Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2017;6:348-54 DOI: 10.1016/j.jmrt.2017.05.008
Original Article
Examining the microhardness evolution and thermal stability of an Al–Mg–Sc alloy processed by high-pressure torsion at a high temperature
Pedro Henrique R. Pereiraa,b,, , Yi Huanga, Terence G. Langdona
a Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, United Kingdom
b CAPES Foundation, Ministry of Education of Brazil, Brasília, DF, Brazil
Received 10 April 2017, Accepted 23 May 2017
Abstract

An Al–3% Mg–0.2% Sc alloy was solution treated and processed through 10 turns of high-pressure torsion (HPT) at 450K. Afterwards, the HPT-processed alloy was annealed for 1h at temperatures ranging from 423 to 773K and its mechanical properties and microstructural evolution were examined using microhardness measurements and electron backscattered diffraction (EBSD) analysis. The results demonstrate that HPT processing at an elevated temperature leads to a more uniform microhardness distribution and to an early saturation in the hardness values in the Al alloy compared with high-pressure torsion at room temperature. In addition, detailed EBSD analysis conducted on the HPT-processed samples immediately after annealing revealed that the Al–Mg–Sc alloy subjected to HPT processing at 450K exhibits superior thermal stability by comparison with the same material subjected to HPT at 300K.

Keywords
Aluminium alloys, Hall–Petch relationship, Hardness, High-pressure torsion, Severe plastic deformation, Thermal stability
J Mater Res Technol 2017;6:348-54 DOI: 10.1016/j.jmrt.2017.05.008