The Experts below are selected from a list of 36393 Experts worldwide ranked by ideXlab platform

Fuquan Zhao - One of the best experts on this subject based on the ideXlab platform.

  • fabrication of b4c particulate reinforced magnesium matrix composite by powder metallurgy
    Journal of Alloys and Compounds, 2005
    Co-Authors: Q Jiang, Huiyuan Wang, B X, Y Wang, Fuquan Zhao
    Abstract:

    Abstract Magnesium metal matrix composites (MMCs) reinforced with various fractions of 10, 15 and 20 vol.% B 4 C particulates fabricated by powder metallurgy (P/M) technique were investigated. Microstructure Characterization of the composites revealed necklace distribution of B 4 C particulates in the matrix material and the presence of minimal micro-porosity. The X-ray diffraction (XRD) showed the formation of MgO and MgB 2 in B 4 C/Mg composites. Moreover, the results revealed that the hardness and wear resistance of the composites were higher than those of as-cast Mg ingot and increased with increasing amount of B 4 C particulates from 10 to 20 vol.%.

S K Pradhan - One of the best experts on this subject based on the ideXlab platform.

  • Microstructure Characterization and cation distribution of nanocrystalline magnesium ferrite prepared by ball milling
    Materials Chemistry and Physics, 2005
    Co-Authors: S Bid, S K Pradhan, Milen Gateshki, Valeri Petkov
    Abstract:

    Abstract Nanocrystalline magnesium ferrite is synthesized by high-energy ball milling. The formation of nanocrystalline ferrite phase is observed after 3 h of milling and its content increases with milling time. The structural and microstructural evolution of the nanophase have been studied by X-ray powder diffraction and the Rietveld method. After 3 h of milling, ferrite phase (mixed spinel) nucleates from the starting α-Fe2O3–MgO solid solution. After 5 h of milling, a second ferrite phase (inverse spinel) with a larger lattice parameter emerges and its content grows in parallel with that of the mixed spinel matrix. After 11 h of milling, only a very small amount (∼3 wt.%) of the starting α-Fe2O3 remains unused. With increasing milling time the type of the cationic distribution over the tetrahedral and octahedral sites in the lattice of the nanocrystalline material changes from a mixed to inverse type. Microstructure Characterization by HRTEM corroborates the findings of X-ray analysis.

  • Microstructure Characterization and phase transformation kinetics of ball milled prepared nanocrystalline zn2tio4 by rietveld method
    Materials Chemistry and Physics, 2003
    Co-Authors: S K Manik, P Bose, S K Pradhan
    Abstract:

    Abstract Both the normal and inverse Zn2TiO4 spinel phases have been synthesized by ball milling the mixture of ZnO and anatase TiO2 (2:1 mol%) in a high-energy planetary ball mill. Microstructure Characterization of unmilled and ball-milled materials has been made by employing the Rietveld’s powder structure refinement methodology using X-ray powder diffraction data. Phase transformation kinetics of ball-milled composites has been studied in terms of relative abundance of phases at different milling duration. Particle size and r.m.s. lattice strain values of ZnO, and spinel phases are found to be anisotropic and that of anatase, rutile and srilankite polymorphic TiO2 phases are isotropic in nature. It seems that the normal Zn2TiO4 has been formed from the ZnO–anatase TiO2 solid solution and its inverse counterpart from ZnO–srilankite TiO2 solid solution. A high degree of anisotropy in r.m.s. lattice strain along the dense (0 0 2) plane of hexagonal ZnO lattice suggests that the Zn atoms on this lattice plane is preferably substituted by the Ti atoms.

Q Jiang - One of the best experts on this subject based on the ideXlab platform.

  • fabrication of b4c particulate reinforced magnesium matrix composite by powder metallurgy
    Journal of Alloys and Compounds, 2005
    Co-Authors: Q Jiang, Huiyuan Wang, B X, Y Wang, Fuquan Zhao
    Abstract:

    Abstract Magnesium metal matrix composites (MMCs) reinforced with various fractions of 10, 15 and 20 vol.% B 4 C particulates fabricated by powder metallurgy (P/M) technique were investigated. Microstructure Characterization of the composites revealed necklace distribution of B 4 C particulates in the matrix material and the presence of minimal micro-porosity. The X-ray diffraction (XRD) showed the formation of MgO and MgB 2 in B 4 C/Mg composites. Moreover, the results revealed that the hardness and wear resistance of the composites were higher than those of as-cast Mg ingot and increased with increasing amount of B 4 C particulates from 10 to 20 vol.%.

S S Babu - One of the best experts on this subject based on the ideXlab platform.

  • influence of hot isostatic pressing on the performance of aluminum alloy fabricated by ultrasonic additive manufacturing
    Scripta Materialia, 2018
    Co-Authors: Maxim N Gussev, Niyanth Sridharan, Z Thompson, Kurt A Terrani, S S Babu
    Abstract:

    Abstract Ultrasonic additive manufacturing (UAM) is a solid-state manufacturing technique employing principles of ultrasonic welding coupled with mechanized tape layering to fabricate fully functional parts. However, UAM-fabricated parts often exhibit a reduction in strength when loaded normal to the welding interfaces (Z-direction). Here, the effect of hot isostatic pressing (HIP) on UAM builds of aluminum alloy was explored. Tensile testing and Microstructure Characterization were conducted; it was established that HIP eliminated the brittle Z-direction fracture and improved the strength and ductility of the Z-direction specimens. HIP eliminated voids and produced recrystallized structure; however, welding interfaces survived the HIP treatment.

Yunping Li - One of the best experts on this subject based on the ideXlab platform.

  • building direction dependence of corrosion resistance property of ti 6al 4v alloy fabricated by electron beam melting
    Corrosion Science, 2017
    Co-Authors: Xiaojuan Gong, Yunping Li
    Abstract:

    Abstract Electrochemical measurements in 1 M HCl solution were performed to investigate the corrosion behaviour of Ti–6Al–4V alloy fabricated by electron beam melting (EBM) with cylindrical axes deviating from the building direction by 0°, 45°, 55°, and 90°. Microstructure Characterization before and after the tests was carried out by using a variety of methods The results suggested that the corrosion resistance of EBM alloy in 1 M HCl solution increased slightly in the order of 45°, 90°, 55°, and 0°. Such difference can be ascribed to the grain boundary density and β phase constitution, which varied with the building direction.