摘要
对压铸法制造的ＳｉＣｗ／Ａｌ复合材料拉伸强化机理进行了研究，分析了晶须尺寸和基体合金对ＳｉＣｗ／Ａｌ复合材料拉伸强度的影响规律。随晶须长径比的增大，复合材料拉伸强度提高。ＴＥＭ观察发现复合材料的基体合金中晶粒细小，并且位错密度较高，使基体合金与没有晶须增强的相同成分铝合金相比强度有较大提高，这是复合材料高强度的原因之一。研究还发现，由于基体合金强度的提高使复合材料中晶须的临界长度下降，从而导致复合材料的拉伸强度进一步提高。
The tensile strenghtening mechanism of the squeeze casting SiCw/Al composites was studied, and the effects of whisker size and matrix alloy on the tensile strength of the SiCw/Al composites were analyzed. With the increase of the length of the SiC whisker,the tensile strength of the SiCw/Al composites is increased. It was found by TEM observation that there are fine grains and high density of dislocations in thealuminium alloy matrix, which results in a higher strength of the matrix aluminium alloy as compared with that of unreinforced aluminium alloy, and this is one reason of the high tensile strength of the SiCw/Al composites. It is also found that the increase of the strength of the matrix alloy leads to the decrease of the critical length of the SiC whisker in the SiCw/Al composites, which results in the further increase of the tensile strength of the SiCw/Al composites.
出处
《材料科学与工艺》
CAS
CSCD
北大核心
1994年第3期6-11,共6页
Materials Science and Technology
基金
国家"863"高技术课题
关键词
碳化硅
晶须
铝
复合材料
拉伸强度
Silicon carbide
whisker
aluminium
composite
tensile strength
