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首页> 外文期刊>Journal of Manufacturing Processes >Effect of ultrasound on microstructure evolution of friction stir welded aluminum alloys
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Effect of ultrasound on microstructure evolution of friction stir welded aluminum alloys

机译：超声对摩擦搅拌焊铝合金微观结构演化的影响

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摘要

The dynamic recrystallization (DRX) in ultrasound affected friction stir welding (UFSW) was investigated using Al-Cu alloy and compared with another joint produced by the same setup but without applying the ultrasound. The effect of the ultrasound on the evolution of recrystallized grains was significantly dependent on the local thermal cycle. For the stir zone (SZ) exposed to high temperatures, both the nucleation rate and growth rate of equiaxed grains during DRX were significantly promoted by the ultrasound. Compared with the SZ without the effect of the ultrasound, the bulging frequency of the local high angle boundaries in the SZ of UFSW joint was increased to 2-4 times, producing a considerable number of fine nuclei. Excess vacancies introduced by the ultrasound were the intrinsic reason for the mentioned phenomena. The sub-grain mobility was radically accelerated due to the enhanced dislocation climb by the excess vacancies and thus the normalized nucleation criterion in the UFSW was reduced, contributing to a larger nucleation rate during DRX. Grain boundary sliding and migration were both facilitated by the ultrasound due to the enhanced movement of grain boundary dislocations and grain boundary self-diffusion, leading to a larger growth rate of equiaxed grains in the SZ of UFSW joint.
机译：使用Al-Cu合金研究超声波受影响的摩擦搅拌焊接（UFSW）中的动态再结晶（DRX），并与通过相同设置产生的另一个接头进行比较但不施加超声波。超声波对再结晶晶粒的效果显着取决于局部热循环。对于暴露于高温的搅拌区（SZ），通过超声波显着促进了DRX期间等轴晶粒的成核速率和生长速率。与SZ而没有超声波的影响相比，UFSW接头SZ中局部大角度边界的凸出频率增加到2-4次，产生相当数量的细胞核。超声引入的超额空位是所提到的现象的内在原因。由于过量空位，亚谷物迁移率是完全加速的，因此通过过量的空位，因此降低了UFSW中的标准化成核标准，促进了DRX期间的成核速率较大。由于晶界脱位和晶界自扩散的增强，超声波均促进了晶界滑动和迁移，导致UFSW关节的SZ中等轴谷物的较大增长速率。

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