Friction stir welded AZ31 magnesium alloy: Microstructure, texture, and tensile properties

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Journal titleMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Pages323336; # of pages: 14
SubjectAZ31 magnesium alloy; Basal planes; Base alloys; Crystallographic textures; Fiber texture; Friction stir; Hardening capacities; Heat input; Mg alloy; Normal direction; Prismatic planes; Pyramidal planes; Recrystallized grains; Rolling direction; Rolling sheet; Rotational rates; Stir zones; Strain rate dependence; Strain-hardening exponent; Top surface; Transverse directions; Welding speed; Alloys; Ductility; Magnesium alloys; Recrystallization (metallurgy); Textures; Welding; Friction stir welding
AbstractThis study was aimed at characterizing the microstructure, texture and tensile properties of a friction stir welded AZ31B-H24 Mg alloy with varying tool rotational rates and welding speeds. Friction stir welding (FSW) resulted in the presence of recrystallized grains and the relevant drop in hardness in the stir zone (SZ). The base alloy contained a strong crystallographic texture with basal planes (0002) largely parallel to the rolling sheet surface and 1120 directions aligned in the rolling direction (RD). After FSW the basal planes in the SZ were slightly tilted toward the TD determined from the sheet normal direction (or top surface) and also slightly inclined toward the RD determined from the transverse direction (or cross section) due to the intense shear plastic flow near the pin surface. The prismatic planes (1010) and pyramidal planes (1011) formed fiber textures. After FSW both the strength and ductility of the AZ31B-H24 Mg alloy decreased with a joint efficiency in-between about 75 and 82 pct due to the changes in both grain structure and texture, which also weakened the strain rate dependence of tensile properties. The welding speed and rotational rate exhibited a stronger effect on the YS than the UTS. Despite the lower ductility, strain-hardening exponent and hardening capacity, a higher YS was obtained at a higher welding speed and lower rotational rate mainly due to the smaller recrystallized grains in the SZ arising from the lower heat input. © 2012 The Minerals, Metals & Materials Society and ASM International.
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AffiliationNational Research Council Canada (NRC-CNRC); Aerospace
Peer reviewedYes
NPARC number21269661
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Record identifier3345ae01-7ef0-4d4b-a4ac-c3f140c220fa
Record created2013-12-13
Record modified2016-05-09
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