Study of hot deformation of an Al–Cu–Mg alloy using processing maps and microstructural characterization

Abstract

The forming behaviour of an Al-Cu-Mg alloy (Al 2024-T351) has been studied by processing maps and microstructural characterization. Torsion tests were conducted in the range 278 to 467 ºC, between 2.1 and 25.6 s-1. Stress-strain curves obtained from the experiment data were fitted using the Garofalo equation to obtain the constitutive parameters, obtaining a stress exponent of 6.1 and an activation energy of 180 kJ/mol. Electron backscatter diffraction (EBSD) was employed to characterize the microtexture and microstructure, before and after torsion testing, to evaluate the microstructural changes and instability phenomena. A peak ductility of the Al 2024 alloy was found at about 400 ºC at all strain rates considered. According to the processing maps and microstructure observation, the optimum hot deformation condition for the Al 2024 alloy is in the range 360-410 ºC and 2.1-4.5 s −1. Under these favourable conditions a uniform and fine grain size is obtained by extended dynamic recovery (DRV), which leads to the formation of subgrain boundaries that progressively transform at large strains into new high angle grain boundaries.

The hot deformation behavior and processing map of Ti–47.5Al–Cr–V alloy

“…Based on the dynamic material modeling(DMM), the processing maps have been widely used to examine the hot deformation behavior of different types of metals and A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 3 alloys [18][19][20][21][22][23][24] since it was developed by Y.V.R.K. Prasad et al in 1984 [25].…”

Hot tensile deformation behavior of twin roll casted 7075 aluminum alloy

“…9(d)). These whiskers were thought to form through viscous flow of a liquid-like grain boundary sliding (GBS) [29]. It should be noted that, clear grain boundaries were found under the condition of 450°C and 5×10 -3 s -1 , revealing typical ductile intergranular fracture mechanism.…”

The analysis of the hot deformation behaviour of the Ti–3Al–8V–6Cr–4Zr–4Mo alloy, using processing maps, a map of microstructure and of hardness

“…However, it is very important to determine the precise deformation conditions to control the microstructure and final properties. The solution to this problem could be processing maps (P-maps), developed on the basis of the theory of dynamic material modelling, DMM [2][3][4][5][6][7]. P-maps are prepared through the combination of a power dissipation efficiency map (g), illustrated by isoclines, with the parameter of flow instability (n).…”