A modified ribbon-on-ring apparatus has been developed for determina-tion of variation of wear resistance with sliding speed and tempered temperature for twocobalt base amorphous.alloys.The distribution of normal pressure obtained by theoreticcalculation

ABSTRACT Permeability and diffusivity of hydrogen in JBK—75 alloy were measuredover the temperatue range of 200 to 420℃ using a gaseous permeation technique.The ef-fects of γ′ precipitate phase in the alloy on hydrogen permeation behaviour were investi-ga

In this paper the rheological behavior of Al-Cu alloys in solid-liquidcoexistence zone has been investigated.The concepts of the Kelvin body temperature andits effective temperature zone have been proposed.The rheological behavior of the Kelvinbody in sol

Cu-Ge amorphous films with an extensive composition range have beenprepared by vapour quenching onto cooled substrates at liquid nitrogen temperature.Theanalyses of electric resistivity,electron microscopy and diffraction indicate that the amor-phous form

The phase diagram of Cu-Al system has been fully utilized to derive severalthermodynamic parameters of Cu-Al alloys on the basis of the regular solution model.Astatistical method has also been used to deal with α→α′and β→β′ ordering transitions ac-company

The effect of aluminizing on the function of LPPS metal-oxide diffusionbarrier has been investigated.It is found that aluminizing at 900℃ for 3h can improve theeffectiveness of diffustion barrier in reducing interdiffusion between coating and substrate.Wi

LY12CZ alluminium alloy is a superplastic material as its commercial state.With a gram size of 15.3 μm and under the condition of 490℃ and ε_0=1.67x10~(-4)s~(-1),themaximum total elongation of this material arrives at 346% and its m-value at 0.52—0.6.This

A study has been made of the relationship between the microstructuresformed in rapidly solidifed Al-5Si-lTi alloy and the precipitation processes during an-nealing at 250 to 550℃ for 1 to 100h.The as-solidified microstructure has been found to bestable up

The metallographic examination method was used to measure thenucleation kinetics and growth kinetics of ferrite formed at deformed austentite grainboundary.The nucleation kinetics equation for ferrite under austenite deformation was de-rived based on the

Based on a theoretical model of the critical crack size α_c for low-tempera-ture brittle fracture in structural steel,initially established by the authors and verified byexperimental results on a mild steel A3,the present investigation was conducted to ex

The feature of the bond between layers of consolidated amorphous ribbonwas investigated by means of microscorpy and thermal infrared radiaton.The results showthat the bond between layers of consolidated amorphous ribbon is tight and there occurspartial pl

Values of plane strain fracture toughess,for polycrystalline BaTiO_3,VO_2 and BiSrCaCu_2O_y have been measured by using three-point bending method aboveand below their phase transition temperatures.It is shown that toughnesss of the materialswill be impro

Si_3N_4 films have been deposited on Si wafers at temperature range of 100—200℃ by photo-CVD technique.This paper presents the relationship between the deposi-tion rate and other deposition parameters of the films.The physical,chemical and mechani-cal pro

It is proved in practice that the strength distribution of brittle material isWeibull's.In this paper,the material service life problems which strength is Weibull distri-bution are researched.The conclusion is that the materials service is Weibull distrib

The quantitative relations of aging time with some mechanical propertiesfor vulcanizates were derived by the combination of statistical mechanics with aging kine-tics, based on the microstructural model of the networks.According to the relations,fuorkinds

The morphology of particles of PVC paste resins was observed by using ascanning electron microscope.The gelation process was measured by using a Brabenderplastometer.The results show that morphology of secondary particles of PVC paste resinscan be divided

By means of uniaxial tension,uniaxial compression and hot extrusion,theplastic deformation behaviors of the SiC_w/Al composite made by squeeze casting methodwere investigated in this paper.The results show that while the stress state of the compositechang

This paper presents a method of carbon fiber coating with silica fromsol-gel process.Carbon fibers are passed through hydrolytic solution of tetraethoxysiliane(TEOS).which then chemically converted by drying and pyrolysis to form silica coating.The coatin