Yazar "Khalifa, S.S.M." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    The Experimental Investigation of Punching of the AM60 and AZ61 Magnesium Alloy Sheets by Using Varied Punch Shapes
    (University of Kuwait, 2023) Cug, H.; Khalifa, S.S.M.; Gürün, H.
    The using of magnesium alloys for industrial sheet metal part production has become increasingly common in recent years. This research aims to characterize the effects of the cutting-edge shapes of the punches on the blanking forces and the sheared edge qualities in the blanking/piercing operations of magnesium alloy sheets. Magnesium sheets (AM60 and AZ61) were produced by casting and rolling processes. AM60 and AZ61 Mg alloys produced by casting were rolled by using two different speeds, 2.5 m/min and 7.5 m/min. Material thickness was adjusted to three mm in the rolling process. Blanking tests were carried out on a die-set and hydraulic press by varying shaped punches. In the experimental studies, flat-ended, concave shaped, and 16° angled punches were used. A loadcell was fixed to the experimental setup to determine the blanking forces. The results showed that the AM60 alloy was more resistant to shearing than the AZ61. The lowest blanking force was obtained by use of the 16° angled punch. It was determined that the using of flat-ended punches for blanking operations was more convenient according to the usage purpose of the parts while all three punches can be used for piercing operations. © 2023 University of Kuwait. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Influence of Thermomechanical Treatment on the Properties of Alloys of the Mg–Al–Zn–Mn System
    (Springer, 2020) Kug, K.; Khalifa, S.S.M.
    Magnesium alloys are subjected, after low-pressure casting, to hot-rolling and extrusion. It is shown that their structural states, for different rates of these processes, are determined by the joint development of dynamic recrystallization, formation of twins, and changes in the phase composition. It is demonstrated that the dissolution of metastable phase components and the corresponding decrease in the resistance of particles of the second phase to the displacements of grain boundaries with large disorientation angles in the process of recrystallization represent one of the causes of increase in the sizes of grains in the matrices of alloys. The mechanical properties of alloys are determined not only by the grain sizes and phase composition but also by the structural anisotropy formed as a result of thermomechanical treatment. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.