分区：
文献类型：
--
作者：
Wang, Xu;Xiao, Zhu;Chen, Lei
采用真空中频感应炉制备了Cu-2.5Ti-0.4Cr-0.1Mg（wt%）合金。通过硬度测试、拉伸试验、光学金相观察、X射线衍射和电子背散射衍射等方法，研究了不同温度下等径角挤压（ECAP）变形试样的组织和性能演变规律。在任何给定的ECAP道次下，低温变形（CD）样品的硬度都略高于室温变形（RD）样品。经过8道次ECAP后，CDed和RDed样品的屈服强度彼此接近，分别为812 +/- 17 MPa和793 +/- 25 MPa。ECAP变形由于位错的细分和孪晶的破碎而显著细化了合金的晶粒尺寸，8道次后RD和CD试样的平均晶粒尺寸分别为0.32 μ m和0.37 μ m。计算结果表明，位错强化是提高ECAP试样强度的关键。(c)2022爱思唯尔有限公司版权所有。
A Cu-2.5Ti-0.4Cr-0.1Mg (wt%) alloy was prepared in a vacuum medium frequency induction furnace. The evolution of the microstructure and mechanical properties of the samples deformed by equal channel angular pressing (ECAP) at different temperatures was investigated by hardness tests, tensile tests, optical metallography observation, X-ray diffraction and electron back-scattered diffraction. The cryogenic -tem-perature-deformed (CDed) samples have a little higher hardness than room-temperature-deformed (RDed) samples at any given ECAP pass. After 8 ECAP passes, the yield strength of CDed and RDed samples is close to each other, with the value of 812 +/- 17 MPa and 793 +/- 25 MPa, respectively. ECAP deformation sig-nificantly refines the grain size of the alloy due to the dislocation subdivision and twin fragmentation, and the average grain sizes of RDed and CDed samples after 8 passes are about 0.32 mu m and 0.37 mu m, respec-tively. Calculation results show that dislocation strengthening plays a key role in increasing the strength of ECAPed samples.(c) 2022 Elsevier B.V. All rights reserved.