研究等径弯曲通道变形(ECAP)与时效相结合的不同加工工艺对 Cu-0．8Cr-0．15Zr 合金的组织和性能的影响.结果表明,合金经 ECAP 挤压8道次后形成了均匀的等轴晶结构,平均晶粒尺寸为200 nm,时效使得合金组织均匀性进一步提高.室温力学性能和导电性能测试结果显示,合金具有很强的时效强化效应,时效前的冷变形能显著提升合金的性能,合金经ECAP 工艺8道次挤压后420℃时效3 h,合金的硬度、抗拉强度和伸长率分别达到了249．15 Hv,623．1 MPa和12．3％,合金的导电率达到了85．34％IACS.ECAP 过程中合金的强化机制主要是细晶强化,细小弥散分布的析出相对位错的钉扎作用也为合金性能的提升做出了贡献.
The effects of different processing technology combined ECAP(equal channel angular pressing)and aging treatment on microstructure and properties of Cu-0.8Cr-0.15Zr alloy were investigated.The results showed that the microstructure of the alloy after 8 passes of ECAP was consisted of the equiaxed grains,and the average grains sizes were 200 nm,the microstructure uniformity of alloy were improved even more after ag-ing.Tests of mechanical and conductive properties at room temperature showed that the Cu-0.8Cr-0.15Zr alloy has strong aging strengthening effect and cold deformation before aging can greatly improved the properties of the alloy.the alloy that was aged at 420 ℃ for 3 h after eight passes of ECAP has the best comprehensive prop-erties with hardness,tensile strength,elongation and electrical conductivity of 249.15 Hv,623.1 MPa,12.3%and 85.34%IACS.Grain-refining strengthening was dominant strengthening mechanism in ECAPed Cu-0.8Cr-0.15Zr alloy,as well as also the pinning effect of precipitates that the fine chromium and the second phase dis-tributed in matrix on dislocations contribute to the improvement of strength.
参考文献
| [1] | Ivanov AD.;Nikolaev AK.;Kalinin GM.;Rodin ME. .Effect of heat treatments on the properties of CuCrZr alloys[J].Journal of Nuclear Materials: Materials Aspects of Fission and Fusion,2002(Pt.a):673-676. |
| [2] | Zhiqiang Wang;Yunbo Zhong;Guanghui Cao .Influence of dc electric current on the hardness of thermally aged Cu-Cr-Zr alloy[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2009(1/2):303-306. |
| [3] | Batra I S;Dey G K;Kulkarni U D et al.Precipitation in a Cu-Cr-Zr alloy[J].MATERIALS SCIENCE & ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2003,356(1-2):32-36. |
| [4] | Xie Haofeng;Mi Xujun;Huang Guojie.Effects of cold work and aging hardening on microstructure and properties of Cu-Cr-Zr alloy[A].Changsha,2010:414-418. |
| [5] | Tang N Y;Taplin N M;Dunlop G L.Precipitation and aging in high-conductivity Cu-Cr alloys with additions of zirconium and magnesium[J].Materials Science and Technology,1985(01):270-275. |
| [6] | 钟建伟,周海涛,赵仲恺,李庆波,周啸.形变热处理对Cu-Cr-Zr合金时效组织和性能的影响[J].中国有色金属学报,2008(06):1032-1038. |
| [7] | 杜忠泽,冯广海,符寒光,王经涛,赵西成.ECAP变形与材料组织性能控制的研究[J].材料工程,2006(03):64-68. |
| [8] | Segal VM. .MATERIALS PROCESSING BY SIMPLE SHEAR[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1995(2):157-164. |
| [9] | Iwahashi Y;Wang J;Horita Z et al.Principle of equal channel angular pressing of ultra-fine grained materials[J].Scripta Materialia,1996,35(02):143-146. |
| [10] | Mu SG;Guo FA;Tang YQ;Cao XM;Tang MT .Study on microstructure and properties of aged Cu-Cr-Zr-Mg-RE alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):235-240. |
| [11] | Batra IS.;Kulkarni UD.;Banerjee S.;Dey GK. .Microstructure and properties of a Cu-Cr-Zr alloy[J].Journal of Nuclear Materials: Materials Aspects of Fission and Fusion,2001(2):91-100. |
| [12] | Huang Fuxiang;Ma Jusheng;Ning Honglong;Geng Zhiting;Lu Chao;Guop Shumei;Yu Xuetao;Wang Tao;Li Hong;Lou Huafen .Analysis of phases in a Cu-Cr-Zr alloy[J].Scripta materialia,2003(1):97-102. |
| [13] | 陈小波,姜锋,陈蒙,蒋龙,黄祖琼,韦莉莉.固溶时效后高强高导Cu-Cr-Zr合金的性能与显微组织研究[J].宇航学报,2009(04):1680-1685. |
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