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

Vladislav Kulitskiy; Sergey Malopheyev; Rustam Kaibyshev

doi:10.4028/www.scientific.net/MSF.794-796.1187

Paper Titles

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

The Effect of Elastic Straining on a 6060 Aluminium Alloy during Natural or Artificial Ageing
p.1205

Effect of Surface and Grain Boundary on the Reversion of Al-Zn Alloys
p.1211

HomeMaterials Science ForumMaterials Science Forum Vols. 794-796Effect of Extensive Isothermal Rolling on...

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

Abstract:

The evolution of microstructure and mechanical properties of an Al-5.4Mg-0.4Mn-0.2Sc-0.09Zr alloy subjected to rolling at 300^oC was studied. It was shown that the rolling of the alloy leads to strong anisotropy in mechanical properties. The formation of the lamellar structure occurs at a total reduction of 60% due to alignment of initial boundaries along rolling direction (RD), and appearance of geometrically necessary boundaries (GNB) aligned with {111} planes. This process is accompanied by a strong increase in the lattice dislocation density by a factor of 50. Further rolling induces the formation of subgrains within lamellar structure that diminishes the anisotropy. The GNBs have low-angle misorientations, initially. After a reduction of 80%, minor part of GNBs acquires high-angle misorientation. The formation of well-defined subgrains within lamellas leads to a decrease in the lattice dislocation density by a factor of about 10; the yield stress (YS) decrease is -25% along the RD. At the same time the YS in the transverse direction tends to increase with increasing reduction from 60 to 80%. The effect of the deformation structure on the mechanical properties and their anisotropy is discussed.