The significance of intermetallic compounds formed during interdiffusion in aluminum and magnesium dissimilar welds

Diffusion couples between Al-AA6111 and Mg-AZ31 have been used to perform a comprehensive review of the IMC phases that develop in this system, including; their growth kinetics, texture, residual stresses, and mechanical properties. The new observations made have been compared to data in the literat...

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Bibliographic Details
Published in:Materials characterization 2017-12, Vol.134, p.84-95
Main Authors: Wang, Yin, Prangnell, Philip B.
Format: Article
Language:English
Subjects:
ALUMINIUM ALLOYS
DIFFUSION
FRACTURE PROPERTIES
HEAT TREATMENTS
INTERFACES
INTERMETALLIC COMPOUNDS
LAYERS
MAGNESIUM ALLOY-AZ31B
MATERIALS SCIENCE
RESIDUAL STRESSES
WELDED JOINTS
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Summary:Diffusion couples between Al-AA6111 and Mg-AZ31 have been used to perform a comprehensive review of the IMC phases that develop in this system, including; their growth kinetics, texture, residual stresses, and mechanical properties. The new observations made have been compared to data in the literature with the aim of providing an in-depth understanding of the detrimental effects of interfacial reaction in aluminum–magnesium dissimilar welding. Three Al–Mg binary IMC phases were identified, γ-Al12Mg17 and β-Al3Mg2, as well as ε-Al30Mg23, which has not been previously reported in inter-diffusion studies. The β phase had the highest growth rate and became the dominant constituent of the IMC layer at longer reaction times. The ε-phase only appeared after extended heat treatment, via transformation at the Al12Mg17/Al3Mg2 interface. Intrinsic diffusion coefficients of Al and Mg, calculated in the Al3Mg2 phase, confirmed that Al is the faster diffusing species (by an order of magnitude) during IMC growth. Indentation techniques showed that all the IMC phases had extremely low toughness (
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2017.09.040