High-speed laser cladding was introduced to prepare a CoCrFeNiMo high-entropy alloy (HEA) coating. The microstructure, composition distribution, micromechanical properties, and corrosion resistance of the CoCrFeNiMo coating were characterized. As a result, the coating exhibited a dual FCC- and BCC-phase structure, and the grain size of the coating prepared through high-speed laser cladding was only 2~5 μm. The upper and lower parts of the coating were composed of equiaxed cellular crystals and slender columnar crystals, respectively. The interdendritic structure was a Mo-rich phase that was distributed in a network-like pattern. The nanoindentation tests revealed that the interdendritic BCC phase had high hardness and an elastic modulus as well as excellent resistance to deformation, while the intradendritic FCC phase possessed superior crack propagation resistance. In addition, the two phases could generate cooperative elastic deformation during the elastic deformation stage. The electrochemical performance of the coating was tested in 3.5 wt% NaCl solution, and the corrosion potential Ecorr and corrosion current density Icorr of the coating were −0.362 V and 3.69 × 10−6 A/cm2, respectively. The high-speed laser cladding CoCrFeNiMo HEA coating had excellent corrosion resistance thanks to the presence of the easily passivating element Mo and grain refinement.
18) can be recast as L for easy calculations. Another way to express (20) is , (21) 0 Aexmi *[ :b] [ eir e -l a b z ] [ Bex,.,]where A,,,,, and B, , , , , are coefficients to be determined by boundary and/or excitation conditions.
CONCLUDING REMARKSThus, we have derived expressions for the ordinary and the extraordinary modes propagating in the xz plane of a PBN medium. The ordinary modes are unaffected by the anisotropy and the periodic inhomogeneity of the PBN medium, but the extraordinary modes are. Simple expressions for the extraordinary modes have been found. These are applicable when the anisotropy parameter is small in magnitude. We expect PBNTFs to become important in the context of sculptured thin films for optical applications [12]. ABSTRACT Numerical analysis for computing resonant frequencies of uniaxially anisotropic cylindrical resonators is presented. The resonator is placed on a grounded isotropic substrate and is couered with a metallic tuning plate. The generalized impedance boundary conditions are employed along the axis of the resonator to simplify the boundary-calue problem. Ample numerical results are presented, explicitly showing the dependence of the resonant frequency on the variation in the elements of the permitticity tensor. 0 1996 John Wilqy & Sons, Inc.
the authors were able to achieve a minimum isolation of 16 dB.Finally, I think it would be important for the readers to understand why the authors decided to use cascaded (corporate-type) two-way sectorial structures to obtain the desired four-way combiner. It is well known that an intrinsic characteristic of the sectorial structure is its improved performance with larger number of output ports. Unless there are compelling reasons to select a cascaded structure one could realize the desired characteristics with far less complicated georne t ry .I REFERENCES 1.
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