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Eivani, A. R. (author), Vafaeenezhad, H. (author), Nikan, O. (author), Zhou, J. (author)
This research was aimed to assess the potential of a radial basis function (RBF) approximation method against the dislocation substructure-based constitutive model in predicting high-temperature deformation behavior of the AA7020 aluminum alloy. Hot compression tests were performed over a range of strain rate of 0.1–100 s<sup>−1</sup> and a...
journal article 2019
document
Najafi, S. (author), Eivani, A. R. (author), Samaee, M. (author), Jafarian, H. R. (author), Zhou, J. (author)
The effect of equal channel angular pressing (ECAP) on the microstructure and mechanical properties of AA6063 aluminum alloy was investigated. For this purpose, samples of AA6063 aluminum alloy were deformed up to 10 passes using ECAP and the evolution of microstructure, texture and dislocation density was investigated. It was found that the...
journal article 2018
document
Ashrafizadeh, S.M. (author), Eivani, A.R. (author), Jafarian, HR (author), Zhou, J. (author)
A two-stage solution treatment composed of an initial soaking at 420 °C for 10 min and the second soaking at 500 °C for 10 min was applied to cold-worked AA6063 aluminum alloy samples after equal channel angular pressing (ECAP) for two and four passes. The microstructures and mechanical properties of the samples were compared with those of...
journal article 2017
document
Eivani, A.R. (author), Zhou, J. (author)
In this research, hot compression test is used to simulate the metallurgical phenomena occurring in the peripheral part of AA7020 aluminum alloy extrudates during hot extrusion and leading to the formation of the peripheral coarse grain (PCG) structure. The temperature profiles at a tracking point in the peripheral part of extrudates are...
journal article 2017
document
Samaee, M. (author), Najafi, S. (author), Eivani, A. R. (author), Jafarian, H. R. (author), Zhou, J. (author)
In this research, grain refinement through severe plastic deformation (SPD) in combination with a thermal treatment to create a fine initial grain structure with a high degree of supersaturation was taken as a viable approach to achieving simultaneous increases in the hardness, strength and ductility of the aluminum alloy AA6063 during...
journal article 2016
document
Eivani, A.R. (author), Valipour, S. (author), Ahmed, H. (author), Zhou, J. (author), Duszczyk, J. (author)
In this article, a new relationship for the calculation of the Zener drag pressure is described in which the effect of the size distribution of nanoscale dispersed particles is taken into account, in addition to particle radius and volume fraction, which have been incorporated in the existing relationships. Microstructural observations indicated...
journal article 2010
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Eivani, A.R. (author), Ahmed, H. (author), Zhou, J. (author), Duszczyk, J. (author)
This research concerns the effect of homogenization treatment on the electrical resistivity of AA7020 aluminum alloy variants with different Zr and Cr contents. Small changes in the Zr and Cr contents of the as-cast alloy increase the electrical resistivity significantly. After employing various homogenization treatments, the electrical...
journal article 2009
document
Eivani, A.R. (author), Ahmed, H. (author), Zhou, J. (author), Duszczyk, J. (author)
The presence of large constitutive particles formed during solidification decreases the strength and hot workability of aluminum alloys especially when they are located in the grain boundary (GB) regions. Therefore, the evolution of these phases is a major issue in the homogenization process of these alloys. There is a lack of information on the...
journal article 2009
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