热压烧结制备Al_2O_3弥散强化Cu-25%Cr复合材料的微观组织与性能

Microstructure and Properties of Al_2O_3 Dispersion Strengthened Cu- 25%Cr Composite Prepared by Hot-pressed Sintering

对比研究了热压烧结和冷压-烧结工艺制得Al2O3弥散强化Cu-25%Cr复合材料的微观组织与力学、物理性能,并考察了冷变形对其性能的影响。结果表明,采用真空热压烧结工艺制得的Al2O3弥散强化Cu-25%Cr复合材料,硬度达到95HV,电导率达18.3MS·m-1,相对密度可达97.1%;两种方法制备的Cu-Al2O3/Cr复合材料的显微硬度随着变形量的增加而增加,最大增幅均在50%左右,分别达到142HV和131HV;而电导率是先增加后减小。

The microstructure, mechanical properties and physical properties of Al2O3 dispersion strengthened Cu-25% Cr composites prepared by hot-pressed sintering and cold-pressed sintering methods respectively were contrastively studied and the effect of cold deformation on the microstructure, mechanical properties and physical properties was studied as well. The experimental results show that the electrical conductivity, microhardness and relative density of the materials by hot-pressed sintering technology is 18.3 MS · m^-1 , 95 HV and 97. 1% respectively. The microhardness is obviously increased with the deformation, the maximum increment is about 50%, and the maximum values reache 142 HV and 131 HV respectively, Whereas, the electrical conductivity increases firstly and then decreases gradually with increasing the deformation.