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运用Bridgman技术制备Cu Cr自生复合材料 ,研究了凝固方法和凝固速率对凝固组织及性能的影响 ,分析了复合材料性能提高的原因。结果表明 :复合材料的组织是由α基体相和分布于α相间的纤维状共晶体复合组成 ,随凝固速率增加 ,各组织生长定向性变好且径向尺寸均得到细化 ;致密、均匀、规整排列的组织减少了横向晶界 ,而复合材料的断裂受共晶增强体的断裂控制 ,使得复合材料的强度、塑性、导电性均高于体积凝固试样 ,使复合材料的综合性能提高。
The effect of solidification method and solidification rate on the microstructure and properties of CuCu composite was studied by using Bridgman technology. The reasons for the improvement of composite properties were analyzed. The results show that the microstructure of the composite is composed of the α matrix phase and the fibrous eutectic phase distributed in the α phase. With the increase of the solidification rate, the orientation of the microstructure is improved and the radial size is refined. The dense, uniform, The regular arrangement reduces the transverse grain boundaries, and the fracture of the composites is controlled by the fracture of the eutectic reinforcement. The strength, plasticity and electrical conductivity of the composites are all higher than that of the volume-coagulated samples, so that the composite properties are improved.