Mechanical Properties of Discontinuous SiC Reinforced Aluminum Composites at Elevated Temperatures
Mechanical Properties of Discontinuous SiC Reinforced Aluminum Composites at Elevated Temperatures
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高温下不连续 SiC 增强铝复合材料的机械性能
DOI：
10.1115/1.3226033
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
T. Langdon
中科院分区：
文献类型：
--
作者：
T. Nieh;K. Xia;T. Langdon
综述了2124和6061铝基非连续、晶须和颗粒状SiC增强铝基复合材料的高温力学性能。结果表明，这些复合材料的行为类似于传统的氧化物弥散强化合金。也就是说，它们表现出低的应变速率敏感性和高的蠕变变形表观激活能。尽管SiC的加入显著改善了铝在室温下的机械性能，但复合材料在高温下的机械强度主要由铝基体的强度决定。这是因为SiC弥散体通常太粗，并且它们不是位错运动的有效屏障。它也表明，SiC颗粒复合材料是较低的抗蠕变比SiC晶须复合材料。
High temperature mechanical properties of discontinuous, whisker and particulate, SiC reinforced aluminum composites, including 2124 and 6061 alloy matrices, are reviewed. It is shown that the behavior of these composites is similar to conventional oxide dispersion strengthened alloys. Namely, they exhibit a low strain rate senstivity and a high apparent activation energy for creep deformation. Despite the fact that the addition of SiC significantly improves the mechanical properties of aluminum at room temperature, the mechanical strength of the composite at elevated temperatures is dominated by the strength of the aluminum matrix This is because the SiC dispersoids are, in general, too coarse and they are not effective barriers for dislocation motion. It is also demonstrated that SiC particulate composites are less creep resistant than SiC whisker composites.