【摘要】 研究了应力、温度和热处理对２２ｖｏｌ％莫来石短纤维增强ＬＹ１２复合材料性能的影响，实验采用铸态、退火态和Ｔ４处理复合材料，三种状态下复合材料的抗蠕变性能均高于基体材料ＬＹ１２铝合金。文中提出一种复合材料的蠕变机制：在低应力阶段，复合材料的蠕变受位错的攀移过程所控制；在高应力阶段，复合材料的蠕变受增强体与基体的界面所控制。用ＴＥＭ分析了材料的界面。更多还原

【Abstract】 The effects of stress, temperature and heat treatment on the steady state creep rate of 22vol% short Mullite fiber reinforced LY12 composites were studied. A creep mechanism of composites was advanced. The creep behavior of composites was controlled by the climb of dislocation at low stress state and by the interface conditions at high stress state. The interface of composites was analysed by TEM.更多还原