The diffusion zone width of main alloying elements increases and hardness of the friction weld zone near TC4 titanium alloy side improves after post-weld heat treatment.
经焊后回火热处理后，主要合金元素沿焊合区的扩散区宽度增大；焊合区钛合金侧硬度值显著提高。
The fine grain and narrow HAZ were found in friction stir weld and the dynamic recrystallization produces fine grain.
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。
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