Thixocasting process of an alloy material

Details Thixocasting process of an alloy material Thixocasting process of an alloy material

1997-10-22

2000-04-25

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148550, 148438, 148439, 164900, B21D 2100

Patent

active

060539976

ABSTRACT:
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 <T.ltoreq.T.sub.4 in the relationship between the temperature T.sub.1 of a rise-start point in the first angled endothermic section and the temperature T.sub.4 of a peak of the second angled endothermic section. At the primary pressing stage, the charging of the material into the cavity in a casting mold is completed. A start point of a secondary pressing stage is established at a point when the temperature T of the material is in a range of T.sub.1 <T.ltoreq.T.sub.3 in the relationship between the temperature T.sub.1 of the rise-start point in the first angled endothermic section and the temperature T.sub.4 of a drop-end point in the first angled endothermic section. At the secondary pressing stage, the material is solidified.

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