采用原位合成方法制备了TiB2超细颗粒增强ZL109复合材料,对材料进行了高温拉伸蠕变实验.实验结果表明,复合材料在高温恒应力条件下,表现出高的名义应力指数和高的名义蠕变激活能,优于纯Al和ZL109合金,而且比常规外加颗粒复合材料具有更好的高温蠕变性能.引入门槛应力概念,复合材料的蠕变实验结果能够用微观结构不变模型来解释,说明复合材料的蠕变受到基体点阵扩散的控制.复合材料的蠕变断裂行为可以用Monkman-Grant经验公式来描述,蠕变断裂特征为延性断裂.
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