Cavitation During Creep Deformation in AA7075-T76: Cellular Automata Simulation and Experiments

, Article Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science ; Volume 52, Issue 9 , 2021 , Pages 4146-4160 ; 10735623 (ISSN) Safarloo, S ; Serajzadeh, S ; Sharif University of Technology

Springer 2021

Abstract

In this work, cavitation during creep in AA7075-T76 was simulated employing a probabilistic cellular automata scheme. Two-dimensional cellular automata coupled with the governing equations for cavity growth were utilized to define the size and distribution of cavities during creep. Both diffusion and strain-controlled mechanisms were taken into account while the first and second neighboring cells were considered for determination of the cavity growth as well as to generate the initial microstructure. Moreover, uni-axial creep experiments on AA7075-T76 were carried out under different temperatures and applied stresses including 170 MPa at 150 °C and 150 MPa at 160 °C. The microstructural...

Deformation and creep characteristics of AA7075-T76 at elevated temperatures

, Article Journal of Materials Engineering and Performance ; Volume 31, Issue 9 , 2022 , Pages 7586-7595 ; 10599495 (ISSN) Safarloo, S ; Serajzadeh, S ; Sharif University of Technology

Springer 2022

Abstract

In this work, deformation behavior as well as creep and cavitation of AA7075-T76 were studied. The as-received plate was first stabilized utilizing solution treatment followed by two-stage artificial aging at 120 and 180 °C. Then, tensile tests were carried out on the aged-alloy in the temperature range between 120 and 250 °C under strain rates of 0.0005 and 0.005 s−1. Furthermore, stress-controlled creep tests were performed at temperatures varying between 120 and 210 °C at stresses ranging from 130 to 250 MPa. Microstructural evolution was then conducted to assess the microstructural changes and growth of cavities during creep employing optical metallography and scanning electron...

An Investigation into Creep Behavior and Cavitation in a 7000-Series Aluminum Alloy

, M.Sc. Thesis Sharif University of Technology Safarloo, Sama (Author) ; Serajzadeh, Siamak (Supervisor)

Abstract

In this study, creep behavior and cavitation as well as high temperature deformation of Al-Zn-Mg aluminum alloy were investigated by means of uni-axial creep and tensile tests. The as-received material i.e. AA7075 plate, was first stabilized utilizing over-aging heat treatment and then stress-controlled creep tests were performed in the temperatures ranging between 120℃ to 210℃ under the applied stresses varying 130MPa to 250MPa. Accordingly, the stress exponent and creep activation energy were determined as 5.7 and 149kJ/mol.K to 189kJ/mol.K, respectively. Considering these parameters, it was found that the governing creep mechanism, in the mentioned temperature range, would be dislocation...