Study of Deformation and Fracture of Submicrocrystalline Aluminum Alloys by Acoustic Emission Method

Abstract

The deformation and fracture of submicrocrystalline aluminum Al-6%Mg and Al- 6.1%Mg-0.3%Sc-0.1%Zr alloys after severe plastic deformation (SPD) by equal channel angular pressing (ECAP) as well as the same convenient alloys were investigated by acoustic emission (AE) method. ECAP resulted in predominantly submicrocrystalline structure with high angle grain boundaries and grain sizes ~ 100-400 nm in Al-6.1%Mg-0.3%Sc-0.1%Zr alloy and ~ 300-700 nm in Al-6%Mg alloy. The AE measurements carried out during material tension tests give new information regarding the processes deformation and fracture in materials and, together with the methods of microstructure, phase and fractography analysis.

Effect of torsion conditions under high pressure on the structure and strengthening of the Zr–1% Nb alloy

“…Bulk ultrafine grained (nanostructured and submi crocrystalline) materials, which are produced by severe plastic deformation, in particular by torsion under high pressure, exhibit unique physicochemical and mechanical properties that differ from those of materials with traditional grain sizes [1][2][3][4][5][6][7][8][9].…”