Resistance spot weld fatigue behavior and dislocation substructures in two different heats of AZ31 magnesium alloy

Lap shear strength and fatigue life of friction stir spot welded AZ31 magnesium and 5754 aluminum alloys

“…4(a) and (b)). Similar results were also reported by Xiao et al [22,24] for resistance spot welding of a Mg alloy, where they observed that many unmelted Mn-Al (Al 8 Mn 5 ) second-phase particles resulted in effective nucleation sites, giving rise to a fine grain size in the fusion zone of the resistance spot weld.…”

“…In 1993, based on the linear lap FSW technique, Mazda Corporation of Japan proposed a friction stir spot welding (FSSW) process which has successfully been applied for the production of the hood and rear door of the sport vehicle Mazda RX-8 [8]. For aluminum and magnesium alloys, the conventional resistance spot welding process poses some technical issues, including weld porosity, electrode wear, high energy consumption, low production efficiency, and inconsistency in failure modes [19][20][21][22][23][24]. Therefore, the automotive industry is on the lookout for some alternative and relatively new methods, such as structural adhesives, rivets, and toggle-locks, to join aluminum and magnesium sheets.…”

Cyclic deformation and anelastic behavior of ZEK100 magnesium alloy: Effect of strain ratio

“…18(e). This was due to the occurrence of more extensive twinning, as confirmed by the presence of extensive residual twins at R ε ¼ À1, where twin boundaries became effective sources and traps for dislocations [71][72][73]. Keller et al [71] stated that geometrically necessary dislocations that have formed during fatigue in Mg alloys, can rearrange into low-energy structures (i.e., substructures), as observed from the histograms in Fig.…”

Resistance spot welding of AZ series magnesium alloys: Effects of aluminum content on microstructure and mechanical properties

“…Heterogeneous nucleation rate is reported to be increased by the addition of secondary phase particles with high melting point, which promotes columnar to equi-axed dendrite transition and grain refinement. This results in improvement of RSW strength due to increased resistance to crack initiation and propagation [20][21][22][23].…”