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原位合成TiB2/ZL109复合材料的高温蠕变行为

, PP. 36-40

Keywords: TiB2/,ZL109,复合材料,原位合成,蠕变,颗粒

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Abstract:

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Monkman2Grant经验公式来描述,蠕变断裂特征为延性断裂。

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