Thermodynamic analysis of 6xxx series Al alloys: Phase fraction diagrams

Journal of Mining and Metallurgy. Section B: Metallurgy

Mishra R.¹  Cui S.²  Jung I.-H.² 

[1] General Motors R&D Center, Warren, Michigan, USA;McGill University, Department of Mining and Materials Engineering, Montreal, Quebec, Canada;

关键词: Aluminum alloy;    Thermodynamic calculation;    Solidification;    Alloy design.;   

DOI  :  10.2298/JMMB170512052C

来源: DOAJ

【 摘 要 】

Microstructural evolution of 6xxx Al alloys during various metallurgical processes was analyzed using accurate thermodynamic database. Phase fractions of all the possible precipitate phases which can form in the as-cast and equilibrium states of the Al-Mg-Si-Cu-Fe-Mn-Cr alloys were calculated over the technically useful composition range. The influence of minor elements such as Cu, Fe, Mn, and Cr on the amount of each type of precipitate in the as-cast and equilibrium conditions were analyzed. Phase fraction diagrams at 500 °C were mapped in the composition range of 0-1.1 wt.% Mg and 0-0.7 wt.% Si to investigate the as-homogenized microstructure. In addition, phase fraction diagram of Mg2Si at 177 °C was mapped to understand the microstructure after final annealing of 6xxx Al alloy. Based on the calculated diagrams, the design strategy of 6xxx Al alloy to produce highest strength due to Mg2Si is discussed.

【 授权许可】

Unknown