Residual stresses and tensile properties of friction stir welded AZ31B-H24 magnesium alloy in lap configuration

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DOIResolve DOI: http://doi.org/10.1007/s11663-015-0338-6
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TypeArticle
Journal titleMetallurgical and Materials Transactions B
ISSN1543-1916
Volume46
Issue4
Pages16261637; # of pages: 12
AbstractAZ31B-H24 Mg alloy sheets with a thickness of 2 mm were friction stir welded in lap configuration using two tool rotational rates of 1000 and 1500 rpm and two welding speeds of 10 and 20 mm/s. The residual stresses in the longitudinal and transverse directions of the weldments were determined using X-ray diffraction. The shear tensile behavior of the lap joints was evaluated at low [233 K (−40 °C)], room [298 K (25 °C)], and elevated [453 K (180 °C)] temperatures. The failure load was highest for the lower heat input condition that was obtained at a tool rotational rate of 1000 rpm and a welding speed of 20 mm/s for all the test temperatures, due to the smaller hooking height, larger effective sheet thickness, and lower tensile residual stresses, as compared to the other two welding conditions that were conducted at a higher tool rotational rate or lower welding speed. The lap joints usually fractured on the advancing side of the top sheet near the interface between the thermo-mechanically affected zone and the stir zone. Elevated temperature testing of the weld assembled at a tool rotational rate of 1000 rpm and a welding speed of 20 mm/s led to the failure along the sheet interface in shear fracture mode due to the high integrity of the joint that exhibited large plastic deformation and higher total energy absorption.
Publication date
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
NPARC number21276026
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Record identifier6999324c-10f0-4090-b3e7-813278060d8f
Record created2015-09-15
Record modified2016-05-09
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