Microstructure evolution and mechanical properties of the Mg–5Al–1Mn-0.5Zn-xCa alloys prepared by regular extrusion

Improving the Mechanical Properties of Mg-5Al-2Ca-1Mn-0.5Zn Alloy through Rotary Swaging

“…The EDS results in Figure 3 b are shown in Table 1 , and the positions in the table correspond to Figure 3 b. Combined with the XRD results shown in Figure 3 c, it can be determined that these white second-phase particles are mainly composed of Al 8 Mn 5 , with a relatively small amount of (Mg, Al) 2 Ca [ 22 , 34 ].…”

“…The original grain size after extrusion is ca. 2.42 μm, and more details can be found in our previous study [ 34 ]. Compared with the as-extruded AXMZ5210 alloy [ 34 ], the grain size of the alloy is further refined after RS ( Figure 2 c,d).…”

“…2.42 μm, and more details can be found in our previous study [ 34 ]. Compared with the as-extruded AXMZ5210 alloy [ 34 ], the grain size of the alloy is further refined after RS ( Figure 2 c,d). The average grain size in the central and peripheral areas of RS is reduced by 22.3% and 31.8%, respectively, from the original extruded alloy.…”

“…Our previous study [ 34 ] showed that the as-extruded AXMZ5210 alloy has more second-phase particles. However, the number of white second-phase particles in the SEM images of the as-swaged AXMZ5210 alloy shown in Figure 3 a,b are extremely small.…”

“…It can be seen that the proportion of low-angle grain boundaries (LAGBs, 2° ≤ θ ≤ 15°) in the peripheral area (30.3%) is significantly higher than that in the central area (27.1%). The proportion of LAGBs in the as-extruded AXMZ5210 alloy is only 11.4% [ 34 ]. Generally, the low-angle misorientations are mainly the result of dislocation activity, which means that the higher the proportion of LAGBs, the higher the dislocation density [ 17 , 27 ].…”