Skip to main content

Influence of processing temperature on microhardness evolution, microstructure and superplastic behaviour in an Al-Mg alloy processed by high-pressure torsion.

Machado, D. C., Flausino, P. C. A., Huang, Y., Cetlin, P. R., Langdon, T. G. and Pereira, P. H. R., 2023. Influence of processing temperature on microhardness evolution, microstructure and superplastic behaviour in an Al-Mg alloy processed by high-pressure torsion. Journal of Materials Research and Technology, 24, 2850-2867.

Full text available as:

[img]
Preview
PDF (OPEN ACCESS ARTICLE)
1-s2.0-S2238785423006300-main (1).pdf - Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

4MB
[img] PDF (OPEN ACCESS ARTICLE)
1-s2.0-S2238785423006300-main.pdf - Accepted Version
Restricted to Repository staff only
Available under License Creative Commons Attribution Non-commercial No Derivatives.

2MB

DOI: 10.1016/j.jmrt.2023.03.167

Abstract

Experiments were conducted to assess the effect of processing temperature on the hardness evolution, microstructure and the flow properties of an annealed Al-3Mg alloy processed by high-pressure torsion (HPT) at either 300 or 450 K. The results demonstrate that HPT processing at room temperature (RT) leads to higher microhardness values with a more uniform hardness distribution in the Al alloy compared with processing at 450 K. After 10 HPT turns at RT, the microstructure displayed a more intense grain refinement, a higher dislocation density and smaller Al3Mg2 precipitates than after HPT at 450 K. Accordingly, the metal processed at RT showed enhanced strength at RT and consistently exhibited superplastic flow during deformation at 523 K, with tensile elongations of ~530-650 % for strain rates from 〖"10" 〗^"-3" to 〖"10" 〗^"-2" "s" ^"-1" . Conversely, a maximum elongation of ~110 % was recorded at 523 K in the alloy processed by HPT at 450 K. This behaviour is attributed to an enhanced thermal stability in the metal processed at RT compared with HPT at 450 K where deformation at 523 K led to the onset of abnormal grain coarsening due to a more disperse distribution of grain sizes and the partial dissolution and coalescence of Al3Mg2 precipitates after HPT processing.

Item Type:Article
ISSN:2238-7854
Uncontrolled Keywords:Aluminium alloys; Hardness; High-pressure torsion; Superplasticity; Thermal stability
Group:Faculty of Science & Technology
ID Code:38385
Deposited By: Symplectic RT2
Deposited On:05 Apr 2023 13:50
Last Modified:23 May 2024 11:14

Downloads

Downloads per month over past year

More statistics for this item...
Repository Staff Only -