此外，文中还研究了淬火、回火或循环热处理对该复合材料硬度值的影响。
Moreover, the effect of quenching, tempering or cycling heat treatment on the hardness values of the composite is also studied.
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 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.
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