等径角挤压结合形变热处理实现时效强化铜合金获得超高强度及导电率提升
Ultrahigh strength and improved electrical conductivity in an aging strengthened copper alloy processed by combination of equal channel angular pressing and thermomechanical treatment
王旭 1李周 1孟祥鹏 2肖柱3
作者信息
- 1. School of Materials Science and Engineering,Central South University,Changsha 410083,China
- 2. Ningbo Boway Alloy Material Co.,Ltd.,Ningbo 315135,China
- 3. School of Materials Science and Engineering,Central South University,Changsha 410083,China;Key Laboratory of Non-ferrous Metal Materials Science and Engineering(Ministry of Education),Changsha 410083,China
- 折叠
摘要
本文采用等径角挤压和形变热处理的方法提高时效强化型Cu-Ti-Cr-Mg合金的强度和导电率,并对合金的组织和性能进行了详细的研究.结果表明,经低温等径角挤压和轧制变形的样品在400℃时效后具有良好的综合性能,峰时效和过时效样品的抗拉强度分别为1120 MPa和940 MPa,导电率分别为14.7%IACS和22.1%IACS.低温等径角挤压和轧制引入了高密度位错,抑制了变形过程中的软化作用并细化晶粒.经400℃长时间时效后,合金表现出超高强度同时导电率明显提高.合金的超高强度是加工硬化、细晶强化和析出强化协同作用的结果.过时效样品中溶质Ti从基体中大量析出促进了导电率的提升.
Abstract
In this paper,equal channel angular pressing and thermomechanical treatment was employed to improve the strength and electrical conductivity of an aging strengthened Cu-Ti-Cr-Mg alloy,and the microstructure and properties of the alloy were investigated in detail.The results showed that the samples deformed by the combination of cryogenic equal channel angular pressing(ECAP)and rolling had good comprehensive properties after aging at 400℃.The tensile strength of the peak-aged and over-aged samples was 1120 MPa and 940 MPa,with their corresponding electrical conductivity of 14.7%IACS and 22.1%IACS,respectively.ECAP and cryogenic rolling introduced high density dislocations,leading to the inhibition of the softening effects and refinement of the grains.After a long time aging at 400℃,the alloy exhibited ultra-high strength with obvious increasing electrical conductivity.The high strength was attributed to the synergistic effect of work hardening,grain refinement strengthening and precipitation strengthening.The precipitation of a large amount of Ti atoms from the matrix led to the high electrical conductivity of the over-aged sample.
关键词
铜钛合金/等径角挤压/轧制/时效处理/高强度Key words
Cu-Ti alloy/equal channel angular pressing/rolling/aging treatment/high strength引用本文复制引用
基金项目
National Natural Science Foundation of China(U2202255)
Hunan Provincial Natural Science Foundation of China(2024JJ2076)
Key Technology Research Program of Ningbo,China(2023Z092)
出版年
2024
NETL
NSTL
万方数据