Abstract
Cast aluminum alloys are generally heat treated to the T6 condition in order to obtain an optimum combination of strength and ductility. The improvement in strength properties after the heat treatment has been attributed primarily to the precipitation of Mg2Si during the aging treatment. The precipitation sequence in A356 alloys is as follows: needle shaped GP zones → rod like precipitates → eqilibrium platelets of Mg2Si. The precipitation characteristics are determined by several parameters including natural aging time, preaging time and temperature, heating rate to the final aging temperature and artificial aging time and temperature. The influence of these parameters on tensile properties of A356 alloys has been studied to determine optimum aging conditions necessary to obtain the desired property level. The data have been used to construct a TTT diagram for the aging process.
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