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对碳化硅颗粒增强铝基复合材料进行等通道挤扭实验和模拟,研究粉体在变形过程中的致密行为。结果表明,SiCp/Al复合粉末材料在等通道转角挤扭工艺中通过3个剪切面和7个变形区能得到有效致密。ECAPT过程中材料所处的球应力和切应力的叠加状态,是材料孔隙得到有效致密的关键。变形过程中,SiC颗粒被剪切细化,促进了团簇颗粒的分散和孔隙的致密。TE通道的剪切作用能使SiC颗粒进一步细化,但材料的整体致密度略有下降。
The SiC particles reinforced aluminum matrix composites were subjected to isostatic squeezing experiments and simulations to study the compact behavior of powders during deformation. The results show that the SiCp / Al composite powder can be effectively densified through three shear planes and seven deformation zones in the isotropic coring process. ECAPT process where the ball material under the stress and shear stress superimposed state, the material is the key to effective compact pores. During deformation, the SiC particles are sheared and refined, which promotes the dispersion of the cluster particles and the compactness of the pores. The shear of TE channel can further refine the SiC particles, but the overall density of the material decreases slightly.