Ultrasonic effects on gas tungsten arc based wire additive manufacturing of aluminum matrix nanocomposite
Ultrasonic effects on gas tungsten arc based wire additive manufacturing of aluminum matrix nanocomposite
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DOI：
10.1016/j.matdes.2022.110393
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发表时间：
2022-01
影响因子：
8.4
通讯作者：
T. Wang;V. Mazánová;Xun Liu
中科院分区：
文献类型：
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作者：
T. Wang;V. Mazánová;Xun Liu
研究了一种新开发的AA7075/TiB2纳米金属基复合材料的超声辅助(UA)丝弧添加剂制造工艺。在沉积过程中，超声探头直接浸入局部熔池，并在弧后移动。对UA-WAAM样品进行了全面的实验研究，在相同的沉积参数下，UA-WAAM样品表现出了比传统WAAM样品更少的孔隙率、更细小的凝固结构和更少的团聚纳米颗粒分布等多方面的优势。这些改进的微观结构特征导致了UA-WAAM样品的力学性能提高，拉伸测试和硬度测量结果反映了这一点。UA进一步利用了纳米颗粒在形成等轴晶结构和强度贡献方面的优势，因为它们具有更好的分散性。超声对WAAM过程的影响主要归因于两种非线性物理现象：声空化和功率超声在熔体中诱导的流动。
This study focused on a newly developed ultrasonically assisted (UA) wire arc additive manufacturing (WAAM) process for metal matrix nanocomposite of AA7075 with TiB2nanoparticles. The ultrasonic probe was directly dipped into the local molten pool and traveled behind the arc during deposition. Comprehensive experimental studies were performed and the UA-WAAM sample showed superiorities over conventional WAAM ones in multiple perspectives including a lower number of porosities, refined solidification structure, and less agglomerated nanoparticle distribution under the same deposition parameters. These improved microstructure features led to enhanced mechanical properties of the UA-WAAM samples, as reflected in the tensile tests and hardness measurement results. The benefits of nanoparticles in the formation of equiaxed grain structures and strength contribution was further leveraged by UA based on their better dispersion. The ultrasonic effects on WAAM process can be mainly attributed to the two nonlinear physical phenomena: acoustic cavitation and streaming induced by power ultrasound in molten metal.