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首页> 外文会议>Materials forum - aluminium alloys, their physical and mechanical properties - Volume 28 - 2004 >Microstructure of Friction Stir Welded 6061 Aluminum Alloy
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Microstructure of Friction Stir Welded 6061 Aluminum Alloy

机译：搅拌摩擦焊接6061铝合金的显微组织

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摘要

The variation in the microstructure of a friction stir welded 6061 aluminum alloy wasrnobserved by a metallographic technique, electron backscatter diffraction pattern (EBSD),rnoptical microscopy and transmission electron microscopy (TEM). At a low rotation speedrnand travel speed, the center portion of stir weld zone is dominated by a region deformedrnwith a wedge-shaped microstructure, particularly in the lower branches. EBSD and TEMrnindicated that many more low-angle grain boundaries were observed inrnthermo-mechanically affected zone (TMAZ), I.e., subgrains with a recovered grainrnstructure,. Friction heating and plastic flow during friction stir welding create finernrecrystallized grains and recovered grains in the TMAZ. The friction stir welding produces arnwedge-shaped portion and a softened region in the welded 6061 Al. In the stir zone,rnequiaxed grains were created and the grain size became very small in the bottom area.
机译：通过金相技术，电子背散射衍射图谱（EBSD），光学显微镜和透射电子显微镜（TEM）观察了搅拌摩擦焊接6061铝合金的显微组织变化。在低转速和行进速度下，搅拌焊接区的中心部分主要由具有楔形微观结构的变形区域主导，特别是在下部分支中。 EBSD和TEMrn表明，在热机械影响区（TMAZ），即具有恢复晶粒结构的亚晶粒中，观察到了更多的低角度晶粒边界。搅拌摩擦焊接过程中的摩擦加热和塑性流动会在TMAZ中产生细小的重结晶晶粒和回收晶粒。搅拌摩擦焊接在焊接的6061 Al中产生楔形的部分和软化区域。在搅拌区，产生菱形晶粒，底部区域的晶粒尺寸变得很小。

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