Al-Mg-Si Heat treatment method of Al-Mg-Si alloy

摘要

According to one embodiment of the present invention, provided is a heat treatment method of an Al-Mg-Si alloy comprising a step of determining a time and a temperature condition of a natural aging of the Al-Mg-Si alloy, a step of preparing the Al-Mg-Si alloy by selecting an Mg/Si content ratio according to the determined time and temperature conditions of natural aging, a step of determining a time and a temperature condition of a preliminary aging according to the determined time and temperature conditions of natural aging, a step of solutionizing the Al-Mg-Si alloy, a step of quenching the solutionized alloy, and a step of pre-aging the quenched alloy according to the determined time and temperature conditions of the preliminary aging, thereby capable of providing a suitable Al-Mg-Si alloy plate material for a vehicle exterior plate.