Effect of Si content on the low-cycle fatigue behavior of SiCp/Al-Si composite produced by sprayed-deposition
(0) The low-cycle fatigue behavior of the SiCp/Al-Si composites with different Si content (7%, 13% and 20%Si) was investigated.The experimental dates demonstrate that all composites can be described by the Coffin-Manson relationship.The fatigue-ductility exponent (c) is-0.5284 for the composite with 7% Si,-0.4526 for the composite with 13%Si, and-0.5954 for the composite with 20% Si, respectively.The fatigue-ductility coefficient (εf) of composite with 7% Si content (2.63)is higher than that the composite with 13% Si (1.09) and 20% Si (0.85), implying that the composite with a higher Si content exhibits a lower fatigue life.With the increase of the Si content, the degree of cyclic hardening is reduced.It can be ascribe to the increased fracture of the primary Si phase and the formation of micro-cracks originating from the nucleation of many voids at the interface between the Si phase and the matrix.A larger number cycle is beneficial to easier linking from one or more macroscopic cracks and thus leads to more serious softening, which causes stress relaxation and offsets part of the hardening effect derived from the increased dislocation density.
Low-cycle fatigue life Spray deposition Composites Fracture
Wei Li Yunfei Ning Jian Chen Jianjun He Cong Li
School of Energy and Power Engineering,Changsha University of Science & Technology,Changsha 410014,C School of Energy and Power Engineering,Changsha University of Science & Technology,Changsha 410014,C
国际会议
2015 International Symposium on Structural Integrity(2015年国际结构完整性学术会议)
沈阳
英文
61-67
2015-05-16（万方平台首次上网日期，不代表论文的发表时间）