Figueiredo, Roberto B. and Langdon, Terence G. (2020) Using high-pressure torsion to achieve superplasticity in an AZ91 magnesium alloy. Metals, 10 (5), 1-10, [681]. (doi:10.3390/met10050681).
Abstract
An AZ91 magnesium alloy (Mg-9% Al-1% Zn) was processed by high-pressure torsion (HPT) after a solution heat treatment. Tensile tests were carried out at 423, 523 and 623 K in the strain rate range of 10-5 – 10-1 s-1 to evaluate the occurrence of superplasticity. The results show that HPT processing refines the grain structure in this alloy and grain sizes smaller than 10 µm are retained up to 623 K. Superplastic elongations were observed at low strain rates at 423 K and at all strain rates at 523 K. An examination of the experimental data shows good agreement with the theoretical prediction for grain boundary sliding which is the rate-controlling mechanism for superplasticity. Elongations in the range of 300% - 400% were observed at 623 K and this is attributed to a combination of grain boundary sliding and dislocation climb mechanisms. Keywords: creep; high-pressure torsion; magnesium; superplasticity
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- Current Faculties > Faculty of Engineering and Physical Sciences > School of Engineering > Mechanical Engineering > Engineering Materials and Surface Engineering Group
Mechanical Engineering > Engineering Materials and Surface Engineering Group - Faculties (pre 2018 reorg) > Faculty of Engineering and the Environment (pre 2018 reorg) > Mechanical Engineering (pre 2018 reorg) > Bioengineering Group (pre 2018 reorg)
Current Faculties > Faculty of Engineering and Physical Sciences > School of Engineering > Mechanical Engineering > Mechanical Engineering (pre 2018 reorg) > Bioengineering Group (pre 2018 reorg)
Mechanical Engineering > Mechanical Engineering (pre 2018 reorg) > Bioengineering Group (pre 2018 reorg)
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