10,516 Result(s)

Article

Microstructure, mechanical properties and heat treatment of new matrix steel 65Cr4W3Mo2VNb with high strength and toughness

A new matrix steel 65Cr4W3Mo2VNb, identified as 65Nb (Cb), is described. It has high strength and high toughness, obtained by an optimum combination of alloying, heat treatment and thermochemical treatment. It...

Cui Kun, Hu Zhenhua, Zhao Juhua in Journal of Heat Treating (1980)

Article

Structural deformation in polyethylene during cold-drawing

A permanganic etching technique is used to study the morphology of blow-moulded polyethylene before and after cold-drawing. The morphological changes that occur in the necked region during drawing are also exa...

P. E. Reed, G. Q. Zhao in Journal of Materials Science (1982)

Article

Theoretical analysis of the deflection test used in single-surface oxidation of metallic samples

On the basis of the experimental results on deflection obtained by Delaunay during single-surface oxidation of metallic samples, a theoretical analysis of this deflection test was carried out. Two important pr...

J. G. Zhao, A. M. Huntz in Journal of Materials Science (1984)

Article

Studies of Electrical Current-Induced Liquid Phase Epitaxy of Ga_1−xAl_xAs:Si

In this paper, a novel system of electrical current induced liquid phase epitaxial apparatus is presented. Electroepitaxial growths of Ga_1−xAl_xAs on thin GaAs substrate were carried out at constant temperature wi...

**an-Fu Zeng, Gang-Zhao Yao, Zhao-Haon Huang in MRS Online Proceedings Library (1985)

Article

Amorphous W-Zr Films as Diffusion Barriers Between Al and Si

Cosputtered W₇₀Zr₃₀ and W₄₀Zr₆₀ films are investigated as diffusion barriers between Al and Si. W-Zr alloys of both compositions were determined by x-ray diffraction to crystallize at 900°C on Al₂O₃ substrates. O...

F. C. T. So, X.-A. Zhao, E. Kolawa, J. L. Tandon… in MRS Online Proceedings Library (1985)

Article

Improvement of Thermal Fatigue Resistance of a Wrought Nickel-Base Superalloy by Laserglaze

Laserglaze with appropriate post heat treatment has improved the thermal fatigue resistance of a wrought nickel-base superalloy. It was found that laserglaze was able to eliminate the blocky MC phase, refine g...

Zhao Qi, Ge Yunlong, Hn Zhuangqi, Jiang Ming… in MRS Online Proceedings Library (1985)

Article

Moving Species in Pt₂Si, Ni₂Si and CrSi₂ Formed by Ion Mixing and Thermal Annealing

We have determined the dominant moving species during the formation of CrSi₂, Ni₂Si, and Pt₂Si by irradiating with 600 keV Xe ions thin bilayers of evaporated metal on silicon and silicon on metal above room temp...

X. A. Zhao, K. Affolter, M.-A. Nicolet in MRS Online Proceedings Library (1985)

Article

Fatigue Properties of a Ni-Base Superalloy Treated by Laserolazing

Fatigue properties of a wrought Ni-base superalloy treated by laserglazing and post heat treatments have been investigated. Tests have been run both by the rotating bend fatigue at 700°C and the vibration fati...

Jiang **, Hu Zhuang Qi, Shih Changxu, Zhu Guizeng… in MRS Online Proceedings Library (1986)

Article

The Effect of Light Soaking on the Photoconductivity Response in a-Si:H

The temperature dependences of response time t_r and steady state photoconductivity (PC) were used to deduce the DOS at energies above the dark Fermi level. The t_r and PC of annealled state A and light soaked stat...

Qiu Changhua, Wu Wenhao, Zhao Shifu, Han Daxing in MRS Online Proceedings Library (1986)

Article

Study of Trap** and Recombination in a-Si:H by Means of Infrared Enhancement Spectra of Photoconductivity

IR re-excitation of non-equilibrium carriers in undoped a-Si:H has been used to probe the profile of the distribution of deep traps. In a dual-beam experiment, after turning off a pump light, the trapped carri...

Wu Wenhao, Qiu Changhua, Zhao Shifu, Han Daxing in MRS Online Proceedings Library (1986)

Article

Mixed-alkali effect in fluorozirconate glasses

Zhao **ujian, Tadashi Kokubo, Sumio Sakka in Journal of Materials Science Letters (1987)

Article

Interfacial Reactions of Mo with Al: Ion mixing Versus Thermal Annealing

Interfacial reactions induced by ion beam mixing and furnace annealing in Al/Mo bilayers are investigated. The amount of interfacial ion m’xing, 4Dt, follows a linear dose dependence for irradiation temperatur...

E. Ma, A. J. Brunner, T. W. Workman, C. W. Nieh… in MRS Online Proceedings Library (1987)

Article

Mixed alkali effect in elastic properties of glasses in the ZrF₄-BaF₂- AlF₃-RF system (RF = LiF-NaF, NaF-KF)

The elastic properties, such as Poisson's ratios, shear modulus, Young's modulus and bulk modulus, have been determined with glasses of the compositions 48ZrF₄ · 24BaF₂ · 8AlF₃ · 20RF, where RF is the LiF-NaF or ...

**ujian Zhao, Hiromltsu Kozuka, Sumio Sakka in Journal of Materials Science (1987)

Article

Characterization of MBE Grown GaAs with Isoelectronic Do** of Indium or Antimony

The effects of In and Sb on the concentration of electron traps in MBE grown n-type GaAs are investigated. Two traps, labeled M3 and M6, dominate the DLTS spectrum. It is observed that at growth temperatures o...

A. Z. Li, H. K. Kim, J. Jeong, J. Zhao, T. E. Schlesinger… in MRS Online Proceedings Library (1987)

Article

Spectroscopy of Impurities and Complex Defects in Silicon in Electric and Microwave Fields

We report a detailed study of the photoluminescence (PL) intensity of bound excitons (BE:s) in silicon, related to shallow impurities and deep complex defects, as a function of DC and high frequency AC (9GHz) ...

M. Godlewski, H. Weman, F.P. Wang, B. Monemar, W.M. Chen… in MRS Online Proceedings Library (1987)

Article

Ion Mixing of Near-Noble Transition Metal Films on Evaporated and Large-Grained Aluminum Substrates

Ion mixing experiments using Xe ions at temperatures ranging from 77K to about 450K were conducted on Al/Ni and Al/Pt couples. Evaporated polycrystalline Al films and large-grained Al crystals were used as sub...

E. Ma, X.-A. Zhao, M A. Nicolet in MRS Online Proceedings Library (1987)

Article

Active Sites in Oxide-Promoted Metal Catalysts – Evidence for the Significance of Perimeter Sites in AlO_x and MnO_x/Ni(lll) Catalysts

MnO_x (0.2 < × < 0.5) and AlO_x (0.5 < × < 1.1) /Ni(lll) model catalysts were prepared by depositing the oxides onto clean Ni(111) surfaces under ultrahigh vacuum conditions, with the average oxide cove...

Yong-Bo Zhao, Tzer-Shen Lin, Yip-Wah Chung in MRS Online Proceedings Library (1987)

Article

Corrosion Fatigue Crack Initiation in a Mode II Notch Specimen

The stress intensityK _II of a Mode II specimen was calculated using a finite element methodvia theJ integral. The site, direction, and the threshold value for c...

Wu-Yang Chu, Che-Mei Hsiao, Yu-Sheng Zhao in Metallurgical Transactions A (1988)

Article

Intercrystalline structure distribution in alloy 304 stainless steel

The intercrystalline structure distribution function (ISDF) describes the probability density for the occurrence of grain boundaries in the polycrystalline medium with five specified geometrical parameters: th...

Junwu Zhao, Jan S. Koontz, Brent L. Adams in Metallurgical Transactions A (1988)

Article

On the carrier profiling of GaAsSb/GaAs heterostructures

Carrier profiles of MBE grown Ga(As,Sb)/GaAs heterostructures were studied. In low Sb content samples of Ga(As,Sb)/GaAs grown by MBE the experimentally measured carrier profiles exhibit double dips in concentr...

J. H. Zhao, A. Z. Li, T. E. Schlesinger, A. G. Milnes in Journal of Electronic Materials (1988)