摘要
从宏观和微观两方面研究了ＳｉＣ颗粒分布状况对陶瓷颗粒增强金属基复合材料激光热冲击破坏的影响，发现微裂纹形成是由基体内的孔洞和颗粒与基体脱胶所引起，而陶瓷颗粒分布不均匀对裂纹的扩展机理有重要影响。
Thermal failure of particulatereinforced 6061
aluminum alloy composites with two kinds of particle distribution has been investigated. The
thermal failure was induced by the coupled load of laser thermal shock and mechanical load.
The initiations of microfracture in composites for homogeneous and heterogeneous particle
distributions are both in the form of void in matrix or decohesion at the interface between the
particle and the matrix. However, their mechanisms of the crack propagation are very different.
The macrocrack formation is produced in the form of the separation of the SiC particlematrix
interface or in the form of void nucleation and growth within the matrix for the composites with
homogeneous particles distribution. However, for the composites with heterogeneous particles
distribution, the reinforcement SiC particle fracture is the dominant damage mechanism for
macrocrack proagation. As the results of the different microbehavioures of the composites, their
mechanical properties are different. The strength of the composties with heterogeneous particle
distribution is very lower than that of the composites with homogeneous particles distribution.
出处
《湘潭大学自然科学学报》
CAS
CSCD
1999年第2期25-29,共5页
Natural Science Journal of Xiangtan University
基金
国家自然科学基金
湖南省教委资助项目
关键词
金属基复合材料
颗粒分布
激光热冲击
裂纹扩展
metal matrix composites, particle distributions, thermal failure, thermal shock
induced by laser
