Effect of heat treatment on tension–compression yield asymmetry of AZ80 magnesium alloy

Improving tensile and compressive properties of magnesium alloy rods via a simple pre-torsion deformation

“…Recently, it has found that refining grain size [1], alloying [2,3], weakening texture [4] and aging treatment [5,6] can be used to reduce the yield asymmetry. Alloying and aging treatment are only suitable for some magnesium alloys with special alloy components, such as AZ80 and Mg-Y-Gd-Zr alloys [2,3,5], which have limited the scope of application.…”

Improved mechanical properties of Mg–7.6Al–0.4Zn alloy through aging prior to extrusion

“…Among the various high-strength extruded Mg alloys developed to date, AZ80 alloy (Mg-8.0Al-0.5Zn, wt.%) is currently utilized commercially for engineering applications due to its combination of relatively low material cost, moderate strength, reasonable ductility and good corrosion resistance [2][3][4]. However, further improvement in the strength of extruded Mg alloys would allow them to provide a viable alternative to other commercially used materials such as Al alloys, steels, polymers and ceramics.It is already well known that the discontinuous (DP) and continuous (CP) Mg 17 Al 12 precipitates formed during the aging of Mg-Al-Zn alloys can provide an effective means to enhance the mechanical properties of extruded alloys [3][4][5][6][7][8][9]. For instance, Zhao et al [4] recently reported an improved tensile strength in extruded AZ80 alloy through a combination of solution and aging treatment, which was attributed to both DP precipitates generated at grain boundaries and CP precipitates in the grain interiors.…”

Study on the assemblage of Y and Gd on microstructure and mechanical properties of hot extruded Mg–Al–Zn alloy

“…These phenomena are attributed to the effect of Mg 17 Al 12 precipitates on the formation of {1012} twins under compression. In fact, twinning occurred less readily in the aged Mg-Al alloys and many researchers have reported that the precipitation of Mg 17 Al 12 can modify the process of twinning [36][37][38][39]. Gharghouri et al [36] observed that the β-Mg 17 Al 12 precipitates had a strong interaction of twins with inhibiting twin boundary migration, including cases of twins engulfing, by passing or impinging precipitates.…”

“…Subsequently, Jain et al [37] discovered that the tension-compression asymmetry varied as a function of precipitation state, which would alter the local boundary chemistry and could, therefore, affect the rate of twin formation. In addition, Lv et al [38] reported that the Mg 17 Al 12 precipitates in aged extruded AZ80 alloy could alter or inhibit twin growth and the back stress resulting from precipitates made twin finer, restrained the length of the twin and led to curved twin boundary if the stress was enough. Furthermore, Stanford et al [39] found that the twinning mode showed increased hardening with increased aging time and they also proposed that back stresses and hardening of the slip systems apart from Orowan hardening could contribute to precipitate hardening of the twin system.…”