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采用粉末冶金工艺制备了一种SiC颗粒体积分数为30%的SiCp/2024Al复合材料,利用扫描电镜(SEM)、透射电镜(TEM)、能谱(EDS)、电子拉伸和硬度等测试方法研究了不同热处理参数对材料微观组织和力学性能的影响。结果表明:当固溶处理温度达到505℃,可溶相充分回溶,仅剩下含量极少的不可溶相残留在基体中,同时复合材料获得较高的强度;人工时效时间超过100 min后,材料的布氏硬度迅速升高,4.5 h达到峰值,到10 h没有明显的过时效引起的硬度下降。棒针状纳米析出相(S’相)弥散分布于基体中提高复合材料的性能。碳化硅颗粒的加入加速了基体合金的时效动力学,但是基体合金的时效析出过程并没有改变。
A composite SiCp / 2024Al with 30% SiC particle size was prepared by powder metallurgy. The microstructure of the SiCp / 2024Al composites was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) Effect of different heat treatment parameters on the microstructure and mechanical properties of the material. The results showed that when the temperature of solution treatment reaches 505 ℃, the soluble phase is fully dissolved, leaving only a very small amount of insoluble phase remaining in the matrix. At the same time, the composites obtain higher strength. When the artificial aging time exceeds 100 min , The Brinell hardness of the material increased rapidly and peaked at 4.5 h, with no obvious decrease of hardness caused by over-aging at 10 h. Rod-shaped nano-precipitated phase (S ’phase) dispersed in the matrix to improve the performance of composite materials. The addition of silicon carbide particles accelerates the aging kinetics of the matrix alloy, but the aging process of the matrix alloy does not change.