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The Evaluation of Weldability for AZ31B-H24 and AZ91C-F Mg Alloys in Friction Stir Welding

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Abstract:

In the present study, an investigation has been carried out on the friction stir welding (FSW) of two magnesium alloys. Hot-rolled and Die-casting plates of AZ type magnesium alloys were successfully joined by friction stir welding. AZ31B-H24 and AZ91C-F plates with the thickness of 4mm were used, and the microstructural development in stir zone (SZ) was investigated using optical and scanning electron microscopes. Hardness of SZ in AZ31B-H24 alloy has been slightly decreased due to the coarse structure. On the other hand, Hardness of SZ in AZ91C-F alloy has been remarkably increased due to very fine recrystallized grain structure. The result of EPMA showed Al Solid solution hardening by Solid solution of β intermetallic compound to α-Mg. While tensile strength of the FSWelded AZ31B-H24 alloy showed about 80% values compare to Base metal, AZ91C-F showed about 68% values due to strongly affected by formation of the intermetallic compounds, β-Al12Mg17.

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Periodical:

Key Engineering Materials (Volumes 321-323)

Pages:

1723-1728

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.321-323.1723

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Online since:

October 2006

Authors:

Woong Seong Chang, Heung Ju Kim, Joong Suk Noh, Han Sur Bang

Keywords:

Die-Casting Plates of AZ Type Magnesium, Friction Stir Welding (FSW), Hot-Rolled Plates of AZ Type Magnesium, Intermetallic Compound (IMC), Recrystallized Grain, Stir Zone

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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