Transactions of Materials and Heat Treatment. 2010, (03) Core

Influence of electric field on interfacial diffusion reaction and microstructure of diffusion dissolution layer of AZ31B/Al jointChinese Full Text

DU Zheng-liang, LIU Fen-jun, CHEN Shao-ping, MENG Qing-sen(College of Materials Science and Engineering, Taiyuan University of Technology,Taiyuan 030024,China)

Abstract: Interfacial diffusion reaction and structure of Mg-Al diffusion dissolution layer at interface of AZ31B/Al joints prepared by electric field-activated diffusion bonding（EFADB）process using aluminum powder and aluminium foil as intermediate layer, respectively, were investigated. The microstructure, phases and component distribution of the Mg-Al diffusion dissolution layer were analysed by means of optical microscope, SEM, EDS and XRD. The results show that when the intermediate layer is aluminum powder the diffusion dissolution layer is composed of eutectic layer, transition layer and cellular crystal layer, and the dissolution layer consists of eutectic layer and transition layer when the intermediate layer is aluminum foil. The morphology and width of the diffusion dissolution layer are significantly affected by the electric field intensity. When the current density is 80 A·cm-2 , the thickness of the transition layer is 120 μm, which is 12 times of that at current-free condition for the AZ31B/Al joint prepared at 450 ℃ for 50 min using aluminum powder as the intermediate layer. The grain size of the eutectic layer decreses from 2 μm to 0.5 μm when the current density increases from 28 A·cm-2 to 48 A·cm-2 .

Keywords：

AZ31B; aluminum; solid state diffusion; electric field; diffusion dissolution;

DOI：
10.13289/j.issn.1009-6264.2010.03.015
Series：
Subject：
Classification Code：
TG401

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Influence of electric field on interfacial diffusion reaction and microstructure of diffusion dissolution layer of AZ31B/Al jointChinese Full Text

DU Zheng-liang, LIU Fen-jun, CHEN Shao-ping, MENG Qing-sen(College of Materials Science and Engineering, Taiyuan University of Technology,Taiyuan 030024,China)

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