Dilute Alloy Designs of 7xxx Aluminum Alloys for Thick Forging Applications

Seong Taek Lim; Yong Yun Lee; Il Sang Eun

doi:10.4028/www.scientific.net/MSF.475-479.369

Paper Titles

Microstructures and Thermal Stability of the Metastable-Phase Precipitates Formed in an Al-Cu Alloy
p.353

Nano-Scale Clusters Formed in the Early Stage of Phase Decomposition of Al-Mg-Si Alloys
p.357

Study of Precipitation Sequence in Al-Mg-Si Alloys by HRTEM
p.361

The Metastable Phase Responsible for Peak Hardness and Its Morphology in an Al-Mg-Si Alloy
p.365

Dilute Alloy Designs of 7xxx Aluminum Alloys for Thick Forging Applications
p.369

Deformation Behaviors of 6061 and 7075 Aluminum Tubes at Elevated Temperatures for Warm Hydroforming
p.373

Development of Horizontal Reheating System for Semi-Solid Die Casting and Its Microstructure Evaluation
p.377

Effect of Be Addition on the Precipitation Behaviors and Mechanical Properties in Al-Cu-Li-Mg-Zr-(Ag) Alloys
p.381

Electrochemical Etching of Aluminum Foil for Electrolytic Capacitors
p.385

HomeMaterials Science ForumMaterials Science Forum Vols. 475-479Dilute Alloy Designs of 7xxx Aluminum Alloys for...

Dilute Alloy Designs of 7xxx Aluminum Alloys for Thick Forging Applications

Abstract:

An effort has been made to present optimum alloy designs of commercial 7175 and 7050 type alloys to be used in thick forgings with proper microstructures and properties. The effects of changing alloy constitutions, primarily [Zn+Mg+Cu] and Zn:Mg ratio, on the evolutions of the coarse equilibrium phases and age hardening response are investigated. As a result, equilibrium phases (M,T,S) are evolved depending on alloy constitutions and cooling rate following solutionizing. The formation of the T- and S-phases is effectively controlled in the novel alloys (dilute and with high Zn:Mg ratio). In the slow quench, the redesign promotes homogeneous precipitation of η-phases, leading to higher mechanical properties than conventional alloys. The novel alloys provide microstructural homogeneity and extended heating range, ensuring 7xxx thick forging applications.