TY - GEN
T1 - Superplasticity of ultra-fine grained 7075 alloy processed by high-pressure torsion
AU - Lee, Seungwon
AU - Horita, Zen Ji
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2014
Y1 - 2014
N2 - An Al 7075 alloy (5.63mass%Zn-2.56mass%Mg-1.68mass%Cu-0.21mass%Fe- 0.19mass%Cr-0.14mass%Si-0.02mass%Ti with balance of Al) was processed by high-pressure torsion (HPT) under an applied pressure of 6 GPa for 1, 3 and 5 revolutions with a rotation speed of 1 rpm at room temperature. Vickers microhardness saturated to a level of 220 Hv after the HPT processing and the grain size was refined to 120 nm at the state of the hardness saturation. Tensile tests were conducted with initial strain rates from 2.0 × 10-4 to 2.0 × 10-2 s-1 at temperatures as 200 °C and 250 °C (equivalent to 0.52Tm and 0.57Tm, respectively, where Tm is the melting point of the alloy). The HPT-processed samples for 3 revolutions exhibited superplastic elongations of 640% and 510% at 250 °C with initial strain rates of 2.0 × 10-3 s-1 and 2.0 × 10-2 s-1, respectively.
AB - An Al 7075 alloy (5.63mass%Zn-2.56mass%Mg-1.68mass%Cu-0.21mass%Fe- 0.19mass%Cr-0.14mass%Si-0.02mass%Ti with balance of Al) was processed by high-pressure torsion (HPT) under an applied pressure of 6 GPa for 1, 3 and 5 revolutions with a rotation speed of 1 rpm at room temperature. Vickers microhardness saturated to a level of 220 Hv after the HPT processing and the grain size was refined to 120 nm at the state of the hardness saturation. Tensile tests were conducted with initial strain rates from 2.0 × 10-4 to 2.0 × 10-2 s-1 at temperatures as 200 °C and 250 °C (equivalent to 0.52Tm and 0.57Tm, respectively, where Tm is the melting point of the alloy). The HPT-processed samples for 3 revolutions exhibited superplastic elongations of 640% and 510% at 250 °C with initial strain rates of 2.0 × 10-3 s-1 and 2.0 × 10-2 s-1, respectively.
UR - http://www.scopus.com/inward/record.url?scp=84904394875&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84904394875&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.794-796.807
DO - 10.4028/www.scientific.net/MSF.794-796.807
M3 - Conference contribution
AN - SCOPUS:84904394875
SN - 9783038351207
T3 - Materials Science Forum
SP - 807
EP - 810
BT - Aluminium Alloys, ICAA 2014
A2 - Marthinsen, Knut
A2 - Holmedal, Bjørn
A2 - Li, Yanjun
PB - Trans Tech Publications Ltd
T2 - 14th International Conference on Aluminium Alloys, ICAA 2014
Y2 - 15 June 2014 through 19 June 2014
ER -