First-Principles Calculations, Thermodynamic Calculations and Kinetic Calculations of Ultra High Strength Aluminum Alloys of Al-Zn-Mg-Cu-Zr

摘要

The research for next generation of ultra high strength aluminum alloys is focused on materials of Al-Zn-Mg-Cu-Zr. In the present paper, the Al-Zn-Mg-Cu-Zr multi-component system was studied and the formation enthalpy of strengthening precipitate η', the phase diagram of Al-Zn-Mg-Cu-Zr, the TTT diagram and the CCT diagram calculated by using the methods of First-principles calculations, thermodynamic calculations and kinetic calculations. Based on calculated results, a set of compositions and hot process parameters including temperature zones of hot processes and critical cooling rate of solution treatment are obtained. The calculated results provide primary guidance to developing Al-Zn-Mg-Cu-Zr ultra high strength aluminum alloys.