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采用原位反应近液相线铸造方法制备4.4%TiCP/7075铝复合材料,在基体合金的液-固两相区间(477~635℃)的600℃分别保温10、20、40、60 min,水淬固定其半固态组织,应用Image Pro Plus软件测量平均晶粒尺寸,研究原位TiCP对二次加热组织的影响。结果表明,原位TiCP不仅使合金铸态组织直接转变为等轴晶组织,而且在二次加热过程中,对晶粒的长大行为具有明显的抑制作用。在相同的二次加热条件下,TiCP/7075铝复合材料的平均晶粒尺寸比7075基体合金减小了30~40μm,更适合于半固态触变成形。
The in-situ reactive near-liquidus casting method was used to prepare 4.4% TiCP / 7075 aluminum composites. The microstructures of TiCP / 7075 aluminum alloy were respectively heat-treated at 600 ℃ for 10, 20, 40 and 60 min in the liquid-solid two-phase region of the matrix alloy (477-635 ℃) The semi-solid structure was fixed by water quenching. The average grain size was measured by Image Pro Plus software to study the effect of in situ TiCP on the secondary heating structure. The results show that in-situ TiCP not only directly changes the as-cast alloy microstructure into equiaxed grains, but also significantly inhibits the grain growth during secondary heating. Under the same secondary heating conditions, the average grain size of TiCP / 7075 aluminum composite is reduced by 30 ~ 40μm compared with 7075 matrix alloy, which is more suitable for semi-solid thixoforming.