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采用熔铸-中间热处理-变形工艺制备了形变Cu-11Cr-0.07Ag原位复合材料,利用扫描电镜、数字微欧计及液晶电子拉力试验机研究了材料的微观组织、力学性能和导电性能。结果表明:随着冷加工变形量的增加,铸态无序分布的Cr枝晶状组织逐渐转为沿线拉方向排列,形成定向排列的Cr纤维,抗拉强度大幅提高,电导率略有下降。经适当冷加工变形和中间热处理后的形变Cu-11Cr-0.07Ag原位复合材料具有较好的强度和电导率匹配。冷加工变形量为8时,其抗拉强度和电导率分别达到851MPa和73.9%IACS。
The deformed Cu-11Cr-0.07Ag in-situ composites were prepared by casting-intermediate heat treatment-deformation process. The microstructure, mechanical properties and electrical conductivity of Cu-11Cr-0.07Ag composites were studied by scanning electron microscopy, digital micro-ohmmeter and liquid crystal electronic tensile testing machine. The results show that as the amount of cold working deformation increases, the disordered Cr dendrites gradually change into the direction of pulling. The oriented Cr fibers are formed. The tensile strength increases sharply and the conductivity decreases slightly. The Cu-11Cr-0.07Ag in-situ composites with proper cold-working deformation and intermediate heat treatment have better strength and conductivity matching. Cold deformation of 8, the tensile strength and electrical conductivity were 851MPa and 73.9% IACS.