Patent ID: 7452430
Filing Date: 2008-11-18
Classification: C22F

Abstract:
1. A method for reforming mechanical characteristics of an Al alloy casting by subjecting the Al alloy casting to the action of temperature and pressure, said method comprising the steps of: introducing the Al alloy casting into an HIP apparatus capable of withstanding HIP pressure therein, subjecting said Al alloy casting to a high temperature/high pressure HIP treatment in the HIP apparatus, reducing the pressure in the HIP apparatus while maintaining the temperature of the thus-treated Al alloy casting in the HIP apparatus at about the same temperature as the temperature of the high temperature/high pressure treatment, and subsequently carrying out solution treatment, quenching, and aging in this order, wherein a heat insulating structure is provided, said Al alloy casting is accommodated in the interior of said heat insulating structure and is then introduced in the HIP apparatus and subjected in this state to said high temperature/high pressure HIP treatment and said solution treatment.