焊核区由于动态再结晶具有细小的等轴晶粒，旁边存在一个特殊的组织形貌——热机影响区域。
The fine grain and narrow HAZ were found in friction stir weld and the dynamic recrystallization produces fine grain.
焊核区发生动态再结晶，生成细小的等轴晶粒。
Dynamic recrystallization takes place in the weld nugget zone and fine grains are achieved.
退火后，孪晶逐渐消失，形成等轴的再结晶晶粒。
The twinning disappeared gradually and recrystallized grains formed after annealing.
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