Microstructural evolution and mechanical properties of binary Mg–xBi (x = 2, 5, and 8 wt%) alloys

A Superior High-Strength Dilute Mg-Bi-Ca Extrusion Alloy with a Bimodal Microstructure

“…According to the SEM and TEM images, it can be found that there are numerous nano-scale Mg 2 Ca, Mg 3 Bi 2 , and Mg 2 Bi 2 Ca precipitates and a small amount of micro-scale Mg 2 Bi 2 Ca and Mg 2 Ca particles in the as-extruded BX11 alloy. During hot extrusion, all of these nano-scale precipitates and fine micro-scale particles (~1 µm) can substantially retard DRX by greatly reducing the mobility of grain boundaries and inhibiting boundary bulging required for the nucleation of new DRXed grains, which is known as the Zener pinning effect [12,13]. On the one hand, this suppression of DRX eventually leads to partial dynamic recrystallization of the BX11 alloy, forming a bimodal structure.…”

“…Metals 2022, 12, x FOR PEER REVIEW 5 of 7 high strength can be expected in the BX11 alloy based on the ultra-fine DRXed grains, nano-particles including Mg2Ca Mg2Bi2Ca and Mg3Bi2, residual dislocations, and subgrain boundaries in its microstructure. The tensile properties including TYS, ultimate tensile strength (UTS), and EL of the as-extruded BX11 alloy are summarized in Table 1, compared with AZ31 [13] and some other typical RE-free Mg alloys [9,11,12]. The typical tensile stress-strain curves of the asextruded BX11 alloy are represented in Figure 5, compared with pure Mg and AZ31 extruded under similar conditions [13].…”

“…129 MPa, mainly because of the grain refinement and precipitation strengthening by fine Mg3Bi2 phases [11,12]. Additionally, Al, Zn, Sn, Ca, and Mn have been introduced into Mg-Bi-based alloys to improve their mechanical properties [13][14][15][16][17][18][19][20].…”

“…Recently, several Mg-Bi-based alloys with attractive mechanical properties have been fabricated. It is reported that, when 3-8% Bi is added to pure Mg, the TYS of the extruded samples can be increased by 88 MPa to 129 MPa, mainly because of the grain refinement and precipitation strengthening by fine Mg 3 Bi 2 2 of 7 phases [11,12]. Additionally, Al, Zn, Sn, Ca, and Mn have been introduced into Mg-Bibased alloys to improve their mechanical properties [13][14][15][16][17][18][19][20].…”

Effect of Al Addition on Grain Refinement and Phase Transformation of the Mg-Gd-Y-Zn-Mn Alloy Containing LPSO Phase

“…Magnesium (Mg) alloys have great application prospects in the automobile and aerospace sectors, by virtue of their low density and high specific strength [ 1 , 2 , 3 , 4 , 5 ]. However, some weaknesses, such as their low strength and poor ductility, greatly limit their extensive applications [ 6 ].…”