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1

Digitale Medien

Self-diffusion of cobalt in coarse grained polycrystalline Ni-Co alloys at low temperature (1972)

Million, B. ; Cíha, K. ; Krejčí, J. ; [weitere]

Springer

Czechoslovak journal of physics 22 (1972), S. 534-536

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ISSN: 1572-9486

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01690962

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2

Digitale Medien

Stationary and quasistationary models of carbon redistribution in austenitic steel weldments (1985)

Kučera, Jar ; Million, B. ; Stránský, K.

Springer

Czechoslovak journal of physics 35 (1985), S. 1355-1361

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ISSN: 1572-9486

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract In this paper models describing carbon redistribution in austenitic steel weldments are presented. The stationary model (SM) is based on the assumption that the substitutional atoms do not diffuse, they are stationary. The quasistationary model (QSM) describes the C-redistribution even in the case in which the substitutional atoms diffuse in a narrow interval which is situated in the neighbourhood of the weldment interface. In developing the models the following assumptions were used: The “driving force” of carbon diffusion is the gradient of the chemical potential in which the C-C interaction is not taken into account (ε C C = 0); the molar volumes of the solid solutions under consideration are the same and constant in both parts of the weldment; the Kirkendall effect does not occur.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01772717

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3

Digitale Medien

Carbon redistribution in austenitic steel weldments (1986)

Kučera, Jar ; Million, B. ; Stránský, K. ; [weitere]

Springer

Czechoslovak journal of physics 36 (1986), S. 1170-1181

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ISSN: 1572-9486

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract In parts I and II of our papers (Czech. J. Phys.35 (1985) 1355 and36 (1986) 514) concerning carbon redistribution in austenitic steel weldments the stationary (SM) and quasistationary (QSM) models have been developed and applied in the analysis of Darken's and our own data. It was necessary, in deriving the quoted SM and QSM, to introduce some simplifying presumptions. The present part III gives the general solution (GS) of the problem. It is based on the theory of thermodynamics irreversible processes, and the resulting system of differential equations is integrated numerically. The properties and chances of the GS are demonstrated in comparison with experimental data and by different examples of the prediction of carbon redistribution. The events of the non-zero thermodynamic (εskCi) and diffusion (βskCi) interaction coefficients, of the Kirkendall effect, of the non-constant atomic volume effect and of the different Wagner's and Zupp-Stevenson expressions of carbon activity coefficientγ C are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01959608

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4

Digitale Medien

Concentration dependence of nickel diffusion in nickel-cobalt alloys (1971)

Million, B. ; Kučera, J.

Springer

Czechoslovak journal of physics 21 (1971), S. 161-171

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ISSN: 1572-9486

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract In the present paper the results of measuring the self-diffusion coefficients for Ni in Ni-Co alloy in the composition interval 0–100 at.% Co, and in the temperature range 1065–1290 °C are given. The measurements have been carried out by the Gruzin method using the radioisotope Ni-63. The curves indicating the concentration dependence of the diffusion coefficients calculated for differentaT m vaules (T m is the melting point at a given concentration,a is a number from the interval (0, 1)) are straight lines; this feature has been found in other solid solutions which slightly deviate from regularity as well. It results in simple equations for the concentration dependence of self-diffusion characteristicsD 0 andΔH.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01702804

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5

Digitale Medien

Stationary and quasistationary models of carbon redistribution in austenitic steel weldments (1986)

Kučera, Jar ; Kozák, V. ; Million, B. ; [weitere]

Springer

Czechoslovak journal of physics 36 (1986), S. 514-523

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ISSN: 1572-9486

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract In this IInd part of our paper (Czech. J. Phys. B35 (1985) 1355) the analysis of carbon uphill diffusion data is presented. The analysed data were measured in the polycomponent steel weldments. All of the data satisfy well the conditions for stationary model application. On the basis of the present analysis the carbon diffusivities (D 1 * ) appertaining to a non-alloyed austenite, the activity (ε C s ) and diffusion (β C s ) interaction coefficients are evaluated. A “Si anomaly” in Darken's experiments is observed and discussed. On the contrary to the other substitutional elements Mn, Cr and Mo, which decrease simultaneously C-activity and C-diffusivity, silicon increases the carbon activity and, at the same time, decreases its diffusivity in the Fe-C-Xs austenitic solid solutions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01597633

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