Calorimetric analysis of AZ91D magnesium alloy

被引：19

作者：

Guan, Y. C. ^{[1
]}

Zhou, Wei ^{[1
]}

机构：

[1] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Precis Engn & Nanotechnol Ctr, Singapore 639798, Singapore

来源：

MATERIALS LETTERS | 2008年 / 62卷 / 30期

关键词：

Magnesium alloy; Kinetics; DSC; Diffusion; Activation energy;

D O I：

10.1016/j.matlet.2008.08.025

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to study the activation energies and microstructure evolution of beta-Mg17Al12 and eutectic structure in AZ91D magnesium alloy, calorimetric analyses were carried out using non-isothermal measurements by DSC and scanning electron microscopy (SEM) with EDX. During DSC tests, two peak temperatures of beta-Mg17Al12 dissolution/precipitation and eutectic transformation were delayed in the heating/cooling process with the increase of scanning rates due to the occurrence of superheating/supercooling. Activation energies of beta-Mg17Al12 dissolution and eutectic transformation were derived using multiple heating rates. Furthermore, the results of SEM and EDX revealed that the size and morphology of eutectic structures in the alloy had a close relationship with the time of beta-Mg17Al12 phase dissolution during the heating process. More eutectic structures formed at low scanning rate due to sufficient time for the diffusion of Al in alpha-Mg regions. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：4494 / 4496

页数：3

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