초록 ▼

In carrying out of a thixocasting process, a material in a semi-molten state is produced by heating an aluminum alloy material which has a thermal characteristic that a first angled endothermic section generated by the melting of a eutectic crystal and a second angled endothermic section generated b

In carrying out of a thixocasting process, a material in a semi-molten state is produced by heating an aluminum alloy material which has a thermal characteristic that a first angled endothermic section generated by the melting of a eutectic crystal and a second angled endothermic section generated by the melting of a component having a melting point higher than an eutectic point exist in a differential calorimetric curve. A start point of a primary pressing stage is established at a point when the temperature T of the material is in a range of T.sub.1

대표청구항 ▼

[ What is claimed is:] [1.] A thixocasting process for producing an aluminum alloy cast product comprising the steps of:preparing a thixocasting Al--Cu--Si based alloy material which has a thermal characteristic such that a differential scanning calorimetry (DSC) of the alloy material produces a dif

[ What is claimed is:] [1.] A thixocasting process for producing an aluminum alloy cast product comprising the steps of:preparing a thixocasting Al--Cu--Si based alloy material which has a thermal characteristic such that a differential scanning calorimetry (DSC) of the alloy material produces a differential calorimetric curve having a first angled endothermic section generated by the melting of a eutectic crystal CuAl.sub.2, and a second angled endothermic section generated by the melting of a primary crystal .alpha.-Al, said alloy material having a Si content set in a range of 0.01% by weight.ltoreq.Si.ltoreq.1.5% by weight, an Fe content of Fe.ltoreq.0.2% by weight, and at least one additive element selected from the group consisting of Mn, V, Zr and Ti, wherein an Mn content is set in a range of 0.2% by weight.ltoreq.Mn.ltoreq.0.4% by weight, a V content is set in a range of 0.05% by weight.ltoreq.V.ltoreq.0.15% by weight, a Zr content is set in a range of 0.1% by weight.ltoreq.Zr.ltoreq.0.25% by weight, and a Ti content is set in a range of 0.02% by weight.ltoreq.Ti.ltoreq.0.1% by weight;subjecting said alloy material to a heat treatment to produce a semi-molten alloy material with said additive element causing a fine division of the primary crystal .alpha.-Al; andcharging and pressing said semi-molten alloy material into a cavity in a casting mold for thixocasting the aluminum alloy cast product.