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对Al2O3sf·SiCp/Al复合材料进行高温及半固态区间压缩变形,观察其微观组织和组成,研究了在高温及半固态温度下的压缩变形力学行为和变形机制.Al2O3sf·SiCp/Al复合材料的流动应力随着压缩温度的提高而下降,随着增强体的体积分数、基体材料强度和应变速率的提高而上升.高温压缩使材料屈服后,由于动态回复抵消了材料的加工硬化,其流动应力值基本上保持不变.在半固态温度区间压缩而液相体积分数较低时,其流动应力的变化规律与高温压缩时相似;液相体积分数较高时,流动应力在材料屈服以后,液相的流出使流动应力下降;液相被挤出到侧表面后,流动应力呈上升趋势.复合材料在半固态区间压缩时具有应变速率敏感性.
The deformation and deformation mechanism of Al2O3sf · SiCp / Al composite under high temperature and semi-solid state were observed and the microstructure and composition of Al2O3sf · SiCp / Al composite were investigated. The flow stress decreases with the increase of the compression temperature and increases with the increase of the volume fraction of the reinforcement and the increase of the strength and strain rate of the matrix.When the material is subjected to high temperature compression, the dynamic stress counteracts the work hardening of the material and its flow stress When the liquid phase volume fraction is low, the change law of the flow stress is similar to that during the high temperature compression. When the liquid phase volume fraction is high, the flow stress after the material yields, the liquid The flow stress decreases when the phase flows out, and the flow stress increases when the liquid phase is squeezed out to the side surface. The composite material has the strain rate sensitivity when it is compressed in the semi-solid state.