448 Result(s)
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Article
Yi**g Yong
Classical Mechanics
Polymer Sciences
Solid Mechanics
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Article
Stress corrosion cracking of Al-Zn-Mg alloy AA-7039 by slow strain-rate method
The stress corrosion behaviour of Al-Zn-Mg alloy AA-7039 in an aqueous 3.5 wt % Nad solution (pH=1) was studied with the specimens under constant strain rate as function of ageing state and cold working. The t...
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The phase transformations and structure of Cu83.34Pt16.66 alloy
The structure and phase transformation of Cu83.34Pt16.66 alloy have been investigated by X-ray diffraction, TEM, differential thermal analysis, and measurements of electrical resistance and hardness. It was found...
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Article
Formation of solid-liquid interface in ferroelectric particle dispersion and its effect on the dispersion stability
A model has been proposed for the formation of the ferroelectric solid-liquid interface in the non-electrolyte dispersion system. Bulk properties as well as the surface properties of the dispersing solid could...
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The effect of whisker length on the mechanical properties of alumina-SiC whisker composites
Silicon carbide whisker (20v/o)-reinforced alumina composites with various whisker lengths were prepared by hot pressing, then the dependences of whisker length on flexural strength and fracture toughness of t...
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HREM study of atomic image of single crystal indium phosphide
This paper reports some experimental results of high resolution electron microscopy (HREM) studies on single crystal indium phosphide (InP) along the [0 0 1] zone axis. Using 400 kV electrons, with defocus val...
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Article
Defects induced by P+-implanted in silicon
Cross-section transmission electron microscopy (X-TEM) has been used to show the microstructures and the defects in P+-implanted (100) silicon crystals. P+ implantation was done at room temperature with the energ...
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Sinter-forged YBa2Cu3O7−x superconducting ceramics from the spray-roasted powders
The effect of applying a uniaxial stress, while varying the temperature and the time of sinter-forging, on the microstructure and critical current density of the sinter-forged YBa2Cu3O7−x ceramics has been invest...
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Article
Ceramic fibres from polymer precursor containing Si-O-Ti bonds
Polycarbosilanes containing titanium alkoxide as pendant groups (atom ratio Ti/Si = 0.07 and 0.15) were synthesized. These polymers were melt-spun and then heat-treated in a vacuum, in oxygen or ammonia gas fl...
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Formation mechanism of Fe80Si8B12 metallic glass
In order to gain an understanding of the glass-forming mechanism during the rapid quenching of a metallic alloy, the nucleation and growth process of the crystalline phase which competes with the metallic glas...
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Low-cycle fatigue crack advance and life prediction
A new concept for a fatigue process zone within which the actual degradation of the material takes place is proposed. This zone is described as the region in which the stress distribution of the HRR field appr...
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Hydrothermal synthesis and structural investigation of sodium zirconium silicophosphates
The hydrothermal reactions of NaZr2(PO4)3 with Na2SiO3 in excess NaOH at 300°C have been investigated. The pure precursor phases have been obtained at the reactant ratio of NaZr2(PO4)3∶Na2SiO3 from 1∶1 to 1∶3.2. ...
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Article
Cross-sectional observation of NaClO stain-etched Al0.5Ga0.5As/GaAs multilayer by atomic force microscopy
The cross-section of multilayered Al0.5Ga0.5As/GaAs epitaxial structure was investigated by atomic force microscopy (AFM). For the first time, a 5% NaClO etchant was employed to discern each layer and a clear cro...
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Preparation of spherical Zr0.8Sn0.2TiO4 powder by ultrasonic spray pyrolysis
Fine, spherical Zr0.8Sn0.2Tio4 powders were prepared by spray pyrolysis, using an ultrasonic transducer, from an aqueous solution of metal chlorides. The synthesized powders had a spherical morphology and many sh...
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Article
Dispersion characteristics of the complex permeability-permittivity of Ni-Zn ferrite-epoxy composites
The effects of volume fraction and particle size of ferrite on the electric and magnetic properties of epoxy composites containing Ni-Zn ferrite were investigated. The composites were prepared by the cement mi...
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Article
The formation and phase stability of lead magnesium niobate in the presence of a molten flux
The formation of perovskite Pb(Mg1/3Nb2/3)O3 (PMN) by the molten salt synthesis method using sulphate flux has been investigated as a function of calcination temperature and mole ratio between Li2SO4 and Na2SO4. ...
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Morphology and growth characteristics of Si3N4 whiskers made by pyrolysis of amorphous Si-N-C powders
The morphology and growth characteristics of α-Si3N4 whiskers grown by pyrolysis of amorphous Si-N-C powders were investigated mainly by TEM. It was found that the whiskers exhibited various morphologies includin...
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Static creep behaviour of Al-Zn-Mg and Al-Zn-Mg-Cu alloys
The creep behaviour of Al-Zn-Mg (7039) and Al-Zn-Mg-Cu (7075) alloys is evaluated at elevated temperatures (443≦T≦533 K and 483≦T≦563 K) under constant stresses between 49 and 123 MPa, respectively, in a custo...
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Microstructure and mechanical properties of yttria-stabilized tetragonal zirconia polycrystals containing dispersed TiC particles
The microstructure and mechanical properties of hot-pressed yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) ceramics containing up to 30 vol % TiC particles were studied. Adding TiC particles to Y-T...
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Article
Mechanical alloying in the Al-Bi alloy system
Mechanical alloying (MA) was carried out to investigate the MA behaviour of the immiscible Al-10, 30 at % Bi alloys. After the MA processing, the Al and Bi were finely and homogeneously alloyed. The Bi crystal...
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The effect of Cr2O3 additive on the electrical properties of ZnO varistor
The effect of Cr2O3 additive on the leakage conduction and threshold voltage characteristics of bismuth-based ZnO ceramic varistor was studied. The leakage conduction in the voltage range below the threshold v...
