Mechanical and Thermal Expansion Properties of SiC_p/ZAlSi9Mg Composites Produced by Centrifugal Casting

• Published in: 武汉理工大学学报：材料科学英文版 no. 1; pp. 197 - 203
• Main Author: WANG Kai JIANG Tao HUANG Zhili XUE Hansong YANG Dazhuang ZHU Zizong
• Format: Journal Article
• Language: English
• Published: 2016
• Subjects: SiCp/Al复合材料; SiC颗粒; 低热膨胀系数; 机械; 极限抗拉强度; 离心; 结构复合材料; 铸造复合材料
• ISSN: 1000-2413; 1993-0437

Centrifugal casting was applied to produce cylindrical castings using SiCp/Al composite slurry,which contained 20%SiC particles.The castings comprised a particle free zone and a particle rich zone.The amount of SiC particles had a dramatic transformation from the particle rich zone to the particle free zone,and the maximum content of SiC particles in the particle rich zone reached up to 40 vol%.The ultimate tensile strength（UTS） of the as-cast SiCp / Al composites in the particle rich zone was 143 MPa,and the fracture was caused by the desorption of SiC particles from matrix alloy.The coefficient of thermal expansion（CTE） of the SiC_p / Al composites in the range of 20 and 100 ℃ was determined as 16.67×10~（-6） s~（-1）,and the experimental CTE was lower than the predicted data based on the Kerner＇s model.The results show that the decrease in CTE in the case of the composites at high temperature stage can be attributed to the solute concentration of Si in Al and the plastic deformation of the matrix alloy in the composites with void architecture.