Microstructure and texture evolution of differential speed rolled Mg-3Zn-2(Ce/La)-1Mn alloy

doi:10.13251/j.issn.0254-6051.2020.02.001

Abstract

Abstract:

In order to investigate the microstructure and texture evolution of magnesium alloy subjected to differential speed rolling (DSR) with different speed ratios, four different speed ratios were carried out on extruded Mg-3Zn-2(Ce/La)-1Mn alloys. The results indicate that the more uniform and finer microstructure is obtained after DSR compared to the initial extruded specimen. With the increment of SR, the amount of recrystallized grains increases, the size of grains and secondary phase particles are reduced, then the extent of homogenization of microstructure is improved. There are mainly two kinds of second phases in the sample, namely α-Mn phase and Mg_xZn_y-Mn-(Ce/La) phase. The <c+a> pyramidal slip and the basal <a> slip both play a major role during DSR. The basal plane orientation is inclined by 30°-45° from the RD toward the TD, and the texture gradually trends to be randomized. The introduction of intensive shear strain, trigger of the <c+a> pyramidal slip and tilting of basal poles have a significant effect on the randomization of the texture.

Key words: Mg alloy, differential speed rolling, microstructure, texture

CLC Number:

TG339

Song Xudong, Yuan Gecheng, Li Xiaohui, Feng Longbiao. Microstructure and texture evolution of differential speed rolled Mg-3Zn-2(Ce/La)-1Mn alloy[J]. HTM, 2020, 45(2): 1-6.

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