Effect of Si content on microstructure and mechanical properties in the Spray-formed SiCp/Al-Si composites
The effects of silicon content on the microstructure and mechanical properties of SiCp/Al-Si composites produced by spray deposition were investigated with 7, 3 and 20% Si.The optical microstructures indicate that the average size of eutectic Si and primary Si in the composite containing 20% Si (3.44,7.85μm) is higher than that the composite containing 13% Si (2.51, 5.85μm) and 7% Si (1.95, 0μm).Otherwise, the increase of the Si content results in an increase in the volume fraction of the primary Si and the eutectic silicon phases, and a decrease in particle distance between Si and Si phases.The tensile results show that the as-sprayed composite with a higher Si content displays an increase in the elastic modulus, yield strength and ultimate tensile strength, but a decrease in elongation.Both the SiC particle/matrix debonding and Si decohesion are observed in the three composite, while primary Si particle cracking is dominate in the composite with 13% and 20% Si.The fracture reveals an increase in the degree of the brittleness and the cracking tendency of the primary Si particles due to the Si content increasing.
composites microstructure spray deposition fracture
Wei Li Jian Chen Jianjun He Yanjie Ren Wei Qiu YouPing Sun
School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, Hunan Key Laboratory of Automobile Components and Vehicle technology, Guang Xi University of Science and T
国内会议
西安
英文
67-76
2013-10-25（万方平台首次上网日期，不代表论文的发表时间）