Since most of alloy design is empirical or semi-empirical,it isessential to pay more attention to the basic research on phase transformatio-ns and crystal defects.Several examples are given in order to illustrate theadvances in these topics by computer si

By the use of new-designed transformation internal frictioninstrument,in which specimen can quickly heated and quenched by argonspraying,changes in internal friction and frequency during the course of baini-cti transformations in 18Cr2Ni4WA steel and Cu-2

This paper shows that the fractal dimension D_m,as determi-ned by the perimeter-area relation is not the intrinsic fractal dimension,D。of a fractured metal surface.The measured value of D_m depends on thelength of yardstick used to measure the perimeter a

The relationship between fatigue crack propagation thresholdvalue and the fractal dimension as well as roughness of near-threshold fract-ure surface has been studied in this paper.It was shown that the fractaldimension is closely associated with the fract

The tensile properties and fracture characteristics of a Si-Mn-Cr-Mo series hot-rolled dual phase steel under three straining rates andat temperature ranges from RT to -100℃ have been studied.It was foundthat steel has a good ductility at low temperatures

The characteristics of fatigue cracks initiation and propagationin a SiC(W) reinforced Al alloy have been observed by SEM.The effect ofthe SiC(W) distribution,the interface between SiC(W) and matrix and defectsin the matrix on fatigue crack initiation has

In this paper,the adhesion between magnetron sputter deposited1Cr18Ni9Ti stainless steel coating and a carbon steel substate was investig-ated.The tensile test was proceeded under SEM with continuous observation.The experimental resuls showed that the adh

A new type of composite material made by 4J29 (Kovar) alloyand oxygen-free copper (OFHC) has been studied.The external part of thismaterial is 4J29 alloy and the internal core is UT1(OFHC).This materialwas mad by thermal pressing technology and afterwards

The samples of Bi-Sr-Ca-Cu-O superconductors was preparedby sintering and casting techniques have been studied.Two super conductivephases have been observed in a casting sample,which was casted at 1100℃and heat treated at 850℃ after solidification.The mag

The effect of V content on the temperature(T) dependence ofsusceptibildity(χ),and resistivity(ρ) for γ-Fe-Mn and γ-Fe-Mn-Al alloyshas been investigated over the temperature range of 77—750K and 100—520Krespectivly.A Nèel transition accompained by an anoma

The Three kinds of fibers with 72,80 and 95 wt-% Al_2O_3 wereinvestigated.The composition,structure and rheological property of the solfor spinning physical and chemical changes of the gel fibers in heating processand thermal behaviour of the finished fib

Five metal-silicon systems (Ni/Si,Cu/Si,Ti/Si,Nb/Si,Mo/Si) were chosen for this experiment and the results in a verity of condi-tions were summarized.The phase transformation by ion beam induced isnon-equilibrium process.This process might change the comp

Silicon carbide whiskers were synthesized by using rice hulls,ash and carbon black as raw materials and at the temperatures between 1400—1600℃. Fe,H_3BO_3 and NaCl were seperately as the catalysts and theirinfluences to SiC whiskers growth were discussed.

The effects of vinyl content and molecular weight of 1,2-poly-butadiene(1,2-PB) on the morphology and properties of its blends withpolypropylene(PP) were studied by various techniques.It is shown that 1,2-PB is compatible with PP to some degree which depe

The stress-strain curves and dynamic mechanical properties ofpure epoxy resin and epoxy copolymer with shrinkage or equal-density or exp-ansion obtained by copolymerizing epoxy resin with various amounts of expan-ding monomer NSOC have been measured.The b

The kinetics of the reaction of photoorosslinking of LDPE-BPTAIC system was studied by deriving the kinetic equation and comparing withthe results from extraction,swellingand thermal-elongation experiments.Theroles of the crosslinker played in the course

Usingp p-henylenediamine as essential material and after fivestep reactions,2.5-diamino-1,4-benzenedithiol dihydrochloride has been obtai-ned (monomer 5).Monomer 5 was polymerized with terephthalic acid in poly(phosphoric acid) to obtain PBT.The film and