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用两种方式等径弯曲通道变形(equal-channel angular pressing,简称ECAP)制备了的具有等轴晶组织的超细晶Cu-0.4Cr合金,晶粒尺寸为500nm。研究了不同挤压方式、不同挤压道次合金的组织和性能的变化。探讨了不同退火温度对5～8道次材料导电率和硬度的影响。结果表明,经ECAP挤压后的Cu-0.4Cr合金具有很好的综合性能,拉伸强度可达565MPa;硬度和导电率分别为225 HV和66.4%IACS;723K退火1h后材料的导电率和硬度可达80.3%IACS和210.9HV;软化温度可达723K。
The ultrafine grained Cu-0.4Cr alloy with equiaxed grain structure was prepared by two methods of equal-channel angular pressing (ECAP). The grain size was 500nm. The microstructures and properties of the alloy under different extrusion conditions and different extrusion passes were studied. The effects of different annealing temperature on the electrical conductivity and hardness of 5 ~ 8 pass materials were discussed. The results show that the Cu-0.4Cr alloy extruded by ECAP has good comprehensive properties, tensile strength up to 565MPa; hardness and electrical conductivity were 225 HV and 66.4% IACS; 723K annealed 1h after the material conductivity and Hardness up to 80.3% IACS and 210.9HV; softening temperature up to 723K.