SiC颗粒增强铝合金基复合材料断裂与强化机理

MECHANISMS ON FRACTURE AND STRENGTHENING OF ALUMINIUM ALLOY MATRIX COMPOSITES REINFORCED WITH SiC PARTICLES

对 Si C颗粒增强铝合金基复合材料的室温拉伸断裂与强化机理进行了研究。结果表明 :该类材料的断裂包括基体韧断、界面脱开和增强体颗粒断裂三种方式 ,均属于 MNG模式 ;该类复合材料的强化效果取决于基体强度与界面强度的匹配关系 ,当基体的屈服强度达到某一临界值时 。

The mechanisms of tensile fracture and strengthening of aluminium alloy matrix composites reinforced with SiC particles are examined. The results show that fracture evolution entails a process of microvoid nucleation, growth, coalescence (MNG) for the PRMMCs and there exhibit three models of initial fracture in the process: toughness fracture of the matrix, boundary separation and particle break. Experimental analyses show that strengthening effect of the composites depends on the matching relations between the matrix and the boundary strength and it is very difficult to strengthen the composites when yield stress of the matrix goes beyound a certain critical value.