晶须增强铝基复合材料的热压缩变形行为研究  

Hot compressive deformation behavior of an aluminum matrix composite reinforced with whiskers

作　　者：刘瑞锋[1] 李爱滨[1] 耿林[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《材料科学与工艺》2005年第5期481-483,487,共4页Materials Science and Technology

基　　金：国家自然科学基金资助项目(50071018);国家重点基础研究发展规划资助项目(973-G2000067206)

摘　　要：采用试验和数值模拟相结合的方法研究了纵向、横向和倾斜分布的晶须增强铝基复合材料热压缩变形行为.研究表明:S iCw/6061A l复合材料300℃压缩的应力-应变行为与晶须取向角密切相关;在热变形过程中,纵向分布晶须折断严重,导致复合材料表现为应变软化行为;而倾斜于压缩方向30o的晶须折断和转动明显,引起相应复合材料应变软化;横向分布晶须没有转动而折断程度很小,使复合材料呈现出加工硬化行为.The combined experimental and numerical approach is utilized to investigate the hot compressive behaviors of aluminum matrix composites reinforced with longitudinally, transversely and slantingly arranged whisker. Generalized self-consistent finite element model consists of the non-uniformly distributed whiskers, matrix and equivalent material. The result indicates that the stress-strain behaviors of the composites relates to the whisker orientation angle. During the hot compressive deformation, the composite with longitudinally arranged whiskers exhibits strain softening not owing to the whisker rotation but mainly due to the intensive breakage of whisker. The composites with smaller whisker misalignment angle of 30~ show the softening behavior due to both the whisker breakage and rotation. The composites with transversely whisker display the work hardening phenomenon due to the matrix work hardening.

关 键 词：金属基复合材料 有限元分析 晶须取向 热压缩变形行为 

分 类 号：O343[理学—固体力学] TG151[理学—力学]