Zohreh Sarvi - Academia.edu (original) (raw)

Zohreh Sarvi

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Papers by Zohreh Sarvi

Research paper thumbnail of Stoichiometry and Texture Evolution of Individual Layers during Accumulative Roll Bonding of Al-Mg Laminated Composites

Journal of Materials Engineering and Performance

Six cycles of ARB at three elevated temperatures (400, 450, and 500°C) were applied on Al/Mg lami... more Six cycles of ARB at three elevated temperatures (400, 450, and 500°C) were applied on Al/Mg laminated metallic composites. Samples were studied by microscopy, spectroscopy, and x-ray diffraction to investigate the effect of temperature on microstructures, second phases, and preferred crystallographic orientations. Stoichiometry analysis indicated the formation of non-equilibrium intermetallic phases at the Al/Mg interface. The thickness of the intermetallic layer increased in consecutive passes and by increasing process temperature. Annealing moved the composition toward predicted thermodynamically stable phases by absorbing Al and rejecting excess Mg. EDS examination showed the formation of Al 2 Mg and Al 30 Mg 23 phases in addition to the previously reported Al 12 Mg 17 and Al 3 Mg 2. XRD results indicated that the preferred crystallographic orientation of the Al layer deviates from the expected plain-strain rolling texture. At the same time, for the Mg layer, the hexagonal c-axis remained parallel to the applied rolling force direction. The most uniform crack-free structure has been formed at 450°C.

Research paper thumbnail of Effect of Accumulative Roll Bonding (ARB) strain path on microstructural evolution and crystallographic texture development in aluminium

Journal of Materials Research and Technology

Research paper thumbnail of A novel cohesive zone model to simulate ductile adhesives in automotive structure metallic joints

International Journal of Computational Physics Series, 2018

In recent years, increasing utilize of the adhesively bonded joints due to its prominent features... more In recent years, increasing utilize of the adhesively bonded joints due to its prominent features in distribution of the stress in bonded area and bonding dissimilar material has led to developing its computational aspects to provide more reliable response. In this regard, cohesive zone model (CZM) as an effective method to simulate bondline is introduced. The crucial aspect of this method is the determination of the relation between traction and separation in fracture process zone (FPZ). In fact, the traction-separation law (TSL) is a material model which must be properly obtained and applied to the adhesive bondline. According to the literature, mechanical response of the adhesive joints in most cases (especially in ductile and semi-brittle adhesives) is depended on the TSL curve shape. In this study, a novel CZM is developed to simulate double cantilever beam (DCB) adhesive joint. The main advantageous this new model is considering non-linear behavior of ductile adhesives in elas...

Research paper thumbnail of Stoichiometry and Texture Evolution of Individual Layers during Accumulative Roll Bonding of Al-Mg Laminated Composites

Journal of Materials Engineering and Performance

Six cycles of ARB at three elevated temperatures (400, 450, and 500°C) were applied on Al/Mg lami... more Six cycles of ARB at three elevated temperatures (400, 450, and 500°C) were applied on Al/Mg laminated metallic composites. Samples were studied by microscopy, spectroscopy, and x-ray diffraction to investigate the effect of temperature on microstructures, second phases, and preferred crystallographic orientations. Stoichiometry analysis indicated the formation of non-equilibrium intermetallic phases at the Al/Mg interface. The thickness of the intermetallic layer increased in consecutive passes and by increasing process temperature. Annealing moved the composition toward predicted thermodynamically stable phases by absorbing Al and rejecting excess Mg. EDS examination showed the formation of Al 2 Mg and Al 30 Mg 23 phases in addition to the previously reported Al 12 Mg 17 and Al 3 Mg 2. XRD results indicated that the preferred crystallographic orientation of the Al layer deviates from the expected plain-strain rolling texture. At the same time, for the Mg layer, the hexagonal c-axis remained parallel to the applied rolling force direction. The most uniform crack-free structure has been formed at 450°C.

Research paper thumbnail of Effect of Accumulative Roll Bonding (ARB) strain path on microstructural evolution and crystallographic texture development in aluminium

Journal of Materials Research and Technology

Research paper thumbnail of A novel cohesive zone model to simulate ductile adhesives in automotive structure metallic joints

International Journal of Computational Physics Series, 2018

In recent years, increasing utilize of the adhesively bonded joints due to its prominent features... more In recent years, increasing utilize of the adhesively bonded joints due to its prominent features in distribution of the stress in bonded area and bonding dissimilar material has led to developing its computational aspects to provide more reliable response. In this regard, cohesive zone model (CZM) as an effective method to simulate bondline is introduced. The crucial aspect of this method is the determination of the relation between traction and separation in fracture process zone (FPZ). In fact, the traction-separation law (TSL) is a material model which must be properly obtained and applied to the adhesive bondline. According to the literature, mechanical response of the adhesive joints in most cases (especially in ductile and semi-brittle adhesives) is depended on the TSL curve shape. In this study, a novel CZM is developed to simulate double cantilever beam (DCB) adhesive joint. The main advantageous this new model is considering non-linear behavior of ductile adhesives in elas...

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