In this study, the effect of Al alloy temper type on the microstructure and mechanical properties of Al 6061 (T6,O) and Mg AZ31 (O) were investigated. The interface of joints was investigated by optical microscope (OM) and Scanning Electron Microscope (SEM) equipped wit More
In this study, the effect of Al alloy temper type on the microstructure and mechanical properties of Al 6061 (T6,O) and Mg AZ31 (O) were investigated. The interface of joints was investigated by optical microscope (OM) and Scanning Electron Microscope (SEM) equipped with EDS and Linescane analysis. Mechanical properties of joints were measured by using a Vickers microhardness and shear strength tests. According to the results, in Al 6061-O/Mg AZ31 joint, less plastic deformation in the Mg alloy, further diffusion rate of Mg atoms in the Al alloy and the formation of diffusion region with the lowest amount of microhardness (140 HV) and the highest amount of shear strength (32 MPa) was occurred compared to Al 6061-T6/Mg AZ31 joint. Evaluation of fracture surfaces indicates the occurrence of the failure in brittle phase of Al3Mg2.
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in this study, magnetic powders Ba (Mg, Ti)xFe12-2xO19 and Ba (Zn, Cu)xFe12-2xO19 with x=0.5 using mechanical alloying process a high-energy mill was prepared. Continuing a sample of pure powder and two samples doped powder was produced.In order to evaluate the phase, m More
in this study, magnetic powders Ba (Mg, Ti)xFe12-2xO19 and Ba (Zn, Cu)xFe12-2xO19 with x=0.5 using mechanical alloying process a high-energy mill was prepared. Continuing a sample of pure powder and two samples doped powder was produced.In order to evaluate the phase, morphological and magnetic properties by X-ray diffraction analysis (XRD), field emission scanning electron microscope (FE-SEM) and vibrating sample magnetometer (VSM) was used. X-ray patterns in temperature 1000°C confirming the composition was almost single phase barium hexaferrite. SEM represents a hexagonal plate morphology due to preferential growth of particles in the ab crystallographic directions, respectively. Magnetic studies revealed the presence of diamagnetic ions of zinc and copper in the structure of barium hexaferrite more effective than paramagnetic cations magnesium and titanium saturation magnetization and the coercivity is reduced parameters. high saturation magnetization (53emu/g) of the sample produced composition and the lowest power BaMg0.5Ti0.5Fe11O19 coercivity (50Oe) of the samples were obtained by combining BaZn0.5Cu0.5Fe11O19
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In this research, barium hexaferrite samples with BaZn0.6Zr0.3X0.3Fe10.8O19 (X=Ti,Ce,Sn) composition were synthesized via mechanical activation method and were evaluated by X-ray diffraction (XRD), field emission electron microscopy (FE-SEM), vibrating sample magnetomet More
In this research, barium hexaferrite samples with BaZn0.6Zr0.3X0.3Fe10.8O19 (X=Ti,Ce,Sn) composition were synthesized via mechanical activation method and were evaluated by X-ray diffraction (XRD), field emission electron microscopy (FE-SEM), vibrating sample magnetometer (VSM) and Vector network analysis (VNA). X-ray diffraction results confirmed the present of barium hexaferrite as a dominant phase with small amount of hematite as a non-magnetic phase in the sample compound. Lattice parameters a and c was increased due to the difference between ionic radius of guest and host ions and the largest increases was related to the sample that containing cerium ion. The FE-SEM results confirmed the average particles size of about 450 nm and 250 nm for samples without and with dopant respectively. According to M-H curves the value of saturation magnetization (Ms) and coercive force (Hc) was reduced in all cases and significant changes were observed in magnetic properties of barium hexaferrite with the effect of substitution of Fe ions. According to the results maximum magnetic saturation (33.1 emu/g) and minimum coercivity force (8.14 Oe) were related to samples with composition of BaZn0.6Zr0.3Ti0.3Fe10.8O19 and BaZn0.6Zr0.3Sn0.3Fe10.8O19 respectively. According to the results of microwave absorption in the frequency range of 8-12.4 GHz the maximum absorption was related to the sample with the composition of BaZn0.6Zr0.3Sn0.3Fe10.8O19 at the frequency of 11.1 GHz was -16.3 dB.
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