On the Influence of Temperature and Number of Passes on the Mechanical Properties of an Al–Mg Alloy Processed by Cyclic Expansion Extrusion

• Published in: Metals and materials international Vol. 27; no. 8; pp. 2919 - 2932
• Main Authors: Babu, V., Shanmugavel, Balasivanandha Prabu, Padmanabhan, K. A.
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.08.2021; Springer Nature B.V; 대한금속·재료학회
• Subjects: Aluminum base alloys; Characterization and Evaluation of Materials; Chemistry and Materials Science; Dislocation density; Engineering Thermodynamics; Extrusion; Grain boundaries; Grain size; Hardness; Heat and Mass Transfer; Machines; Magnesium; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Mechanical properties; Metallic Materials; Processes; Solid Mechanics; Ultimate tensile strength; 재료공학; Microstructure; Cyclic expansion extrusion; Grain refinement; Al–Mg alloy
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-020-00781-y

The influence of working temperature and number of passes on the mechanical properties of aluminium alloy, AA 5083, processed by cyclic expansion and extrusion (CEE) is discussed. The specimens were processed up-to 10 CEE passes at 200 °C, 300 °C and 400 °C. The average grain size of the starting annealed material was 84.5 ± 6.8 μm, with 39.4% being of the high-angle grain boundaries (HAGBs) type. After 8 CEE passes at 200 °C the material had an average grain size of 3.3 ± 0.6 μm and 41.3% of the grain boundaries were of the high-angle type (HAGBs). The combined effect of an increase in dislocation density and reduction in grain size as a result of CEE processing contributed to an increase in hardness and strength of the alloy. At 200 °C, the specimen exhibited uniform hardness values with a maximum improvement of 104% after 8 passes and the ultimate tensile strength had also increased by 64% compared with the unprocessed condition. However, the mechanical properties decreased in the specimens that were processed at the higher temperatures of 300 °C and 400 °C. Graphic abstract