Establishment of Constitutive Model and Analysis of Dynamic Recrystallization Kinetics of Mg-Bi-Ca Alloy during Hot Deformation

Abstract

The flow behavior of the solution-treated Mg-3.2Bi-0.8Ca (BX31, wt.%) alloy was systematically investigated during hot compression at different deformation conditions. In the present study, the strain-related Arrhenius constitutive model and dynamic recrystallization (DRX) kinetic model were established, and the results showed that both two models had high predictability for the flow curves and the DRX behavior during hot compression. In addition, the hot processing maps were also made to confirm a suitable hot working range. Under the assistance of a hot processing map, the extrusion parameters were selected as 573 K and 0.5 mm/s. After extrusion, the as-extruded alloy exhibited a smooth surface, a fine DRX structure with weak off-basal texture and good strength–ductility synergy. The newly developed strong and ductile BX31 alloy will be helpful for enriching low-cost, high-performance wrought Mg alloy series for extensive applications in industries.

Effect of Bi Addition on the Heat Resistance of As-Extruded AZ31 Magnesium Alloy

“…Therefore, we can conclude that DRX may be preferred over dynamic precipitation of fine Mg 3 Bi 2 phases during extrusion with Bi addition, weakening the Zener drag effect and resulting in a similar average grain size in both as-extruded alloys. To a certain extent, the degree of DRX determines the texture during hot deformation [ 26 , 27 ]. Hence, under the conditions of similar DRX behavior, both as-extruded alloys present almost the same basal fiber texture ( Figure 4 c,f).…”

Axis temperature anomaly data generation based on optimized generation network

“…Current axis temperature discrimination systems rely on infrared technology and work by comparing the train axis temperature measured by the probes in each monitoring station with the criteria for the specified train axis temperature classes [2] . The axis temperature states are categorized as normal (the difference between train axis temperature and ambient temperature is less than 40°C), slightly hot (the difference between train axis temperature and ambient temperature is between 40°C and 60°C), and strongly hot (the difference between train axis temperature and ambient temperature is greater than 60°C).…”

Research Progress in High-Performance Magnesium Alloy and Its Applications

“…It also presented yield isotropy (the ratio of compression yield strength/tensile yield strength along the forging direction was ≈1.0). Wang et al [3] investigated the flow behavior of solution-treated Mg-3.2Bi-0.8Ca (BX31, wt.%) alloy during hot compression under different deformation conditions, and made hot processing maps for confirming a suitable hot working range. With the assistance of a hot processing map, the as-extruded alloy exhibited a smooth surface, a fine DRX structure with weak off-basal texture, and good strength-ductility synergy.…”