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

Authors: Machado, D.C., Alves Flausino, P.C., Huang, Y., Cetlin, P.R., Langdon, T.G. and Pereira, P.H.R.

Journal: Journal of Materials Research and Technology

Volume: 24

Pages: 2850-2867

ISSN: 2238-7854

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 10−2s−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.

https://eprints.bournemouth.ac.uk/38385/

Source: Scopus

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

Authors: Machado, D.C., Flausino, P.C.A., Huang, Y., Cetlin, P.R., Langdon, T.G. and Pereira, P.H.R.

Journal: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

Volume: 24

Pages: 2850-2867

eISSN: 2214-0697

ISSN: 2238-7854

DOI: 10.1016/j.jmrt.2023.03.167

https://eprints.bournemouth.ac.uk/38385/

Source: Web of Science (Lite)

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

Authors: Machado, D.C., Flausino, P.C.A., Huang, Y., Cetlin, P.R., Langdon, T.G. and Pereira, P.H.R.

Journal: Journal of Materials Research and Technology

Volume: 24

Pages: 2850-2867

Publisher: Elsevier

ISSN: 2238-7854

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.

https://eprints.bournemouth.ac.uk/38385/

Source: Manual

Preferred by: Yi Huang

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

Authors: Machado, D.C., Flausino, P.C.A., Huang, Y., Cetlin, P.R., Langdon, T.G. and Pereira, P.H.R.

Journal: Journal of Materials Research and Technology

Publisher: Elsevier

ISSN: 2238-7854

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.

https://eprints.bournemouth.ac.uk/38385/

Source: BURO EPrints