Microstructural stability during low temperature exposure of alloys within the Al-Li-Cu-Mg system

被引：48

作者：

Katsikis, S. ^{[1
]}

Noble, B. ^{[1
]}

Harris, S. J. ^{[1
]}

机构：

[1] Univ Nottingham, Sch Mech Mat & Mfg Engn, Adv Mat Res Grp, Nottingham NG7 2RD, England

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 485卷 / 1-2期

关键词：

Al-Li; Al-Li-Cu; Al-Li-Cu-Mg; delta'; strength; toughness;

D O I：

10.1016/j.msea.2007.10.020

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 [材料科学与工程]; 080502 [材料学];

摘要：

Al-1.7%Li, Al-1.7%Li-Cu, and Al-1.7%Li-Cu-Mg alloys have been given a damage-tolerant age of 24 h at 150 degrees C and then exposed for 1000 h at 70 degrees C. As a result of exposure, all alloys underwent an increase in strength and a decrease in toughness largely as a result of continued precipitation of delta'. The magnitude of this change in mechanical properties increased in the sequence Al-Li < Al-Li-Cu < AI-Li-Cu-Mg. The reasons for the different behaviour during exposure of the various alloys have been sought by TEM, DSC and electrical resistivity measurements. From these results it is proposed that the mechanisms of delta' formation during exposure are widely different in the three alloy systems. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：613 / 620

页数：8

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