Hardening precipitation in a Mg-4Y-3RE alloy

被引：331

作者：

Antion, C ^{[1
]}

Donnadieu, P ^{[1
]}

Perrard, F ^{[1
]}

Deschamps, A ^{[1
]}

Tassin, C ^{[1
]}

Pisch, A ^{[1
]}

机构：

[1] Domaine Univ, Lab Met & Physicochim Met, F-38402 St Martin Dheres, France

来源：

ACTA MATERIALIA | 2003年 / 51卷 / 18期

关键词：

ageing; magnesium alloys; rare earth; TEM; SAXS;

D O I：

10.1016/S1359-6454(03)00391-4

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

Early stages of precipitation in a Mg-Y-Nd based alloy aged at 150 degreesC have been studied using TEM and small angle X-ray scattering (SAXS). The former brings information concerning nature, morphology and size of precipitates, and the latter adds qualitative and quantitative information concerning populations of precipitates in terms of size and volume fraction. Precipitation at 150 degreesC involves formation of DO19 monoplanar precipitates, which further develop into the beta" and beta' phases having platelet and globular morphologies, respectively. TEM observations on samples aged at 150 degreesC reveal the formation mechanism of the bco-beta' structure by the ordering of monoplanar DO19-beta" precipitates. Additional examinations at 250 degreesC revealed the DO19-beta"-->bco-beta' transformation, as well as beta(1) precipitates. Estimation of the volume fraction deduced from SAXS is discussed on the basis of the TEM results. (C) 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5335 / 5348

页数：14

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