A magnesium-aluminium composite produced by high-pressure torsion

• Published in: Journal of alloys and compounds Vol. 804; pp. 421 - 426
• Main Authors: Castro, Moara M., Sabbaghianrad, Shima, Pereira, Pedro Henrique R., Mazzer, Eric M., Isaac, Augusta, Langdon, Terence G., Figueiredo, Roberto B.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 05-10-2019; Elsevier BV
• Subjects: Aluminium composite; Aluminum; Hardness; Heat treatment; High-pressure torsion; Intermetallic compounds; Intermetallics; Magnesium; Phases; Thermal treatment; Torsion; Intermetallics; Magnesium; Aluminium composite; High-pressure torsion; Thermal treatment
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.07.007

A magnesium/aluminium composite was produced by room temperature consolidation through high-pressure torsion (HPT) processing. Half-discs of the pure metals were placed side-by-side and subjected to different numbers of turns. The initially reduced interface between the phases gradually increased with increasing rotation. The composite displayed a significant ductility even after 10 turns. The distribution of hardness in the HPT-processed discs was bi-modal in the early stages of processing. As the number of turns increased and the thickness of the phases decreased there was a noticeable increase in hardness. The hardness values of the composite further increased after thermal treatment due to the formation of intermetallics within the interface between the magnesium and aluminium-rich phases.
•High pressure torsion of adjacent half disks leads to a gradual mixing of phases in a helical pattern.•Intermetallics formation is prevented during room temperature consolidation of pure magnesium with pure aluminium composite.•Elongation in tension over 15% is achieved in the processed composite.•Thermal treatment triggers the formation of intermetallics in the interfaces between magnesium and aluminium.