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2006年09月28日

【期刊论文】Application of the cluster-site approximation (CSA) model to the f.c.c. phase in the Ni-Al system

杜勇, F. Zhanga, *, Y.A. Changb, Y.Dub, S.-L. Chena, W.A. Oatesc

Acta Materialia 51(2003)207-216,-0001,():

-1年11月30日

摘要

The modified cluster-site approximation (CSA) model has been used to model the f.c.c. phases (ordered L12 and disordered A1) in the Ni-Al system. The CSA model has the advantage over the cluster variation method (CVM) in that the independent variables in the free energy functional are the site probabilities and not the cluster probabilities. Unlike the zeroth approximation, however, the CSA takes short-range order into consideration, an essential requirement for describing phases that undergo an order/disorder transition, as does the f.c.c. phase in the Ni-Al system. By using the modified CSA model, we have been able to obtain an improved phenomenological description of this system with the use of fewer model parameters than used in previous descriptions. The topology of the calculated metastable f.c.c. phase diagram is similar to the one obtained using a 'first-principles'-CVM approach, whereas the f.c.c. phase diagrams based on the previous phenomenological descriptions are unsatisfactory.

Cluster-site approximation, Nickel alloys, Phase diagrams, Order-disorder phenomena, Thermodynamics

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2006年09月28日

【期刊论文】Diffusion coefficients of some solutes in fcc and liquid Al: critical evaluation and correlation

杜勇, Yong Dua, b, *, Y.A. Changb, Baiyun Huanga, Weiping Gonga, Zhanpeng Jina, Honghui Xua, Zhaohui Yuana, Yong Liua, Yuehui Hea, F.-Y. Xiec

Materials Science and Engineering A363(2003)140-151,-0001,():

-1年11月30日

摘要

The diffusion coefficients of several transition elements (Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn) and a few non-transition elements (Mg, Si, Ga, and Ge) in fcc and liquid Al are critically reviewed and assessed by means of the least-squares method and semi-empirical correlations. Inconsistent experimental data are identified and ruled out. In the case of the elements, for which plentiful experimental data are available in the literature, the least-squares analysis gives rise to the activation energies and pre-exponential factors in an Arrhenius equation. For the elements with limited experimental data or no data at all, the diffusion parameters are estimated from two semi-empirical correlations. In one correlation, the logarithmic pre-exponential factors are plotted against the activation energies for various elements in Al. In the other correlation, the activation energies are shown as a function of valences relative to Al. The diffusion coefficients calculated by using the evaluated diffusion parameters agree reasonably with the reliable experimental data. The proposed semi-empirical correlations are used to predict the diffusion coefficients of a few elements in liquid Al. A satisfactory agreement between the predicted and measured diffusion coefficients is obtained.

Aluminum alloys, Impurity diffusion coefficient, Semi-empirical correlations, Diffusion modeling

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2006年09月28日

【期刊论文】Thermodynamic properties of the Al-Nb-Ni system

杜勇, Yong Dua, b, *, Y.A. Changa, Weiping Gongb, Baiyun Huangb, Honghui Xub, Zhanpeng Jinb, F. Zhangc, S.-L. Chenc

Intermetallics 11(2003)995-1013,-0001,():

-1年11月30日

摘要

This paper provides a consistent thermodynamic data set for the whole Al-Nb-Ni ternary system via thermodynamic modeling. The order/disorder transitions between disordered bcc_A2 and ordered bcc_B2 phases as well as between disordered fcc-A1 and ordered L12 phases are treated using a two-sublattice model. The calculations indicate that the disordered and ordered phases can be described with a single equation. All of the experimental phase diagram data available from the literature are critically reviewed and assessed using thermodynamic models for the Gibbs energies of individual phases. Inconsistent experimental information is identified and ruled out. Optimal thermodynamic parameters are then obtained by considering reliable literature data. Comprehensive comparisons between the calculated and measured phase diagrams show that almost all the accurate experimental information is satisfactorily accounted for by the present thermodynamic description.

A., Ternary alloy systems, B., Phase diagram, B., Thermodynamic and thermochemical properties, B., Order/, disorder transformations, E., Phase diagram prediction

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2006年09月28日

【期刊论文】Thermodynamic assessment of the Mo-Nb-Ta system

杜勇, Wei Xiong, Yong Du*, Yong Liu, B.Y. Huang, H.H. Xu, H.L. Chen, Zhu Pan

Computer Coupling of Phase Diagrams and Thermochemistry 28(2004)133-140,-0001,():

-1年11月30日

摘要

Thermodynamic optimizations of the Mo-Nb, Mo-Ta, and Nb-Ta binary systems were performed by considering the experimental phase diagram and thermodynamic data available from the literature. The Mo-Nb-Ta ternary system was then synthesized from the descriptions of the binary sides. The calculated thermodynamic properties as well as phase diagrams for the binary systems agree well with the experimental ones. In the case of the ternary system, several isothermal sections were calculated by extrapolation from the three boundary systems. The model-predicted liquidus temperatures in the ternary system are in reasonable agreement with the experimental data. The computed liquidus projection and a set of model parameters describing the Gibbs energies of the assessed phases are also presented.

Mo-Nb-Ta system, Phase diagram, Thermodynamic calculation

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2006年09月28日

【期刊论文】thermodynamic description of the Al-Be system: Modeling and experiment

杜勇, Zhu Pan, Yong Du*, B.Y. Huang, Yong Liu, R.C. Wang

Computer Coupling of Phase Diagrams and Thermochemistry 28(2004)371-378,-0001,():

-1年11月30日

摘要

The Al-Be system is investigated via three steps. In the first step, all of the experimentally measured phase diagram and thermodynamic data available in the literature are critically reviewed. On the basis of the assessed phase diagram, in the second step, eight decisive samples are prepared by arc melting of Al and Be pieces and annealing at 600℃ for eight days. Water-quenched samples are analyzed using differential thermal analysis (DTA), X-ray diffraction (XRD), optical microscopy, and scanning electron microscopy (SEM) techniques. In the last step, an optimal thermodynamic data set for the Al-Be system has been obtained by considering the present experimental data and the reliable literature data. The calculated phase diagram and thermodynamic properties agree well with the accurate experimental values.

Al-Be phase diagram, Thermodynamic calculation, X-ray diffraction, Differential thermal analysis

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  • 杜勇 邀请

    中南大学,浙江

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