| 摘要: |
| 本研究利用多道次等径角挤压工艺制备了超细晶Cu-Cr-Zr合金棒,在450 ℃人工时效4h后,获得最佳综合性能:抗拉强度610 MPa,断裂延伸率12.5%,硬度199 HV,电导率77%IACS。通过EBSD技术和TEM分析,揭示了该工艺条件下合金主要的强化机制:超细晶组织贡献了260.6 MPa,析出相强化贡献了149 MPa,加工硬化效果为163.9 MPa。相比于等径角挤压试样,析出相取代了固溶原子,强化效果显著提高；而位错密度降低,加工硬化效果显著降低。 |
| 关键词: 铜合金 等径角挤压 晶粒细化 力学性能 EBSD |
| DOI：10.11951/j.issn.1005-0299.20190221 |
| 分类号:TG161 |
| 文献标识码:A |
| 基金项目:天津市高等学校科技发展基金计划项目(20130319). |
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| Effect of heat treatment process on microstructure and properties of copper alloy with high strength and good electrical conductivity |
|
YU Han
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(Tianjin Polytechnic College, Tianjin 300400, China)
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| Abstract: |
| In this studay,The ultrafine-grained Cu-Cr-Zr alloy rod was made by multiple equal channel angular pressing (ECAP). After treating it at 450 ℃ for 4 h, the optimal multifunctional property was obtained with tensile strength of 610 MPa, elongation rate of 12.5%, hardness of 199 HV, and electrical conductivity of 77.1% IACS.by EBSD and TEM analysis, the strengthening mechanism of the alloy under this process was revealed: the contribution of the ultrafine structure, precipitation strengthening, and work hardening effect is 260.6 Mpa, 149 MPa, and 163.9 Mpa, respectively. Compared with samples by ECAP, precipitated phase replaced solid solution atoms, and the strengthening effect is significantly improved, while dislocation density decreased and work hardening effect obviously weakened. |
| Key words: Cu alloy ECAP gran refinement mechanical properties EBSD |
