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Evaluation of FSW Weldability of Wrought and Casting Mg Alloys  

Noh Joong-Suk (부경대학교 공과대학 신소재공학부)
Kim Heung-Ju (포항산업과학연구원(RIST) 용접센터)
Chang Woong-Seong (포항산업과학연구원(RIST) 용접센터)
Bang Kook-Soo (부경대학교 공과대학 신소재공학부)
Publication Information
Journal of Welding and Joining / v.22, no.5, 2004 , pp. 53-57 More about this Journal
Abstract
Friction stir weldability of AZ31B-H24, AZ61A-F and AZ91C-F Mg alloys were studied using microstructural observation and mechanical tests. The microstructure of stir zone(SZ) was coarse in AZ31B-H24 alloy whereas it was very fine both in AZ61A-F and AZ91C-F alloys. The hardness of SZ was remarkably increased by very fine recrystallized grains both in AZ61A-F and AZ91C-F alloys. On the other hand, the hardness of SZ was decreased in AZ31B-H24 due to the coarse microstructure. In SZ, AZ91C-F alloy showed very high hardness values because of dispersion hardening of $Mg_{17}$Al$_{12}$($\beta$ phase) and Al solid solution hardening. Because of more $Mg_{ 17}Al_{12}($\beta$ phase)$ intermetallic compounds, Mg alloy with high Al content showed poor mechanical properties.s.
Keywords
Friction stir welding; Magnesium alloys; ${\beta}$-Mg$_{17}$Al$_{12}$; Tensile test; Hardness;
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