Microstructures and mechanical properties of a hot-extruded Mg−8Gd−3Yb−1.2Zn−0.5Zr (wt%) alloy

Enhancing the Mechanical Properties of AZ80 Alloy by Combining Extrusion and Three Pass Calibre Rolling

“…Furthermore, the CRed AZ80 alloy still demonstrates a good ductility with the EL of 13%. Though the EL of CRed AZ80 is lower than that of as-extruded AZ80 sample (20%), the ductility of the CRed AZ80 fabricated here is much higher compared with those of other ultra-high strength Mg alloys [4,6,8,10,[12][13][14]19,21,[28][29][30][31]. Based on the above microstructure characterization results, the good comprehensive mechanical performance of the CRed AZ80 alloy can be mainly attribute to the necklace bimodal structure containing ultra-fine grains.…”

“…After three pass caliber rolling, the strength of the CRed AZ80 alloy was greatly enhanced with TYS and UTS being 370 MPa and 446 MPa, respectively, both much higher than those of the corresponding as-extruded sample. The comparison of CRed AZ80 in this study with the other recently developed high strength Mg alloys [4,6,[8][9][10][11][12][13][14]17,19,21,[28][29][30][31] is shown in Figure 9. The UTS of the CRed AZ80 sample are much higher than those previously reported high strength Mg-8Al-4Sn-2Zn [21], Mg-10Sn-1Al-1Zn [29], Mg-3.5Al-3.3Ca-0.4Mn [30], and Mg-2Sn-2Ca [28] alloys.…”

“…However, their poor mechanical performance inhibits their wider commercial application. A lot of researchers have devoted themselves into developing Mg alloys with good mechanical properties via alloying with rare-earth (RE) elements [3][4][5][6], processing by severe plastic deformation (SPD) [7,8] and some other modified processing technologies [9][10][11]. For example, it was reported that Mg-Gd-Y-Zn-Zr alloy having a tensile yield strength (TYS), an ultimate tensile strength (UTS), and an elongation (EL) of 473 MPa, 542 MPa, and 8.0%, respectively was successfully fabricated [6].…”

A New Ultra-High-Strength AB83 Alloy by Combining Extrusion and Caliber Rolling

“…In addition, the necklace bimodal microstructure with more random basal texture benefits from the glide dislocation on basal planes, which makes the CRed AB83 alloy more ductile [42,43]. As shown in Figure 9, even though the EL of CRed AB83 was lower than that of as-extruded AB83, the ductility of the first (~11.8%) was one of the highest recorded for ultra-high strength Mg alloys [4,5,10,11,15,16,19,20,[22][23][24][27][28][29]31,33,34,37,38]. Compared with the newly developed highstrength Mg-3.5Al-3.3Ca-0.4Mn [5] and Mg-2Sn-2Ca [31] alloys, which were reported to have the two highest YS among RE-free Mg alloys, the CRed AB83 alloy showed a slightly lower YS but a much greater EL.…”

“…The authors declare no conflicts of interest. Comparison of UTS vs. EL of CRed AB83 with those of previously reported wrought Mg alloys [4,5,10,11,15,16,19,20,[22][23][24][27][28][29]31,33,34,37,38] (E: extrusion; CR: caliber rolling; ECAP: equal channel angular pressing; HPR: hard-plate rolling; LTSS-E: low-temperature slow-speed extrusion; DE: double extrusion; HRDSR: high-ratio differential speed rolling; ARB: accumulative roll bonding; MDF: multidirectional forging).…”