摘要
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 cycle fatigue behavior of monolithic and mullite alluminosilicate short fibre reinforced ZL109 alluminum alloy (MMC) has been investigated at 573K. It was found that the fatigue resistance of MMC is lower than that of ZL109 alloy by about 10MPa. SEM analysis on the fracture surface and the longitudinal section of the fractured specimens revealed dimples on the fracture surfaces of both MMC and ZL109 alloy, cleavage of Si crys-tals in ZL109 alloy, fibre breakage and interface debonding in MMC. No fatigue striations was observed. The failure mechanism of both materials in that voids nucleate at the interfaces of matrix and the second phases (such as Si crys-tals, fibres and precipitations), growth and coalesce, leading to fatigue failure.
出处
《理化检验（物理分册）》
CAS
1998年第11期3-6,共4页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
基金
国家自然科学基金
关键词
硅酸铝纤维
铝基
复合材料
高温低周疲劳
合金
Alluminosilicate firbre Alluminium matrix composites Low-cycle high-temperature fatigue
