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Evolution of microstructure in semi-solid slurries of rheocast aluminum alloy

Transactions of Nonferrous Metals Society of China 2010年第9期20卷 1649-1655页

作者： R.CANYOOK S.PETSUT S.WISUTMETHA NGOON M.C.FLEMINGS J.WANNASIN Department of Mining and Materials Engineering Faculty of EngineeringPrince of Songkla University Department of Mechanical Engineering Faculty of EngineeringPrince of Songkla University Department of Materials Science and Engineering Massachusetts Institute of Technology

Semi-solid metal processing is being developed in die casting applications to give several cost benefits. To efficiently apply this emerging technology, it is important to understand the evolution of microstructure in semi-solid slurries for the control of the theological behavior in semi-solid state. An experimental apparatus was developed which can capture the grain structure at different times at early stages to understand how the semi-solid structure evolves. In this technique, semi-solid slurry was produced by injecting fine gas bubbles into the melt through a graphite diffuser during solidification. Then, a copper quenching mold was used to draw some semi-solid slurry into a thin channel. The semi-solid slurry was then rapidly frozen in the channel giving the microstructure of the slurry at the desired time. Samples of semi-solid 356 aluminum alloy were taken at different gas injection times of 1, 5, 10, 15, 20, 30, 35, 40, and 45 s. Analysis of the microstructure suggests that the fragmentation by remelting mechanism should be responsible for the formation of globular structure in this rheocasting process.

关键词： microstructure evolution rheocasting rapid quenching method 356 aluminum alloy gas induced semi-solid (GISS) formation mechanism

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