In-situ Observations of Fracture Processes in 0.6 μm and 9.5 μm SiCP/6061Al Composites
In-situ Observations of Fracture Processes in 0.6 μm and 9.5 μm SiCP/6061Al Composites
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0.6 μm 和 9.5 μm SiCP/6061Al 复合材料断裂过程的原位观察
DOI：
10.2320/matertrans.46.34
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发表时间：
2005
影响因子：
1.2
通讯作者：
Zhongguang Wang
中科院分区：
文献类型：
--
作者：
L. Qian;H. Toda;S. Morita;Toshiro Kobayashi;Zhongguang Wang
用扫描电镜原位观察了粗颗粒和线状SiC颗粒增强6061铝合金复合材料的断裂过程。进行了研究，以澄清其断裂机制。结果表明，在粗颗粒增强复合材料中，在主裂纹尖端之前，SiC颗粒周围的基体中形成了空洞。然后相互聚合，最后与主裂纹尖端连接。导致主裂纹的扩展。然而.在细颗粒增强复合材料中，在SiC颗粒团与周围基体的边界处或颗粒团内部形成了多个微裂纹。然后相互连接，最后与主裂纹尖端连接。裂纹分叉、多裂纹和裂纹偏转是细颗粒增强复合材料断裂韧性提高的主要原因。
ln-situ SEM observations of fracture processes in two 6061 Al alloy composites reinforced with coarse and line SiC particles, respectively. were carried out to clarify their fracture mechanisms. It was found that in the coarse particle reinforced composite, void were formed in the matrix around SiC particles ahead of the main crack tip. then coalesced with each other, and finally connected with the main crack tip. Causing propagation of the main crack. However. in the fine particle reinforced composite, multiple in micro-cracks were formed at the boundaries between SiC particle clusters and surrounding matrix or within the clusters. then connected with each other, and finally joined with the main crack tip. leading to crack branching and growth of the main crack, Crack branching, multiple cracking and crack deflection were proposed to contribute to the enhanced fracture toughness in the fine particle reinforced composite compared with the coarse particle reinforced composite.