Mechanical properties of Csf/AZ91D composites fabricated by extrusion forming process directly following the vacuum infiltration

Jiming Zhou, Lehua Qi, Haibo Ouyang, Hejun Li

科研成果: 书/报告/会议事项章节会议稿件同行评审

6 引用 (Scopus)

摘要

Magnesium matrix composites are attractive for weight critical application, such as automotive and aerospace components, because of its high specific strength and stiffness. Extrusion process directly following vacuum infiltration (EVI) can eliminate the porosity and obtain the well-aligned and uniform fiber distribution during the fabrication of Csf/AZ91D composite. This process combines the advantages of gas pressure infiltration, squeeze casting, and semi-solid extrusion. The mechanical properties of the magnesium are improved greatly by introducing the carbon fibers into the magnesium matrix through the EVI process. In the present stud study, the carbon short fiber reinforced magnesium matrix composites Csf/AZ91D were fabricated by EVI process. The microstructure and tensile property of Csf/AZ91D composites were investigated. The results showed that the microstructure of the composite presented a uniform distribution of carbon short fibers in the matrix and good interfacial integrity. The yield strength and stiffness of the composites increased with increasing carbon short fiber content, but at the cost of ductility. Nonetheless, Csf/AZ91D can keep relatively high ductility during the improvement of strength compared with reported composites in the literatures. Increasing carbon fiber content in the composite was not always beneficial to the ultimate tensile strength at the same magnitude. When the fiber content exceeds 10%, the matrix was not strengthened as greatly as under 10% fiber content. The yield strength improvement was attributed to (i) load load-bearing effects due to the presence of carbon short fiber reinforcements; (ii) grain size ref refinement due to the large extrusion deformation; (iii) generation of dislocations to accommodate CTE mismatch between the matrix and the particles.

源语言英语
主期刊名THERMEC 2009 Supplement
692-696
页数5
DOI
出版状态已出版 - 2010
活动6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009 - Berlin, 德国
期限: 25 8月 200929 8月 2009

出版系列

姓名Advanced Materials Research
89-91
ISSN(印刷版)1022-6680

会议

会议6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009
国家/地区德国
Berlin
时期25/08/0929/08/09

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