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探索了莫来石结构硅酸铝短纤维增强的ZL109复合材料(MMC)和ZL109合金在573K的高温低周疲劳行为.研究发现:在同样的断裂循环周次下,前者的疲劳抗力低于后者.观察表明:MMC与ZL109的疲劳断口上都存在着大量韧窝,ZL109的断口上有少量的硅相解理,MMC断口上有纤维断裂和脱粘的现象.没有观察到疲劳辉纹.两者的疲劳断裂机制都是微孔在第二相(硅相、纤维和析出相)与基体的界面形核,然后长大并连接.
The low-temperature fatigue behavior of mullite-structured aluminum short fiber reinforced ZL109 composites (MMC) and ZL109 alloy at 573K was investigated. The results show that under the same fracture cycle, the fatigue resistance of the former is lower than the latter The observation shows that a large number of dimples exist on the fatigue fracture surfaces of MMC and ZL109, and a small amount of silicon phase cleavage occurs on the fracture surface of ZL109, and the fiber fracture and debonding phenomenon on the MMC fracture surface. Both fatigue fracture mechanisms are micropores in the second phase (silicon phase, fiber and precipitation phase) and matrix interface nucleation, growth and connection.