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

被引：15

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

页码：146 / 150

页数：5

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