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Date of Publication:2013-01-01

Journal:Transactions of Nonferrous Metals Society of China

Affiliation of Author(s):材料科学与工程学院

Volume:23

Issue:11

Page Number:3242-3248

ISSN No.:1003-6326

Abstract:At the late stage of solidification with ultrasonic treatment (UST) in Al-Si alloys, a part of semisolid overflows and climbs along the probe. The interesting phenomenon and its influence on the solidification microstructure were investigated in order to better study the mechanism of UST. It is considered that the overflowing phenomenon occurs due to the changes of vibration and flow in the remaining semisolid. Because the overflowed portion comes from the region with intense UST effect and vibrates with the probe during solidification, great modification of primary and eutectic Si (about 10μm in length) and refinement of primaryα(Al) (about 70μm in size) are observed in this portion.

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