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研究了等径角挤压层状复合材料的微观组织、扩散和机械结合行为以及显微硬度分布。在室温和高温(300°C)下采用1～4道次等径角挤压工艺制备Al-Cu和Cu-Ni层状复合材料。扫描电镜微观结构表征及抗剪强度试验结果表明,由于在等径角挤压过程中具有更高的塑性变形容忍度,4道次等径角挤压试样层片材料之间的结合强度远远高于1道次样品。此外,剪切强度数据表明,升高等径角挤压温度会使试样的剪切强度显著增加,这主要是由于Al/Cu和Cu/Ni界面在高温下形成了扩散连接。等径角挤压Cu/Ni/Cu复合材料的高温剪切结合强度明显高于等径角挤压Cu/Al/Cu复合材料。
The microstructure, diffusion, mechanical bonding behavior and microhardness distribution of ECAP were investigated. Al-Cu and Cu-Ni layered composites were prepared by one to four passes of equal-angular-angle extrusion at room temperature and elevated temperature (300 ° C). The results of scanning electron microscopy (SEM) and shear strength test show that the bond strength between 4 times of ECAP specimens is much lower due to the higher plastic deformation tolerance Much higher than 1 pass sample. In addition, the shear strength data indicate that increasing the isopipe temperature significantly increases the shear strength of the sample, mainly due to the diffusion bonding formed at the Al / Cu and Cu / Ni interfaces at elevated temperatures. The shear bond strength at high temperature of Cu / Ni / Cu composites with isobaric angle extrusion is significantly higher than that of Cu / Al / Cu composites extruded with isobaric angle.