非连续增强LY12复合材料蠕变机制研究
CREEP BEHAVIOR OF DISCONTINUOUSLY REINFORCED LY12 COMPOSITES
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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.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 mehanism of cxunposites 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 interfac, of cxunposites was analysed by TEM.
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Key words:
- short Mullite fiber /
- aluminum matrix composite /
- creep /
- interface
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