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- W2559651010 abstract "Semisolid metal processing (SSMP) is of growing industrial significance particularly for magnesium and aluminium alloys. SSMP requires a binary micro-structure in which the primary phase is approaching a spheroidal (globular or non-dendritic) shape. Traditionally this is achieved by stirring the alloy in the mushy state. An alternative method, which is gaining popularity, is the so-called slurry-on-demand or new rheocasting process in which solidification conditions are controlled via active thermal management to yield non-dendritic solid in a liquid matrix. The authors present here a novel low-cost process, the direct thermal method (DTM), in which a globular microstructure, suitable for SSMP, is achieved via the naturally occurring thermal environment in a very simple casting experiment. Basically the DTM is a process in which liquid alloy of low superheat is poured into a cylindrical metallic mould of very low thermal mass but high thermal conductivity. Heat-matching between alloy and mould results in a pseudo-isothermal hold within the solidification range of the alloy, made possible by the very low rate of heat loss to the environment. Without the use of any special insulation or heating devices, the fraction solid during the experiment and the hold time can be modified by simple alterations to the process variables and geometry. The thin mould walls also make quenching easy. The resultant alloy morphology is characterised for an aluminium alloy designation A356. IJCMR/463" @default.
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- W2559651010 date "2003-10-01" @default.
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- W2559651010 title "Direct thermal method: new process for development of globular alloy microstructure" @default.
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- W2559651010 doi "https://doi.org/10.1080/13640461.2003.11819618" @default.
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