Microstructure and properties evolution of Cu-Ti-Cr-Mg alloy during equal channel angular pressing at room temperature and cryogenic temperature

被引：23
作者：
Wang, Xu [1 ]
Xiao, Zhu [1 ,2 ]
Meng, Xiang-peng [3 ]
Yi, Yu-hang [1 ]
Chen, Lei [1 ]
机构：
[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
[2] Minist Educ, Key Lab Nonferrous Met Mat Sci & Engn, Changsha 410083, Peoples R China
[3] Ningbo Boway Alloy Mat Co Ltd, Ningbo 315135, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2022年 / 927卷
基金：
中国国家自然科学基金;
关键词：
Cu-Ti-Cr-Mg alloy; Equal channel angular pressing; Cryogenic deformation; Twin fragmentation; HIGH-STRENGTH; TEXTURE EVOLUTION; AL; DEFORMATION; EXTRUSION; BEHAVIOR; METALS; ECAP;
D O I：
10.1016/j.jallcom.2022.166940
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
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页数：14
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