Microstructure and strengthening of Al-Li-Cu-Mg alloys and MMCs: I. Analysis and modelling of microstructural changes

被引：65

作者：

Starink, MJ ^{[1
]}

Wang, P ^{[1
]}

Sinclair, I ^{[1
]}

Gregson, PJ ^{[1
]}

机构：

[1] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, Hants, England

来源：

ACTA MATERIALIA | 1999年 / 47卷 / 14期

基金：

英国工程与自然科学研究理事会;

关键词：

differential thermal analysis (DTA); aluminium; aging; microstructure; kinetics theory and modeling;

D O I：

10.1016/S1359-6454(99)00227-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A complete and detailed analysis of the microstructural development during ageing in an 8090 (Al-2.3Li-1.2Cu-1Mg-O.1Zr) alloy, an 8090/20 wt% SiCp MMC, an Al-1.5Li-Cu-Mg MMC and an Al-Cu-Mg MMC (all with similar Cu and Mg contents) has been performed. Volume fractions of all precipitates relevant for precipitation strengthening of the alloys (delta' phase, S' phase and GPB zones) have been determined using a recently derived method based on differential scanning calorimetry (DSC). The Volume fractions have subsequently been successfully fitted using a novel model for transformation kinetics. The sizes of these precipitates have been analysed using newly derived expressions consistent with the latter model. As a result of dislocation generation around misfitting SiC particles the Volume fractions of both GPB zones and S' phase depend strongly on the presence of these particles. Also the amount of Li present in the alloys influences the volume fractions of the phases significantly. The sizes of S' are similar for the four alloys. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：3841 / 3853

页数：13

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