Thermodynamic calculated and TEM observed microstructure of Al-Li-Mg-Si alloys

被引：14
|
作者：
Chen, R
Huang, Z
Chen, CQ [1 ]
Shen, JY
Zhang, YG
机构：
[1] Beijing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Gen Res Inst Nonferrous Met, Beijing 100088, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2000年 / 280卷 / 01期
关键词：
thermodynamic calculation; Al-Li-Mg-Si alloy; microstructures;
D O I：
10.1016/S0921-5093(99)00681-4
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The microstructures of two AI-Li-Mg-Si alloys have been studied by thermodynamic calculation and TEN observation in this paper. The results show that the addition of lithium changes the precipitation behavior of Al-Mg-Si alloys. The calculated AI-Li-Mg-Si phase diagrams are used to investigate the equilibrium phase distribution as a function of temperature for the Al-1.8Li-1.8Mg-0.8Si alloy and Al-1.8Li-2.8Mg-0.8Si alloy. According to calculation, delta' phase (Al3Li) becomes the mayor precipitate in Al-1.8Li-1.8Mg-0.8Si alloy while a few amount of beta'(Mg2Si) phase and AlLiSi phase precipitate. TEM observation show that delta' phase and AlLiSi phase are precipitated in Al-1.8Li-1.8Mg-0.8Si and heterogeneous rod Mg2Si phase is also observed. Calculation on Al-1.8Li-2.8Mg-0.8Si show that both delta' phase and Mg2Si phase precipitate on aging temperature. Experimental results are in agreement with calculation. Published by Elsevier Science S.A.
引用
收藏
页码：146 / 150
页数：5
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