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HIGH TEMPERATURE OXIDATION AND STRUCTURE OF SCALE AND WHISKERS FOR Fe-Ni-Cr SEALING ALLOYS

DONG Zhili , MA Jusheng , TANG Xiangyun , YOU Liang Tsinghua University , Beijing , China lecturer Department of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China

金属学报(英文版)

The oxidation rate,the growth,morphology and structure of oxide scale and whiskers for Fe-Ni-Cr sealing alloys in H_2-H_2O atmosphere at high temperatures have been studied. The growth rate of scale is controlled by diffusion.The scale is composed of Cr_2O_3 and spinel(Fe,Mn)O·Cr_2O_3 and the oxide ...

关键词: oxidation , null , null , null

DESIGN AND PREPARATION OF SILICON NITRIDE COMPOSITE WITH HIGH FRACTURE TOUGHNESS AND NACRE STRUCTURE

Y Huang , H.N Hao , Y.L. Chen and B.L.Zhou (1)Department of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China 2)Institute of Metal Research , Chinese Academy of Sciences , Shenyang 110015 , China Manuscript received 26 August 1996)

金属学报(英文版)

A new way of designing and preparing silicon nitride ceramic composite with high fracture toughness and nacre structure has been proposed. To mimic the laminated structure of nacre, Si_3N_4 matrix ceramic layer can be obtained through compacting rolling method. To mimic the secondary toughening of n...

关键词: :secondary toughening , null , null , null

AGING PRECIPITATION OF Cu-Zr AND Cu-Zr-Si ALLOYS AND AFFECTED BY COLD WORKING

DONG Zhili TANG Xiangyun Tsinghua University , Beijing , ChinaHORI Sgigenori FUJITANI Wataru Faculty of Engineering , Osaka University , Japan DONG Zhili Dept.of Material Science and Engineering , Tsinghua University , Beijing 100084 , China

金属学报(英文版)

The hardness and electrical conductivity of Cu-Zr and Cu-Zr-Si alloys varying with differ- ent aging regimes were measured and the factors influencing the electrical conductivity were analysed.It is believed that a little Si can refine the precipitates and improve the resistance to softening.The imp...

关键词: aging , null , null

PREPARATION OF B-N FILMS BY ION BEAM ASSISTED DEPOSITION

JIANG Hai TAO Kun LI Hengde Tsinghua University , Beijing , China lecturer , Department of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China

金属学报(英文版)

BN films,synthesized by ion beam assisted deposition,were analysed by RBS,AES, IR spectra and TEM.Formatiom of c-BN phase was shown not only by IR spectra at absorption peak of 1100 cm~(-1),but also by electron diffraction pattern.The results of AES demonstrate an effect of N~+ implantation near the...

关键词: ion beam assisted deposition , null

EXTRACTION KINETICS,SYNERGISTIC EFFECTS AND INTERFACIAL CHEMISTRY FOR D_2 EHPA MPA-Fe~(3+) MIXED EXTRACTION SYSTEM

YU Jingfen LIU Difei Tsinghua University , Beijing , China professor , Dept.of Chemical Engineering , Tsinghua University , Beijing 100084 , China

金属学报(英文版)

The thermodynamics of micella formation,interfacial characteristics,synergistic effects and interfacial kinetics for synergistic extraction system D_2 EHPA-MPA-Fe~(3+) have been studied.It was found that D_2EHPA in the mixed system strongly exhibits the effect on the micella formation thermodynamics...

关键词: interfacial chemistry , null , null , null

APPLICATION OF MOLECULAR ORBITAL THEORY TO ANALYSIS OF PHASE STABILITY FOR ALLOYS

YIN Hong TAO Kun PAN Jinsheng LI Hengde Tsinghua University , Beijing , China professor.Department of Materials Science and Engineering , Tsinghua University , Beijing 100084 , China

金属学报(英文版)

The critical _d vahues ( _ ) of the γ/(γ+σ).γ/(γ+μ) and γ/(γ+γ') phase boundaries in some ternar alloy phase diagrams at various temperatures are calculated by averaging the _d values of sererai selected characteristic points at the phase boundaries.Approxmate equations for the temperature depende...

关键词: molecular orbital theory , null , null

CREEP FRACTURE OF INTERMETALLIC COMPOUND(Fe_(60)Ni_(40))_3(V_(98)Ti_2)

YAO Xuexing KANG Feiyu CHEN Nanping Tsinghua University , Beijing 100084 , China

金属学报(英文版)

The creep fracture behavior of intermetallic compound(Fe_(60)Ni_(40))_3(V_(98)Ti_2)has been studied. The variation of dislocation substructure was observed with TEM in the process of steady-state creep.It is found that there exists a large amount of stacking faults,dislocation pairs and also high de...

关键词: intermetallic compound , null , null , null

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