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Microstructure and Mechanical Properties of Laser Beam Welded AA7021 Aluminum Alloy

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Abstract:

In this study, a laser beam welds in a Al-Zn-Mg alloy were characterized by optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and tensile tests. It is found that the joint of the alloy contained three distinctive regions, i.e. fusion zone, heat affected zone and base metal region. The fusion zone consists of small grains, whose size is heterogeneously distributed. Extensive microhardness measurements were conducted in the weld regions of the nuggets exhibited a hardness loss in the fusion zone due to the loss of strengthening phases. Microstructural examination of the joints revealed typical eutectic structure was appeared in the heat-affected zone due to relative low cooling rate. Tensile properties of the joints were obtained by testing flat transverse tensile specimens, and the results indicated that tensile strength of these welds approached 76.8~77.3% of the base metal.

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Info:

Periodical:

Applied Mechanics and Materials (Volumes 488-489)

Pages:

106-110

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.488-489.106

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Online since:

January 2014

Authors:

Feng Wang*, Bai Qing Xiong, Yong An Zhang, Hong Wei Liu, Zhi Hui Li, Xi Wu Li, Feng Bin Xia

Keywords:

Al-Zn-Mg Alloy, Laser Beam Welding, Mechanical Property, Microstructure

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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