Property of Al-Zn-Mg-(Cu) Alloy after Linear Heating Aging Treatment

Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》

曾苗霞 林振铭 李文涛 金曼

Abstract： Effect of linear heating aging process and the Cu content on the performance and the formation of precipitates of Al-Zn-Mg-(Cu) alloy was investigated by means of differential scanning calorimeter (DSC), hardness tester, transmission electron microscopy(TEM) and three- dimensional atom probe (3DAP). The results show that with the increase of the aging temperature the hardness rises firstly and then decreases after reaching a peak. After aging at every selected temperature of the linear heating aging treatment process, all the relevant hardness of the Al-Zn-Mg-Cu alloy is higher than that of the Al-Zn-Mg alloy. After aging at peak point by linear heating, the main precipitates are η' phase, while there exists small quantities of η phase and GP zone for the two alloys Al-Zn-Mg and Al-Zn-Mg-Cu. However the addition of Cu may induces certain change of the composition and morphology of the precipitates and delay their transition from metastable state to stable state.

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