Formation mechanism of the abnormal texture during extrusion in Mg-Y-Sm-Zn-Zr alloy
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in: Journal of Alloys and Compounds, Jahrgang 821, 153477, 25.04.2020.
Publikation: Beiträge in Zeitschriften › Zeitschriftenaufsätze › Forschung › begutachtet
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TY - JOUR
T1 - Formation mechanism of the abnormal texture during extrusion in Mg-Y-Sm-Zn-Zr alloy
AU - Lyu, Shaoyuan
AU - Xiao, Wenlong
AU - Li, Guodong
AU - Xia, Dabiao
AU - Huang, Yuanding
AU - Gavras, Sarkis
AU - Hort, Norbert
AU - Zheng, Ruixiao
AU - Ma, Chaoli
PY - 2020/4/25
Y1 - 2020/4/25
N2 - An abnormal texture with c axis of the grains parallel to extrusion direction (ED) was found in extruded Mg–Y-Sm-Zn-Zr alloy. The mechanisms for the formation of this abnormal texture were investigated based on the dynamic recrystallization (DRX) mechanisms and deformation modes during extrusion using electron backscatter diffraction (EBSD) and a viscoplastic self-consistent (VPSC) model. The microstructure evolution during extrusion indicated that the abnormal <0001>//ED texture was dominated by DRX grains. With the strain increasing, the intensity of this texture enhanced. Based on the EBSD results analysis, discontinuous dynamic recrystallization (DDRX) played the dominated role in nucleation of the new grains at the initial stage and then continuous dynamic recrystallization (CDRX) was activated at high strain. The formation of abnormal <0001>//ED texture was attributed to the activation of slips and it could promote the rotation of c-axis of grains to ED, which contributed to the formation of <0001>//ED texture. The simulated texture predicated that the CRSS of basal slip was higher than that of pyramidal slip, which played an important role in contributing the formation of the <0001>//ED texture component.
AB - An abnormal texture with c axis of the grains parallel to extrusion direction (ED) was found in extruded Mg–Y-Sm-Zn-Zr alloy. The mechanisms for the formation of this abnormal texture were investigated based on the dynamic recrystallization (DRX) mechanisms and deformation modes during extrusion using electron backscatter diffraction (EBSD) and a viscoplastic self-consistent (VPSC) model. The microstructure evolution during extrusion indicated that the abnormal <0001>//ED texture was dominated by DRX grains. With the strain increasing, the intensity of this texture enhanced. Based on the EBSD results analysis, discontinuous dynamic recrystallization (DDRX) played the dominated role in nucleation of the new grains at the initial stage and then continuous dynamic recrystallization (CDRX) was activated at high strain. The formation of abnormal <0001>//ED texture was attributed to the activation of slips and it could promote the rotation of c-axis of grains to ED, which contributed to the formation of <0001>//ED texture. The simulated texture predicated that the CRSS of basal slip was higher than that of pyramidal slip, which played an important role in contributing the formation of the <0001>//ED texture component.
KW - Dislocation
KW - Mg alloy
KW - Recrystallization
KW - Simulation
KW - Texture
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=85077059301&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2019.153477
DO - 10.1016/j.jallcom.2019.153477
M3 - Journal articles
AN - SCOPUS:85077059301
VL - 821
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
M1 - 153477
ER -