In situ small-angle scattering study of the precipitation kinetics in an Al-Zr-Sc alloy

被引：83

作者：

Deschamps, A. ^{[1
]}

Lae, L. ^{[1
]}

Guyot, P. ^{[1
]}

机构：

[1] Inst Natl Polytech Grenoble, SIMAP, UJF, F-38402 St Martin Dheres, France

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 08期

关键词：

small angle X-ray scattering; aluminium alloys; Al-Zr-Sc; precipitation; chemical heterogeneity;

D O I：

10.1016/j.actamat.2006.12.015

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A time-resolved small-angle X-ray scattering (SAXS) study was carried out to investigate the precipitation kinetics of Ll(2) Al-3(Zr, Sc) precipitates in aluminium at temperatures ranging between 400 and 475 degrees C. It is shown that the chemical heterogeneity of the precipitates, which consist of a Se-rich core and a Zr-rich shell, results in a characteristic SAXS signal, which can be fitted by a three-phase model to extract the chemical and morphological features of the precipitate size distribution. The experimental results show a strong effect of the heating rate on the precipitation kinetics, and a precipitate density strikingly constant with time in the investigated range. These results are discussed in view of the mechanisms proposed in the existing literature for the formation of the core-shell structure of these precipitates. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2775 / 2783

页数：9

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