| 纳米SiC颗粒增强镁基复合材料的动态断裂行为研究 |
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| 引用本文： | 刘世英,李文珍,何广进.纳米SiC颗粒增强镁基复合材料的动态断裂行为研究[J].铸造,2012,61(7):722-726. |
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| 作者姓名： | 刘世英 李文珍 何广进 |
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| 作者单位： | 1. 北京航空材料研究院,北京,100095
2. 清华大学机械工程系先进成形制造教育部重点实验室,北京,100084 |
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| 摘 要： | 采用机械搅拌与高能超声处理相结合的分散法制备了纳米SiC颗粒增强AZ91D镁基复合材料(n-SiCp/AZ91D),利用动态SEM原位拉伸方法研究了纳米复合材料的断裂行为.结果表明:微裂纹主要在晶界上的β-Mg17Al12处萌生,并沿着晶界上的脆性相不断开裂和连接向前扩展,由于颗粒和界面的阻碍,裂纹扩展路径较长.AZ91D合金的裂纹也主要沿着晶界上的脆性相不断向前扩展,但裂纹扩展路径比较平坦,AZ91D合金在加载初期就萌生出大量的裂纹.
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| 关 键 词： | 镁基纳米复合材料 颗粒增强 原位拉伸 动态断裂机制 |
Study on Behavior of Dynamic Fracture in SiC Nanoparticles Reinforced Magnesium Matrix Composites |
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| LIU Shi-ying
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LI Wen-zhen
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HE Guang-jin.Study on Behavior of Dynamic Fracture in SiC Nanoparticles Reinforced Magnesium Matrix Composites[J].Foundry,2012,61(7):722-726. |
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| Authors: | LIU Shi-ying LI Wen-zhen HE Guang-jin |
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| Affiliation: | 1.Beijing Institute of Aeronautical Materials,Beijing 100095,China;2.Key Laboratory for Advance Materials Processing Techonology,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China) |
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| Abstract: | Magnesium matrix nanocomposite reinforced with nano-sized SiC particles was fabricated by mechanical stirring and high intensity ultrasonic dispersion processing(n-SiCp /AZ91D).The fracture behavior of n-SiCp /AZ91D composite has been observed by SEM in-situ tensile test.It is found that the crack initiation appeares in β-Mg17Al12 of the grain boundary initially.The main crack propagates along the fracture of brittle phase.Due to the cohesion of the matrix-particle interface is strong and the propagating cracks are impeded,the main crack propagation path is long.The crack of AZ91D matrix is formed by brittle phase cracking and then propagation along grain boundary.But crack propagation path is rather flat.There were lots of crack appeared during the initiation of loading. |
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| Keywords: | magnesium matrix nanocomposite particle reinforcement in-situ tensile mechanism of dynamic fracture |
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