摘要
本文研究了通过压力铸造法引入体积分数为17％的SiC晶须后,对Al-2.0wt％Li合金在550℃固溶化和190℃时效条件下拉伸变形行为的影响。结果表明:17％SiCw/Al-2.0Li复合材料的起始塑变抗力主要受基体合金的时效状态所决定,而受SiC晶须的直接影响较小。SiC晶须的强化作用主要在于提高了加工硬化事。通过观察变形后位错组态的变化表明,SiC晶须的存在可以抑制位错切过δ′相而引起的共面滑移。
In this paper, an Al-2.0wt%Li alloy matrix composite consisting of 17vol% SiC whiskers was fabricated by squeeze casting method. Tensile deformation behaviors of the composite solution treated at 550℃ for 30min and aged at 190℃ were investigated. The results show that the initial plastic deformation resistance of the SiCw/Al-Li composite is mainly controlled by aging conditions, while the SiC whiskers have less effects on it. The strengthening effect played by the SiC whiskers is to increase work-hardening rates of the composite. The observation of dislocation structure in the specimens after tensile deformation indicates that SiC whiskers can supprcss planar slip caused by dislocations cutting δ' phase.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
1993年第3期6-11,共6页
Materials Science and Technology
基金
国家自然科学基金
关键词
碳化硅
晶须
铝锂合金
拉伸
变形
SiC whisker
AI-Li alloy
Tensile deformation
