Author
Masoud Emamy
Bio: Masoud Emamy is an academic researcher from University of Tehran. The author has contributed to research in topics: Microstructure & Ultimate tensile strength. The author has an hindex of 25, co-authored 114 publications receiving 1487 citations.
Papers
More filters
TL;DR: In this paper, the behavior of extruded Mg-Gd-Al-Zn magnesium alloys at elevated temperatures was studied to elucidate the effect of intermetallic compounds on thermal stability, grain coarsening mode, and grain growth kinetics.
Abstract: The behavior of extruded Mg–Gd–Al–Zn magnesium alloys at elevated temperatures was studied to elucidate the effect of intermetallic compounds on thermal stability, grain coarsening mode, and grain growth kinetics. The presence of the fine and widely distributed intermetallic (Mg,Al)3Gd phase in the extruded microstructure of the Mg–4.8Gd–1.2Al–1Zn alloy was found to be quite effective in inhibiting grain growth. This was not the case for the Mg–3Gd–3Al–1Zn alloy, where the extruded microstructure showed that the grain boundaries are not effectively pinned by the main Al2Gd intermetallic phase. The grain coarsening situation was found to be more severe for the Mg–6Al–1Zn alloy because no second phases were present to pin the grain boundaries at elevated temperatures. The simultaneous presence of Al and Gd was found to be helpful in increasing the solidus temperature, and in this way, it further contributes to increasing thermal stability of the magnesium alloys. The abnormal grain growth occurred by penetrating into grain boundaries of smaller grains and by the formation of discrete islands inside large abnormal grains, which provided evidence for the occurrence of the solid-state wetting mechanism in this magnesium alloy.
59 citations
TL;DR: In this article, the effect of Gd/Al ratio on the properties of as-cast Mg-Gd-Al-Zn alloys was investigated by changing the chemical composition from that of AZ61 to GZ61.
58 citations
TL;DR: In this article, the effect of different amounts of Zr on the microstructure and tensile properties of homogenized and hot extruded Al-15% Mg 2 Si composite using optical microscopy and scanning electron microscopy (SEM).
57 citations
TL;DR: In this paper, the addition of zirconium to a super high strength Al-12.24Zn-3.25Mg-2.46Cu alloy has been shown to decrease average grain size, form rosette-like microstructure and introduce proper distribution of second phases.
52 citations
TL;DR: In this article, the dispersion stability of alumina colloidal particles stabilized by polymeric (non-ionic) surfactants in an electroless bath was investigated and the surface morphology and the relevant structure were evaluated by scanning electron microscopy and X-ray diffraction.
51 citations
Cited by
More filters
TL;DR: In 2018 and 2019, significant progress has been achieved in high-performance cast and wrought magnesium and magnesium alloys, such as Mg ion batteries, hydrogen storage Mg materials, bio-magnesium alloys and functional magnesium materials as discussed by the authors.
744 citations
TL;DR: In this paper, the authors focus on the following topics: (1) materials requirements in design of aircraft structures and engines, (2) recent advances in the development of aerospace materials, (3) challenges faced by recent aerospace materials and (4) future trends in aerospace materials.
477 citations
TL;DR: A critical review on the processing and application of rice husks (RHs) for the production of various silicon-based materials and of active carbon is presented in this paper, which addresses the different processing methods, the effects of various process parameters on the pyrolysis stage, the influence of physical, chemical and thermal treatments, activating conditions and activated carbon consolidation mechanisms.
433 citations
[...]
TL;DR: In this article, the authors presented a theory of liquid alloys and assembled all the necessary tools for the ab initio construction of an alloy phase diagram, which they used to construct a phase diagram.
Abstract: With the presentation of a theory of liquid alloys, we have now assembled all the necessary tools for the ab initio construction of an alloy phase diagram.
417 citations