C.G.Jiao
,
G.F. Yu and M.G. Yan(Institute of Aeronautical Materials
,
Beijing 100095
,
China Manuscript received 26 August 1996)
金属学报(英文版)
The influences of Cu and Mg on the microstructure and properties of rapidly solidified Al(3-4 wt% )Li alloys prepared by atomization technique have been studied in the present investigation.The results showed that additions of Cu and Mg in high lithium content RS Al-Li alloys are limited due to the formation of coarse intermetallics during solution treatment. With certain addition of Cu,Mg and conventional heat treatment, the Cu and Mg containing phase S(Al_2CuMg)was found to co-precipitate with δ' (Al_3Li) in the alloys. However the acceptable combinations of strength and ductility of the alloy could not be acquired. Optimizations of Cu and Mg content added in high lithium RS Al-Li alloys are given and the reasons are discussed in detail.
关键词:
:Al-Li alloy
,
null
,
null
孟亮
,
耿东生
,
郑修麟
金属学报
测定了含不同浓度有害杂质及Ｃｅ的８０９０合金薄板不同方向力学性能及断裂性能．结果表明：Ｆｅ，Ｓｉ使各方向的断裂韧性下降，并使４５°方向上的裂纹启裂阻力下降，Ｎａ，Ｋ除对Ｔ－Ｌ方向的启裂阻力不造成明显损害外，能够损害各方向的断裂性能．在合金中添加０．０９％Ｃｅ即可显示有益的合金化作用；如果添加０．２８％Ｃｅ，可明显改善含一定量Ｆｅ，Ｓｉ的合金薄板各方向的断裂性能，其主要原因在于Ｃｅ可通过使再结晶组织均匀，细化晶粒，减少晶界析出相及改善断裂过程等机制抑制杂质对断裂性能的危害．
关键词:
Ａｌ－Ｌｉ合金
,
impurity
,
Ce
,
fracture behaviour
刘玉梅
,
赵友昌
,
于文学
,
高玉芹
,
郭昕昱
,
周海鹏
,
毛文锋
,
朱义元
金属学报
本文研究和比较了Ａｌ－Ｌｉ合金超塑平面应变和双轴拉伸应变中空洞生长的特点及空洞受到抑制的程度．实验表明，平面应变中空洞生长的速度明显高于双轴拉伸应变；施加水静压应力有抑制空洞的作用．平面应变空洞生长受到抑制的程度明显低于双轴拉伸应变，因而，平面应变中要适当提高压应力的强度．
关键词:
Ａｌ－Ｌｉ合金
,
plane strain
,
double axis tensile strain
,
cavity growing
,
null
