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利用扫描电镜(SEM)、透射电镜(TEM)和示差扫描量热法(DSC)研究了4.4%TiCp/7075Al基复合材料的二次加热组织演变规律及其影响因素.结果表明:4.4%TiCp/7075Al基复合材料的最佳二次加热工艺参数是加热温度为590～610℃,保温时间为10～20min;4.4%TiCp/7075Al基复合材料在二次加热过程中具有较高的稳定性,随温度的升高和保温时间的延长,球形晶粒尺寸增加较小;4.4%TiCp/7075Al基复合材料在600℃时的晶粒粗化速率常数为118.96μm3.s-1,远小于7075基体合金的晶粒粗化速率常数311.7μm3.s-1,更加适宜于半固态触变成形.
The microstructure evolution of 4.4% TiCp / 7075Al matrix composite and its influencing factors were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) .The results showed that 4.4% TiCp / The optimum secondary heating process parameters of 7075Al-based composite are heating temperature of 590 ~ 610 ℃ and holding time of 10 ~ 20min. 4.4% TiCp / 7075Al matrix composites have higher stability during secondary heating, The increase of temperature and holding time prolonged the increase of spherical grain size. The grain coarsening rate constant of 4.4% TiCp / 7075Al matrix composites at 600 ℃ was 118.96μm3.s-1, much less than that of 7075 matrix alloy Of the grain coarsening rate constant 311.7μm3.s-1, more suitable for semi-solid thixoforming.