本文作者研究了600℃水淬和600℃退火处理的碳化硅晶须增强铝基复合材料的热膨胀行为,阐述两者热膨胀行为与内应力的内在关系.结果表明:淬火后复合材料基体的位错密度、内应力、及材料的有效屈服强度较高;而退火后复合材料基体的位错密度、内应力、及材料的有效屈服强度较低.当材料在600℃淬火后,升温过程中材料的热膨胀系数曲线在80℃和245℃各出现一个峰值,且后者明显高于前者;而600℃退火后材料的热膨胀系数曲线只在80℃出现一个波峰,且其峰值低于淬火材料相应的峰值.分析表明:材料热膨胀系数曲线出现的第一个峰是基体内拉应力释放的结果;而淬火后材料热膨胀系数曲线出现的第二个峰是基体压应力释放速率的标志.
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