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研究了变形温度、应变速率和变形程度等热加工参数对SiCp2014Al复合材料力学行为和晶粒度的影响。结果表明,该材料的流动应力对变形温度和应变速率比较敏感。变形温度每升高40℃,流动应力降低5～10MPa,应变速率每提高一个数量级,流动应力增加13～18倍。提高应变速率有利于获得细晶组织。以足够的变形程度锻造以及适当提高锻后冷却速度均有利于获得细晶组织。根据实验结果确定了该材料的流动应力与热加工参数之间的函数关系。
The effect of hot working parameters such as deformation temperature, strain rate and degree of deformation on the mechanical behavior and grain size of SiCp2014Al composites was studied. The results show that the flow stress of the material is more sensitive to deformation temperature and strain rate. For each 40 ℃ increase in deformation temperature, the flow stress is reduced by 5 ~ 10MPa. When the strain rate is increased by one order of magnitude, the flow stress increases by 13 ~ 18 times. Increasing the strain rate favors obtaining fine grain structure. Forging with sufficient degree of deformation and the appropriate increase of forging cooling rate are conducive to obtain fine grain structure. Based on the experimental results, the functional relationship between the flow stress and the hot working parameters of the material was determined.