Thermal stability and superplastic behaviour of an Al-Mg-Sc alloy processed by ECAP and HPT at different temperatures
Authors: Pereira, P.H.R., Huang, Y. and Langdon, T.G.
Journal: IOP Conference Series: Materials Science and Engineering
Volume: 194
Issue: 1
eISSN: 1757-899X
ISSN: 1757-8981
DOI: 10.1088/1757-899X/194/1/012013
Abstract:An Al-3%Mg-0.2%Sc alloy was processed by ECAP and HPT at different temperatures. Afterwards, samples subjected to 10 turns of HPT at 300 and 450 K, 8 passes of ECAP at 300 K and 10 passes of ECAP at 600 K were annealed for 1 hour at 523 K and their mechanical properties and microstructure were examined using microhardness measurements and EBSD analysis. In addition, tensile specimens with similar dimensions were machined from the HPT and ECAP-processed materials and further tensile tested at 523 K. The results demonstrate that the Al alloy processed by HPT at 450 K exhibits higher microhardness values (∼138 Hv) and a smaller average grain size (∼0.28 μm) after annealing at 523 K among all SPD processing conditions. Accordingly, the material subjected to HPT at an elevated temperature displays superior superplastic properties such that an elongation of ∼1020 % was attained after testing at 523 K at 1.0 × 10-3 s-1. Furthermore, detailed EBSD analysis revealed a significant fraction of low-angle grain boundaries (LAGBs > 33 %) in the ECAP-processed material after annealing which may be responsible for the inferior superplastic behaviour by comparison with the HPT-processed samples (LAGBs < 13 %) tested at 523 K.
Source: Scopus
Thermal stability and superplastic behaviour of an Al-Mg-Sc alloy processed by ECAP and HPT at different temperatures
Authors: Pereira, P.H.R., Huang, Y. and Langdon, T.G.
Journal: 7TH INTERNATIONAL CONFERENCE ON NANOMATERIALS BY SEVERE PLASTIC DEFORMATION
Volume: 194
ISSN: 1757-8981
DOI: 10.1088/1757-899X/194/1/012013
Source: Web of Science (Lite)
Thermal stability and superplastic behaviour of an Al-Mg-Sc alloy processed by ECAP and HPT at different temperatures
Authors: Pereira, P.H.R., Huang, Y. and Langdon, T.G.
Conference: NanoSPD7: The 7th International Conference on Nanomaterials by Severe Plastic Deformation
Dates: 2-7 July 2017
Journal: IOP Conference Series: Materials Science and Engineering
Volume: 194
Issue: 1
Pages: 012013(1)-012013(6)
eISSN: 1757-899X
ISSN: 1757-8981
DOI: 10.1088/1757-899X/194/1/012013
Abstract:© Published under licence by IOP Publishing Ltd. An Al-3%Mg-0.2%Sc alloy was processed by ECAP and HPT at different temperatures. Afterwards, samples subjected to 10 turns of HPT at 300 and 450 K, 8 passes of ECAP at 300 K and 10 passes of ECAP at 600 K were annealed for 1 hour at 523 K and their mechanical properties and microstructure were examined using microhardness measurements and EBSD analysis. In addition, tensile specimens with similar dimensions were machined from the HPT and ECAP-processed materials and further tensile tested at 523 K. The results demonstrate that the Al alloy processed by HPT at 450 K exhibits higher microhardness values (∼138 Hv) and a smaller average grain size (∼0.28 μm) after annealing at 523 K among all SPD processing conditions. Accordingly, the material subjected to HPT at an elevated temperature displays superior superplastic properties such that an elongation of ∼1020 % was attained after testing at 523 K at 1.0 × 10-3 s-1. Furthermore, detailed EBSD analysis revealed a significant fraction of low-angle grain boundaries (LAGBs > 33 %) in the ECAP-processed material after annealing which may be responsible for the inferior superplastic behaviour by comparison with the HPT-processed samples (LAGBs < 13 %) tested at 523 K.
Source: Manual
Preferred by: Yi Huang