Effects of homogenization temperature on microstructure and mechanical properties of high-speed-extruded Mg–5Bi–3Al alloy

A New Extruded Mg-6Bi-3Al-1Zn Alloy with Excellent Tensile Properties

“…In addition, some fine Mg 17 Al 12 precipitates were also identified according to the results of SADP in Figure 4e, which is quite different with the as-extruded BAZ811 alloy only containing Mg 3 Bi 2 precipitates. The distribution of these fine Mg 3 Bi 2 particles both at GBs and within grain interiors indicates that dynamic precipitation occurred during high-speed extrusion at 300 • C, which is well agreed with recent research on low-speed extruded Mg-Bi binary alloys [7,8] and high-speed extruded Mg-Bi-Al alloy [18,19]. As a typical precipitation-hardenable Mg alloy system, the solubility of Bi in Mg at the homogenization treatment temperature (450 • C) in this study is about 5 wt.%, which decreases nearly to 0 wt.% at extrusion temperature (300 • C) [4,7].…”

Microstructure and mechanical properties of as-cast and wrought Mg–Ni in-situ formed alloys

“…However, the poor ductility of polycrystalline Mg (resulting from the HCP crystal structure with few slip systems) and their relatively lower strength compared to other competing alloys are the major obstacles in this regard. The research community has addressed these issues via alloying [4][5][6], heat treatment [7][8][9], thermomechanical processing [10][11][12][13], severe plastic deformation [14][15][16], and introducing reinforcing particles [17][18][19][20]. In fact, the properties of Mg-based alloys and composites are controlled by the fabrication method, morphology and volume fraction of reinforcements, the grain size of the matrix, and secondary thermomechanical processing [21].…”