Lap shear strength and fatigue behavior of friction stir spot welded dissimilar magnesium-to-aluminum joints with adhesive

  1. Get@NRC: Lap shear strength and fatigue behavior of friction stir spot welded dissimilar magnesium-to-aluminum joints with adhesive (Opens in a new window)
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Journal titleMaterials Science and Engineering A
Pages5360; # of pages: 8
SubjectAdhesive interlayers; Al alloys; Anthropogenic greenhouse gas emissions; Automotive sector; Dissimilar weld; Failure energy; Fatigue behavior; Fatigue failure mode; Fatigue failures; Fatigue properties; Friction stir; Friction stir spot welding; Fuel efficiency; Interfacial layer; Lap shear strength; Lightweighting; Loading direction; Mg alloy; Motor vehicle; Pull-out failure; Spot welded; Stir zones; Structural applications; Adhesives; Aluminum; Cyclic loads; Failure modes; Fatigue of materials; Gas emissions; Greenhouse gases; Magnesium; Magnesium alloys; Spot welding; Stress concentration; Welding; Welds; Aluminum alloys
AbstractLightweighting is currently considered as an effective way in improving fuel efficiency and reducing anthropogenic greenhouse gas emissions. The structural applications of lightweight magnesium and aluminum alloys in the aerospace and automotive sectors unavoidably involve welding and joining while guaranteeing the safety and durability of motor vehicles. The objective of this study was to evaluate the lap shear strength and fatigue properties of friction stir spot welded (FSSWed) dissimilar AZ31B-H24 Mg alloy and Al alloy (AA) 5754-O in three combinations, i.e., (top) Al/Mg (bottom), Al/Mg with an adhesive interlayer, and Mg/Al with an adhesive interlayer. For all the dissimilar Mg-to-Al weld combinations, FSSW induced an interfacial layer in the stir zone (SZ) that was composed of intermetallic compounds of Al3Mg2 and Al12Mg17, which led to an increase in hardness. Both Mg/Al and Al/Mg dissimilar adhesive welds had significantly higher lap shear strength, failure energy and fatigue life than the Al/Mg dissimilar weld without adhesive. Two different types of fatigue failure modes were observed. In the Al/Mg adhesive weld, at high cyclic loads nugget pull-out failure occurred due to fatigue crack propagation circumferentially around the nugget. At low cyclic loads, fatigue failure occurred in the bottom Mg sheet due to the stress concentration of the keyhole leading to crack initiation followed by propagation perpendicular to the loading direction. In the Mg/Al adhesive weld, nugget pull-out failure mode was primarily observed at both high and low cyclic loads. © 2012 Elsevier B.V.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace
Peer reviewedYes
NPARC number21269774
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Record identifier9a4f782c-d482-42e7-8f17-ba933674c0b3
Record created2013-12-13
Record modified2016-05-09
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