Serration and Reversion Treatment in Al-Zn Alloys

Teruto Kanadani; Norihito Nagata; Keiyu Nakagawa; Makoto Hino; Koji Murakami

doi:10.4028/www.scientific.net/MSF.794-796.1175

Paper Titles

Effects of Cu or Li Addition and Multi-Step Aging Conditions on the Bake-Hardenability of an Al-Mg-Si Alloy
p.1152

Experimental and Numerical Investigations of the Plastic Deformation during Multi-Pass Asymmetric and Symmetric Rolling of High-Strength Aluminum Alloys
p.1157

Microstructural Evolution during Isothermal Annealing of a Cold-Rolled Al-Mn-Fe-Si Alloy with Different Microchemistry States
p.1163

Effect of Zr Addition on Recrystallization Behavior of Extruded Al-Mg-Si Alloys Containing Mn
p.1169

Serration and Reversion Treatment in Al-Zn Alloys
p.1175

Characterisation of Al-Cu and Al-Mg-Si Free-Cutting Alloys
p.1181

Effect of Extensive Isothermal Rolling on Microstructure and Mechanical Properties of an Al-Mg-Sc Alloy
p.1187

Effects of Thermo-Mechanical Treatment on the Microstructure of AA7085 Aluminum Alloy
p.1193

The Effect of Mn on Microstructure Evolution during Homogenization of Al-Mg-Si-Mn Alloys
p.1199

HomeMaterials Science ForumMaterials Science Forum Vols. 794-796Serration and Reversion Treatment in Al-Zn Alloys

Serration and Reversion Treatment in Al-Zn Alloys

Abstract:

Aging phenomena of Al-Zn alloys have been much investigated and many studies have been made on the change of mechanical properties on aging. Appearance of saw-tooth yielding (serration) in the stress-strain curve of tensile deformation has been reported in several reports. In this study, the relationship between occurrence of serration and reversion heat treatment was studied by tensile test on Al-Zn alloys. Serration was observed for the furnace cooled specimen, but not for the as-quenched one and the shortly aged one, which result is difficult to be interpreted by the Cottrell theory. The stress amplitude in the serration increased with increasing the time of annealing for reversion and then stayed at a constant value which might be interpreted by the Cottrell theory. The stress amplitude in the serration decreased with increasing the annealing temperature, which is contrary to the prediction by the Cottrell theory. The specimen directly annealed without aging and the one annealed after aging agreed well with each other in the tensile strength and the stress amplitude in the serration, which suggests solute clusters as the cause of serration.