"301832" . . "Schindler, Ivo" . . "0018-8069" . "Legerski, Miroslav" . . "62" . "4"^^ . "4"^^ . . . "Hadasik, Eugeniusz" . . "Hutnick\u00E9 listy" . "RIV/61989100:27360/09:00022050!RIV10-MSM-27360___" . "Activation energy of the aluminium alloy Mg-3Al-1Zn in hot forming" . "2"^^ . "[3F75C7971DFC]" . . "27360" . "Activation energy of the aluminium alloy Mg-3Al-1Zn in hot forming"@en . . . . . . "Compression tests of specimens from the aluminium alloy Mg-3Al-1Zn (AZ31) at temperature T = 250 to 450 \u00B0C and strain rate gama=0.01 to 10 s-1 were performed. From the peaks of the obtained stress-strain curves, the values of the activation energy Q and other material constants, usable for the description of the maximum stress and the kinetics of the dynamic recrystallization in dependence on the Zener-Hollomon parameter Z were expressed numerically. The deformation behaviour and especially the shape of the stress-strain curves differ significantly at the low and high values of the parameter Z. The boundary between these areas was determined mathematically as Z = 2.9E+13 s-1. While the specified activation energy Q was for these both areas nearly identical (157 or 155 kJ/mol, respectively), the mathematical description of the coordinates of the stress peak is markedly different. The changes in the deformation behaviour consist in a strong effect of twinning in the initial stages of forming in the case" . "RIV/61989100:27360/09:00022050" . "Activation energy of the aluminium alloy Mg-3Al-1Zn in hot forming" . . "4" . "Activation energy of the aluminium alloy Mg-3Al-1Zn in hot forming"@en . . "Activation energy; magnesium alloy; AZ31"@en . "Compression tests of specimens from the aluminium alloy Mg-3Al-1Zn (AZ31) at temperature T = 250 to 450 \u00B0C and strain rate gama=0.01 to 10 s-1 were performed. From the peaks of the obtained stress-strain curves, the values of the activation energy Q and other material constants, usable for the description of the maximum stress and the kinetics of the dynamic recrystallization in dependence on the Zener-Hollomon parameter Z were expressed numerically. The deformation behaviour and especially the shape of the stress-strain curves differ significantly at the low and high values of the parameter Z. The boundary between these areas was determined mathematically as Z = 2.9E+13 s-1. While the specified activation energy Q was for these both areas nearly identical (157 or 155 kJ/mol, respectively), the mathematical description of the coordinates of the stress peak is markedly different. The changes in the deformation behaviour consist in a strong effect of twinning in the initial stages of forming in the case"@en . "CZ - \u010Cesk\u00E1 republika" . . . "Kuc, Dariusz" . "Z(MSM6198910015)" .