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Some Regularities of Continuous Solid Solutions of Alloy Systems

Jingkang GUO , Chonghe LI , Pei QIN , Honglin LIU and Nianyi CHEN(Shanghai Insitute of Motallurgy , Chinese Academy of Sciences , Shanghai , 200050 , China)

材料科学技术（英）

A modified Miedema model and pattern recognition technique are used to establish the criteriafor the formation of continuous solid solutions in alloy systems, and to study the occurrence ofthe melting temperature minimum of continuous solid solutions.

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On the Formability of Some Metastable Alloy Phases

Bo TANG , Deshan KANG , Pei QING , Weiming ZHANG and Nianyi CHEN(Shanghai Institute of Metallurgy , Chinese Academy of Sciences , Shanghai , 200050 , China)

材料科学技术（英）

Pattern recognition and neural network methods have been used to investigate the formability of metastable alloy phases, It has been found that some chemi cal bond parameters Such as valence electron number, electronegativity and metallic radii of cor-nponent elements are the dominating fac tors affecting metastable alloy phase formation. Some semi-empirical rules found in this way may be useful for the construction of expert system for materials design.

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Instability and Non-reproducibility of Gibbsite Precipitation Process in Alumina Powder Production

Mei HONG , Miaoxiu LIU , Weiming ZHANG , Bo TANG and Nianyi CHEN(Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , 200050 , China)

材料科学技术（英）

Gibbsite (Al2O3 3H2O) powder. used for alumina powder production. can be prepared by the decomposition of sodium alum inate solutions induced by dilution or partial neutral ization, This decomposition process exhibits an incubation period and instability or non-reproducibility in reaction kinetics, UV time-scanning spectra and Raman spectra change have been measured to investigate the solution in incubation period and the factors affecting the grain size of gibbsite precipitate

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Densification and Sintering Kinetics of Rare Earth (α′+ β′)-Sialon Composites

Hao WANG , T.S.YEN , Hanrui ZHUANG and Weiying SUN (State Key Lab. on High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai , 200050 , China)

材料科学技术（英）

The sintering processes of Re-(α' + β')-sialon composites (Re=Sm, Dy, Yb) have been investigated by using a specially designed high temperature dilatometer. The initial densification of various samples starts at about 1200℃, and the maximum shrinkage rate of these sialon composites occurs at about 1500℃. The light rare earth sialon has a noticeably tower densification temperature and a higher final shrinkage. The sirtering kinetics of Re-(α' +β')-sialonare much more complex. The Kingery's liquid phase sintering model appears to be applicable,but the mechanism of mass transport in stage two appears to be changeable. The controlling factor shiffs from solution-precipitation to diffusion when densification process proceeds from the earlier part to the later part of this stage.

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