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alloys containing alloys freezing aluminium alloys Assoc carbon casting proper chill face compound gases cooling curves degasification degassing deoxidants diffusion dissolved gas downgate effect external shrinks favourable temperature gradient feeder cavities feeding liquid feeding property filling the mould flow of feeding freezing range freezing shrinkage gas absorption gas porosity gas unsoundness grain refinement hot tears hydrogen inert gas ingot interdendritic channels magnesium Metals and Alloys method molten metal mould material mould temperature mould wall nickel silvers occur partial pressure phosphorus pouring speed pouring temperature pressure tightness primary crystals promote pure metals rapid solidification rate of solidification reactants reaction reaction-gas unsoundness residual liquid resultant Sand Cast sectional thickness shown in Fig shrinkage cavities shrinkage defects shrinkage porosity solid and liquid solidifica solidus solubility solute element sulphur sulphur dioxide surface tension thermal capacity thermal conductivity tin bronzes tion treatment viscosity volume changes W. A. Baker zone