|About this Abstract
||2012 TMS Annual Meeting & Exhibition
||Magnesium Technology 2012
||Hot Formability Curves for Four Mg AZ31B Sheets Obtained by the Pneumatic Stretching Test
||Fadi Abu-Farha, Ravi Verma, Louis Hector
|On-Site Speaker (Planned)
The formability of four Mg AZ31B sheets produced by either direct chill or twin roll casting, and having different initial grain sizes, was investigated at 400 C and 5x10-3 s-1 using pneumatic stretching. Blanks were pneumatically bulged through four elliptical die inserts, with aspect ratios ranging between 1.0 and 0.4, producing ellipsoidal domes with different biaxial strain combinations. The major strains were aligned either along or across the rolling direction of the material. Strain combinations were measured in the deformed material and mapped onto a formability diagram. Three zones were distinguished in constructing the formability curves for each of the four sheets: safe (no necking), marginal (some necking), and failure (extreme necking and/or rupture). Formability comparisons as a function of sheet rolling direction were quantified with “composite FLDs.” Results obtained for the four sheets are indicative of differences in grain structure and material inhomogeneities.
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