期刊
ACTA METALLURGICA SINICA-ENGLISH LETTERS
卷 32, 期 6, 页码 710-718出版社
CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-018-0848-8
关键词
Magnesium alloys; Extrusion; Grain refinement; Texture evolution
资金
- National Natural Science Foundation of China [51505143, 51728202]
- Scientific Research Fund of Hunan Provincial Education Department [17B089]
- China Postdoctoral Science Foundation [2016T90759, 2014M562128]
AZ31 alloys were extruded by direct extrusion and bending-shear deformation (DEBS). The microstructure characteristic and texture evolution of DEBSed AZ31 sheets were investigated by electron backscattered diffraction (EBSD). It is found that DEBS technique could effectively refine grains and weaken texture. Besides, we also investigate how twinning affects dynamic recrystallization during hot extrusion. {10-12} extension twins can offer nucleation sites and enough energy to trigger dynamic recrystallization. Moreover, the character of direct extrusion and bending-shear die can lead to the activation of non-basal slip system and further dramatically weaken the basal texture of the microstructure with many pre-activated basal slip systems.
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