Fatigue Characteristics and Microstructure of SiCp/Al-20Si Composite Produced by Sprayed-deposition
15% (volume fraction) SiCp/Al-20Si composite and its matrix alloy was fabricated by spray deposition.The microstructures, high-cycle fatigue properties, fatigue crack growth and fatigue facture surfaces of composite and its matrix alloy were investigated, respectively.The results show that the high-cycle fatigue properties of SiCp/Al-20Si composite are superior, for SiC particles improve the mechanical properties of composite.The fracture of Si and the interfacial debonding including both Al/Si and Al/SiC were the principle mechanisms of the fatigue fracture of composite materials.Detailed quantitative analyses indicates that the extent of SiC particle cracking induces a high level of fatigue crack closure, which effectively reduces the crack growth driving force to slow down fatigue crack growth, then results in superior fatigue crack propagation properties for a given AK, i.e.lower crack growth rate and higher intrinsic threshold stress intensity factor compared to the matrix alloy.Crack deflections around SiC particles and particle cracking are the principle mechanisms of interaction between SiC particles and crack tip.
Composite Fatigue Fracture surface Si phase SiC particles
Wei Li Yunfei Ning Jian Chen Yongle Hu Jianjun He Cong Li
School of Energy and Power Engineering,Changsha University of Science & Technology,Changsha,Hunan 41 School of Energy and Power Engineering,Changsha University of Science & Technology,Changsha,Hunan 41
国际会议
2014 International Symposium on Structural Integrity,ISSI2014(2014国际结构完整性学术会议)
兰州
英文
145-150
2014-08-20（万方平台首次上网日期，不代表论文的发表时间）