摘要
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200nm,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3h,合金的硬度、抗拉强度和伸长率分别达到了249.15 Hv,623.1MPa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.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2014年第7期7116-7119,7124,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51104113)
