Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-255-C7-261
High temperature mechanical properties of AlMgZn alloys with copper and zirconium additionsN.Q. CHINH1, A. JUHÁSZ1, P. TASNÁDI1, J. LENDVAI1 and I. KOVÁCS2
1 Institute for General Physics, Loránd Eötvös University, 1088 Budapest, Múzeum krt 6-8, Hungary
2 Institute for General Physics, Loránd Eötvös University, 1088 Budapest, Múzeum krt 6-8, Hungary
High temperature mechanical properties of AlMgZn alloys grain refined by zirconium were investigated by impression creep and tensile tests. The strain rate sensitivities and activation energies obtained are presented. It has been found that the steady-state impression creep rate is strongly influenced by Cu and Zr addition. The simultaneous addition of Cu and Zr resulted in fine-grained microstructure due to which the material exhibited superplastic properties at high temperatures. Together with the superplastic behaviour the occurrence of a threshold stress has also been observed.
© EDP Sciences 1993