Clustering and precipitation in Al-Mg-Si alloys during linear heating  

作　　者：Zi Yang Igor Erdle Chunhui Liu John Banhart 

机构地区：[1]Helmholtz-Centre Berlin for Materials and Energy,Hahn-Meitner-Platz 1,Berlin 14109,Germany [2]State Key Laboratory of High-Performance Complex Manufacturing,Central South University,Changsha 410083,China

出　　处：《Journal of Materials Science & Technology》2022年第25期78-88,共11页材料科学技术（英文版）

基　　金：supported by the Open Research Fund (No. Kfkt2018-01) of the State Key Laboratory of High Performance Complex Manufacturing at the Central South University;National Natural Science Foundation of China (No. U2032117)。

摘　　要：Differential scanning calorimetry(DSC) is a technique extensively applied to analyse precipitation phenomena in Al-Mg-Si alloys, yet the processes occurring during non-isothermal DSC heating, in particular the formation of clusters in the early stage and their evolution at higher temperatures, remain obscure. Here, we carry out experiments not only to measure heat(via DSC) but also to measure hardness,positron lifetime, electrical resistivity and microstructure of an Al-Mg-Si alloy heated at 3 different rates.Electrical resistivity is measured in situ, the other properties after interrupting the heating process. It is demonstrated that the precipitation process during heating can be divided into various stages, with transition temperatures depending on the heating rate, but the relative behavior of the various measured quantities is connected in the same way. Quenched-in excess vacancies are found to play an important role in cluster formation at lower temperatures, which explains the seeming peculiarity that linear heating at lower temperatures can lead to stronger clustering than isothermal ageing at a higher temperature.These trends are well simulated using a recently developed precipitation model. New aspects about the evolution of these clusters at higher temperatures are revealed by correlating the different measured properties. The methodology applied here could also be extended to investigating more complex nonisothermal heat treatments.

关 键 词：Al alloys AL-MG-SI Non-isothermal ageing Linear heating Precipitation hardening Solute clustering VACANCIES 

分 类 号：TG146.21[一般工业技术—材料科学与工程]