Author(s)

Xingzhi Liao^1,2, Yanxi Li^1,2, Pengxuan Dong^1,2, Kanghua Chen^1,2,3*

¹Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha, China.
²Collaborative Innovation Center of Advance Nonferrous Structural Materials and Manufacturing, Central South University, Changsha, China.
³Light Alloy Research Institute, Central South University, Changsha, China.

The influences of Cr on dispersed phase and properties of Al-Zn-Mg-Cu-Zr alloys were investigated by mechanical testing, slow strain rate stress corrosion, intergranular corrosion, combined with optical microscope, scanning electronic microscope, transmission electronic microscopy (OM, SEM, TEM). Research shows that: with the increase of element Cr, the recrystallization and grain growth had been inhibited, the strength, toughness and corrosion resistance of the alloy increased first and then decreased; when added 0.1 wt% Cr element, the properties of the alloy are the best. The main reasons of that were as below: when added 0.1 wt% Cr element, (Al,Cr)₃(Zr,Yb) appeared, that cohered with the matrix. When added 0.18 wt% Cr element, (Al,Cr)₃(Zr,Yb) and Al₁₈Mg₃Cr₂ had been found, making adverse effects on alloys. This work studied the effect of Cr content on recrystallization and grain growth in order to get a new super high strength aluminum alloy.

Al-Zn-Mg-Cu-Zr Alloys, Chromium, Dispersed Phase, Property

Liao, X. , Li, Y. , Dong, P. and Chen, K. (2020) Effect of Minor Cr Additions on Dispersed Phase and Properties of Al-Zn-Mg-Cu-Zr Alloys. Journal of Materials Science and Chemical Engineering, 8, 27-36. doi: 10.4236/msce.2020.82004.