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对低压浸渗、挤压比为 10∶ 1的热挤压以及固溶处理制备的 Si CW/ Zn- 2 2 Al复合材料的组织与高温变形行为进行了研究。结果表明 :Si CW的复合使材料中出现了熔点为 6 5 5 K的低熔点共晶组织 ,显著提高了变形抗力 ,降低了塑性 ,并使材料丧失了在共析温度区的超塑性 ;在出现适量液相的共晶温度区 ,复合材料具有超塑性
The microstructures and high temperature deformation behavior of Si CW / Zn-2 2 Al composites prepared by low pressure impregnation, hot extrusion with 10: 1 extrusion ratio and solution treatment were studied. The results show that the low melting point eutectic microstructure with a melting point of 6 5 5 K appears in the composite of Si CW, which significantly improves the deformation resistance, reduces the plasticity and loses the superplasticity in the eutectoid temperature region. Occurrence of eutectic temperature range of the right amount of liquid phase, the composite material with superplasticity