Effects of particle size and properties on the microstructures, mechanical properties, and fracture mechanisms of 7075Al hybrid composites prepared by squeeze casting

被引:20
|
作者
Liu, Yixiong [1 ]
Yang, Chao [1 ]
Chen, Weiping [1 ]
Zhu, Dezhi [1 ]
Li, Yuanyuan [1 ]
机构
[1] S China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Metall M, Guangzhou 510640, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
METAL-MATRIX COMPOSITES; REINFORCED ALUMINUM; CRACK-GROWTH; BEHAVIOR; DEFORMATION; INITIATION; TOUGHNESS;
D O I
10.1007/s10853-014-8496-5
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
To investigate the effects of particle size and properties on the mechanical properties of 7075Al matrix composites, hybrid composites reinforced using three different reinforcement combinations, 40 vol. % 7 mu m SiCp with 5 vol. % 7 mu m SiCp, 35 mu m SiCp, and 35 mu m Ti, were prepared using squeeze casting. The failure mechanisms and the microstructure-property relationships of hybrid composites were studied using SEM, TEM, and tensile tests. The composite containing Ti particles achieved the highest tensile strength of 626 MPa and an elongation of 1.2 %. Fracture mechanism analyses imply that the reduced strength for the 35 mu m SiCp-containing composite are caused by the inefficient load transfer capability resulting from the preferential breakage of larger-sized SiCp particles during the deformation process. In contrast, micro-zones formed by Ti particles at the center and matrix alloy with few dislocations around release stress and deform synergistically during deformation, which decreases the breakage of SiCp and improves the plastic deformation ability of the matrix alloy, resulting in a good combination of strength and ductility.
引用
收藏
页码:7855 / 7863
页数:9
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