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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Parameters Controlling Microstructure and Hardness during Friction-Stir Welding of Precipitation-Hardenable Aluminum Alloy 6063
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Parameters Controlling Microstructure and Hardness during Friction-Stir Welding of Precipitation-Hardenable Aluminum Alloy 6063

机译：易沉淀析出铝合金6063搅拌摩擦焊接时控制组织和硬度的参数

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摘要

The aluminum (Al) alloys 6063-T5 and T4 were friction-stir welded at different tool rotation speeds (R), and then distributions of the microstructure and hardness were examined in these welds. The maximum temperature of the welding thermal cycle rose with increasing R values. The recrystallized grain size of the weld increased exponentially with increasing maximum temperature. The relationship between the grain size and the maximum temperature satisfied the static grain-growth equation. In the as-welded condition, 6063-T5 Al was softened around the weld center, whereas 6063-T4 Al showed homogeneous hardness profiles. Different R values did not result in significant differences in the hardness profile in these welds, except for the width of the softened region in the weld of 6063-T5 Al. Postweld aging raised the hardness in most parts of the welds, but the increase in hardness was small in the stir zone produced at the lower R values. Transmission electron microscope (TEM) observations detected a similar distribution of the strengthening precipitates in the grain interiors and the presence of a precipitation-free zone (PFZ) adjacent to the grain boundaries in all the welds. Microstructural analyses suggested that the small increase in hardness in the stir zone produced at the lower R values was caused by an increase in the volume fraction of PFZs.
机译：以不同的工具转速（R）搅拌摩擦焊接铝（Al）合金6063-T5和T4，然后检查这些焊缝的组织和硬度分布。焊接热循环的最高温度随着R值的增加而上升。焊缝的再结晶晶粒尺寸随最高温度的升高呈指数增长。晶粒尺寸与最高温度之间的关系满足静态晶粒生长方程。在焊接状态下，6063-T5 Al在焊接中心周围软化，而6063-T4 Al显示出均匀的硬度分布。除了6063-T5 Al焊缝中软化区域的宽度外，不同的R值在这些焊缝中的硬度分布没有明显差异。焊后时效提高了焊缝大部分部位的硬度，但在较低R值下产生的搅拌区，硬度的增加很小。透射电子显微镜（TEM）观察发现，在所有焊缝中，强化沉淀物在晶粒内部的分布相似，并且在晶粒边界附近存在无沉淀区（PFZ）。显微组织分析表明，在较低的R值下，搅拌区硬度略有增加是由于PFZ的体积分数增加所致。

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