TY - JOUR
T1 - Effects of extrusion parameters on the microstructure and mechanical properties of Mg-Zn-(Mn)-Ce/Gd alloys
AU - Park, Sung Hyuk
AU - You, Bong Sun
AU - Mishra, Raja K.
AU - Sachdev, Anil K.
PY - 2014/3/26
Y1 - 2014/3/26
N2 - The effects of extrusion parameters on the microstructure and tensile properties of the Mg-2Zn-0.5Ce, Mg-1Zn-1Mn-0.5Ce, and Mg-2Zn-1.5Gd alloys were investigated by conducting indirect extrusion at different temperatures, ram speeds, and extrusion ratios. All of the extruded alloys exhibited a bimodal grain structure composed of equiaxed fine recrystallized (DRXed) grains and elongated coarse unDRXed grains, except for some alloys extruded at a high temperature and a fast speed. With an increase in the temperature, speed, and ratio of extrusion, the average size and area fraction of the DRXed grains increased as a result of the temperature rise at the deformation zone caused by deformation heating. The yield strength increased with a decrease in the size of the DRXed grains according to the Hall-Petch relation, while the elongation increased with an increase in the fraction of the DRXed grains due to the suppression of {10-11}-{10-12} double twinning, irrespective of alloy composition. Due to these relationships between the microstructural characteristics and tensile properties, the yield strength decreased but the elongation increased when the temperature, speed, and ratio were increased.
AB - The effects of extrusion parameters on the microstructure and tensile properties of the Mg-2Zn-0.5Ce, Mg-1Zn-1Mn-0.5Ce, and Mg-2Zn-1.5Gd alloys were investigated by conducting indirect extrusion at different temperatures, ram speeds, and extrusion ratios. All of the extruded alloys exhibited a bimodal grain structure composed of equiaxed fine recrystallized (DRXed) grains and elongated coarse unDRXed grains, except for some alloys extruded at a high temperature and a fast speed. With an increase in the temperature, speed, and ratio of extrusion, the average size and area fraction of the DRXed grains increased as a result of the temperature rise at the deformation zone caused by deformation heating. The yield strength increased with a decrease in the size of the DRXed grains according to the Hall-Petch relation, while the elongation increased with an increase in the fraction of the DRXed grains due to the suppression of {10-11}-{10-12} double twinning, irrespective of alloy composition. Due to these relationships between the microstructural characteristics and tensile properties, the yield strength decreased but the elongation increased when the temperature, speed, and ratio were increased.
KW - Dynamic recrystallization
KW - Extrusion
KW - Magnesium alloy
KW - Tensile properties
UR - https://www.scopus.com/pages/publications/84893654665
U2 - 10.1016/j.msea.2014.01.051
DO - 10.1016/j.msea.2014.01.051
M3 - Article
AN - SCOPUS:84893654665
SN - 0921-5093
VL - 598
SP - 396
EP - 406
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
ER -