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利用粉末冶金法制备了WC颗粒体积分数分别为8.0%,11.8%,16.7%的WCp/2024Al复合材料,采用PQ1-6纯弯曲疲劳试验机对其进行高周疲劳性能测试,通过扫描电镜观察复合材料疲劳试验后的疲劳断口。结果表明:WCp/2024Al复合材料疲劳极限和疲劳寿命随着WC体积分数的增加而升高;复合材料的疲劳源产生于试样表面有缺陷或表面附近颗粒团聚的薄弱部位;随着WC体积分数的增加,WCp/2024Al复合材料的疲劳断口韧窝组织呈减少的趋势,脆性断裂特征逐渐明显;由空洞形核与长大造成的界面脱粘和基体相破坏是WCp/2024Al复合材料疲劳断裂的主要形式。
The WCp / 2024Al composites with volume fraction of WC particles of 8.0%, 11.8% and 16.7% were prepared by powder metallurgy method. The high cycle fatigue properties of WCp / 2024Al composites were tested by PQ1-6 pure bending fatigue tester. Fatigue fracture of material after fatigue test. The results show that the fatigue limit and the fatigue life of WCp / 2024Al composites increase with the increase of WC volume fraction. The fatigue source of composites originates from the weak spots on the surface of samples or the agglomeration of particles near the surface. With the increase of WC volume fraction , WCp / 2024Al composites show a decreasing trend in the fracture toughness and brittle fracture. The interfacial debonding and matrix phase failure caused by void nucleation and growth are the result of fatigue fracture of WCp / 2024Al composites the main form.