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采用电子背散射衍射(EBSD)技术,研究经高温大挤压比成形的AA3003铝合金微通道扁管横纵截面的晶粒分布、晶粒度统计和择优取向。结果表明,铝合金扁管的横截面和纵截面晶粒均呈等轴状,椭圆的长短轴比均约1.7左右。横截面平均晶粒尺寸约34.4μm,纵截面的平均晶粒尺寸约41.2μm。扁管沿挤压方向未观察到挤压变形带和焊合线。此外,铝合金微通道扁管织构为弱立方织构(100)[001]混合沿着挤压方向强高斯织构(110)[001]。并且经过高温严重塑性变形铝合金的微通道扁管的组织为再结晶组织,晶粒呈椭球状,顺着挤压方向略有拉伸,并生成典型铝合金再结晶织构。
The electron backscatter diffraction (EBSD) technique was used to study the grain size distribution, grain size statistics and preferred orientation in the transverse and longitudinal cross sections of AA3003 aluminum alloy microchannel flat tubes molded by high temperature and high extrusion ratio. The results show that the cross section and longitudinal section grains of aluminum alloy flat tube are equiaxed, the ratio of the major to minor axis of the ellipse is about 1.7. The average grain size of the cross section is about 34.4 μm and the average grain size of the longitudinal cross section is about 41.2 μm. Flat tube along the extrusion direction is not observed in the extrusion zone and welding line. In addition, the microchannel aluminum tube microchannel texture is weakly cubic texture (100) [001] mixed with strong Gaussian texture (110) [001] along the extrusion direction. And the microstructures of microchannel flat tubes after severe plastic deformation of high temperature are recrystallized, the grains are ellipsoidal, slightly stretched along the extrusion direction, and the typical recrystallization texture of aluminum alloy is formed.