摘要
在对变形铝锂合金成分及其相图进行充分分析的基础上，选取了一种高锂低铜成分的铸造铝锂合金．通过组织分析和力学性能测试的结果表明：Ｚｒ不仅细化晶粒，而且改善δ’相的析出，对性能的提高起重要作用；在铸造条件下，凝固过程可进行到５４７℃包晶反应发生；合金主要强化相是δ’与Ｔ１；晶界上ＰＦＺ、富Ｓｉ相及平衡相Ｔ２的形成是导致沿晶断裂的主要原因．
On the basis of the constitutions and diagrams of deformed Al--Li alloys studied, a casting Al--Li alloy with high Li and low Cu content was chose in this paper. Throuth structure analysis and mechanical propertics test, the results show that Zr addition refines the grain, develops the δ' precipitation, and plays an important role in the property improvement, Under the casting condition, the solidification process proceed to 547 ℃, at which the peritetic reaction happedd. δ' and T1 were the main strengthen phase, and formation of PFZ, Si richphase and cquilibrium T2 phase were the reason resulting in intergranular fracture.
出处
《材料科学与工艺》
CAS
CSCD
北大核心
1994年第2期60-64,共5页
Materials Science and Technology
关键词
铸造
铝锂合金
凝固
力学性质
casting Al-Li alloy, solodification structure
mechanical property
