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Chinese Science Bulletin

, Volume 56, Issue 1, pp 89–95

First Online: 03 November 2010Received: 22 March 2010Accepted: 09 June 2010

Abstract

The dynamic solidification of Sn-38.1% Pb eutectic alloy within an ultrasonic field is investigated at a frequency of 35 kHz. As the sample height H is reduced, the effect of ultrasound on macrosegregation becomes more prominent, and the volume fraction of spherical eutectic cells increases correspondingly. When H equals the wavelength λ in liquid alloy, the introduction of ultrasound enlarges the distribution region of the primary Sn phase, but reduces the domains of the Sn-Pb eutectic and primary Pb phases. Meanwhile, a -dendritic-equiaxed- structural transition occurs in the primary Sn phase, and its grain size is significantly reduced within the ultrasonic field. Once H decreases to λ-2 and λ-4, the ultrasonic field promotes crystal nucleation and suppresses further undercooling of the bulk liquid alloy. Theoretical analyses indicate that the local high pressure induced by the cavitation effect and the stirring effect due to acoustic streaming are the main factors dominating the eutectic growth mechanism during dynamic solidification.

Keywordsultrasonic field eutectic growth spherical eutectic cell cavitation effect acoustic streaming This article is published with open access at Springerlink.com

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Autor: Wei Zhai - ZhenYu Hong - WenJun Xie - BingBo Wei

Fuente: https://link.springer.com/article/10.1007/s11434-010-4084-5







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