Effect of low-intensity ultrasound on grain refinement and heterogeneous nucleation mechanism of 2219 Al alloy.

ABSTRACT: The ultrasonic cavitation and acoustic streaming have long been regarded as the dominant mechanisms for refining the solidification microstructure of Aluminum (Al) alloys. This work investigated the effects of low-intensity ultrasound on the solidification microstructure of 2219 Al alloy by setting an ultrasonic application angle of 15° and with the different depths (30 mm, 70 mm, and 110 mm). The experimental results show that low-intensity ultrasound can also achieve a significant refining effect on the microstructure. Comparative analysis of solidified microstructures across multiple samples revealed, for the first time, that low-intensity ultrasound refines grain morphology primarily through enhanced heterogeneous nucleation. By establishing a theoretical model between acoustic intensi

SUBMITTER: Li A 

PROVIDER: S-EPMC12003017 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature