Showing 4 results for Solid Solution
T. Mousavi, M. H. Abbasi, F. Karimzadeh, and M. H. Enayati,
Volume 26, Issue 2 (1-2008)
Abstract
A. Zare, M. Hadi, A. Ghasemi, H. Karimi , M. Sadeghi,
Volume 34, Issue 2 (7-2015)
Abstract
The aim of this investigation was to produce Ti47Al48Mn5 intermetallic compounds with different microstructures in order to study their oxidation behavior. The reason for selecting manganese as an alloying element was to enhance the toughness of the compound. Ti47Al48Mn5 alloys were obtained through mechanical alloying, cold pressing and heat treatment. XRD results showed that milling of the elemental powder mixture for 30 hours causes the formation of Al and Mn in Ti solid solution, while by increasing milling time up to 50 hours, amorphization of powder mixture occurs. To obtain duplex and fully lamellar microstructures, the mechanically alloyed powders were cold pressed and then heat treated at 1100 °C and 1400 °C in argon atmosphere for 50 hours, respectively. The results of the oxidation test at 1000 °C revealed that the different microstructures of Ti47Al48Mn5 alloy investigated in this study have little effect on the oxidation resistance, and similar oxidation mechanisms existed for the two microstructures.
S. Safi, Dr G. H. Akbari,
Volume 36, Issue 1 (6-2017)
Abstract
Strengthening of copper matrix by dispersion of metallic oxides particles as an efficient way to increase strength without losing thermal and electrical conductivities has been recognized for many years. Such a composite can withstand high temperatures and keep its properties. Such copper alloys have many applications especially in high temperature including resistance welding electrodes, electrical motors and switches. In the present work, at first, the Cu-1%Al solid solution was prepared by the mechanical alloying process via 48 hours of milling. Subsequently, 0.66 gr of copper oxide was added to Cu-1%Al solid solution and mechanically milled for different milling times of 0,16, 32, 48 hours. The milled powder mixtures were investigated by X-Ray Diffraction and scanning electron microscopy techniques. The lattice parameter of Cu increased at first, but then decreased at longer milling times. The internal strain increased and the average Cu crystal size decreased during milling process.The particle size decreased during the whole process. With increasing annealing temprature from 450°C to 750°C, the microhardness values of samples decreased at the beginning but then increased. From these results, it can be concluded that nanosize aluminaparticles are formed in the copper matrix.
Kh. Zamani, M. Tavoosi, A. Ghasemi ,
Volume 39, Issue 4 (2-2021)
Abstract
In this research, effect of B and Si addition on the structural and magnetic properties of AlCoCrMnNi high-entropy alloys was investigated. The structural and magnetic properties of AlCoCrMnNiX(X= B, Si) alloys were studied by X-ray diffractometer (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and vibrating sample magnetometer (VSM). First, the constituent components of the AlCoCrMnNiX (X=B, Si) alloys were mixed for 10 hours. XRD analysis revealed that the solid solution was not formed by mixing. The alloys were then annealed at 900 ˚C for 10 hours. XRD results revealed formation of a solid solution with BCC structure in AlCoCrMnNi and AlCoCrMnNiB alloys. For AlCoCrMnNiSi and AlCoCrMnNiSiB alloys, Ni2Si and Cr2Si3 intermetallics were formed in addition to the solid solution with BCC structure. VSM results suggested that while forming the solid solution for AlCoCrMnNi alloy, soft magnetic properties improved so that magnetic saturation and coercivity increased from 40.22 to 64.46 emu/g, and from 180.143 to 14.09 Oe, respectively.
