Abstract
The coefficient of 65Zn heterodiffusion in the Mg17Al12 intermetallic compound (β-phase) and the eutectic alloy Mg-33.4 wt.% Al was measured in the temperature region 598 – 698 K using serial sectioning and residual activity methods. The diffusion coefficient of 65Zn in the intermetallic can be written as ΔI = 1.5 × 10– 2 m2 s –1 × exp( – 154.3 kJ mol –1/RT). At temperatures T ≥ 648 K, where the mean diffusion path is greater than the mean interlamellar distance in the eutectic, the effective diffusion coefficient Δeff = 2.7 × 10– 2 m2 s –1 exp(–155.1 kJ mol– 1/ RT) was evaluated. At two lower temperatures, the diffusion coefficients 65Zn in interphase boundaries were estimated: Δb (623 K) = 1.6 × 10 –12 m2 τ– 1 and Δb (598 K) = 4.4 × 10– 13 m2 τ–1. The specific (Mg)/β interfacial energy γ = 140 mJ m– 2 was assessed from measurement of the time dependence of interlamellar distance during isothermal anneal.
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The work was supported by the Grant agency of the Czech Republic (contract number 106/05/2115) and by the Czech Academy of Sciences (project number AV'Z20410507). The authors would like to express their thanks to Dr. M. Svoboda for the SAD analysis and its interpretation.
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© 2006 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Editorial
- Diffusion of 65Zn in the Mg17Al12 intermetallic compound and in the Mg-33.4 wt.% Al eutectic
- Thermodynamic modeling of the sodium alanates and the Na–Al–H system
- Thermodynamic assessment of the systems La2O3–Al2O3 and La2O3–Y2O3
- Re-evaluation of phase equilibria in the Al–Mo system
- EBSD and EDX analysis at the cladding–substrate interface of a laser clad railway wheel
- Thermodynamic properties of liquid silver–indium–antimony alloys determined from e.m.f. measurements
- Density and excess volumes of liquid copper, cobalt, iron and their binary and ternary alloys
- Thermodynamic investigation of Co–Cr alloys, III: Thermo-analytical measurements using DSC and DTA techniques
- Effect of a low frequency electromagnetic field on the direct-chill (DC) casting of AZ80 magnesium alloy ingots
- Microstructure of the “white layer” formed on nitrided Fe-7 wt.% Cr alloys
- The effect of ageing on tensile behaviour, mode I and mixed mode I/III fracture toughness of 7010 aluminium alloy
- Plane bending fatigue behavior of interstitial-free steel at room temperature
- Fracture behaviour of ultrafine-grained materials under static and cyclic loading
- Influence of process parameters on particle characteristics using a combined pressure-swirl-gas atomizer
- Processing and mechanical behaviour of a dual scale particle strengthened copper composite
- Electrochemical characterisation of magnesium and wrought magnesium alloys
- Progress in understanding the metallurgy of 18% nickel maraging steels
- Quality Management Basics on a High Level
- Personal
- News
- Frontmatter
- Editorial
- Editorial
- Basic
- Diffusion of 65Zn in the Mg17Al12 intermetallic compound and in the Mg-33.4 wt.% Al eutectic
- Thermodynamic modeling of the sodium alanates and the Na–Al–H system
- Thermodynamic assessment of the systems La2O3–Al2O3 and La2O3–Y2O3
- Re-evaluation of phase equilibria in the Al–Mo system
- EBSD and EDX analysis at the cladding–substrate interface of a laser clad railway wheel
- Thermodynamic properties of liquid silver–indium–antimony alloys determined from e.m.f. measurements
- Density and excess volumes of liquid copper, cobalt, iron and their binary and ternary alloys
- Thermodynamic investigation of Co–Cr alloys, III: Thermo-analytical measurements using DSC and DTA techniques
- Applied
- Effect of a low frequency electromagnetic field on the direct-chill (DC) casting of AZ80 magnesium alloy ingots
- Microstructure of the “white layer” formed on nitrided Fe-7 wt.% Cr alloys
- The effect of ageing on tensile behaviour, mode I and mixed mode I/III fracture toughness of 7010 aluminium alloy
- Plane bending fatigue behavior of interstitial-free steel at room temperature
- Fracture behaviour of ultrafine-grained materials under static and cyclic loading
- Influence of process parameters on particle characteristics using a combined pressure-swirl-gas atomizer
- Processing and mechanical behaviour of a dual scale particle strengthened copper composite
- Electrochemical characterisation of magnesium and wrought magnesium alloys
- History
- Progress in understanding the metallurgy of 18% nickel maraging steels
- Notifications
- Quality Management Basics on a High Level
- Personal
- News
Articles in the same Issue
- Frontmatter
- Editorial
- Diffusion of 65Zn in the Mg17Al12 intermetallic compound and in the Mg-33.4 wt.% Al eutectic
- Thermodynamic modeling of the sodium alanates and the Na–Al–H system
- Thermodynamic assessment of the systems La2O3–Al2O3 and La2O3–Y2O3
- Re-evaluation of phase equilibria in the Al–Mo system
- EBSD and EDX analysis at the cladding–substrate interface of a laser clad railway wheel
- Thermodynamic properties of liquid silver–indium–antimony alloys determined from e.m.f. measurements
- Density and excess volumes of liquid copper, cobalt, iron and their binary and ternary alloys
- Thermodynamic investigation of Co–Cr alloys, III: Thermo-analytical measurements using DSC and DTA techniques
- Effect of a low frequency electromagnetic field on the direct-chill (DC) casting of AZ80 magnesium alloy ingots
- Microstructure of the “white layer” formed on nitrided Fe-7 wt.% Cr alloys
- The effect of ageing on tensile behaviour, mode I and mixed mode I/III fracture toughness of 7010 aluminium alloy
- Plane bending fatigue behavior of interstitial-free steel at room temperature
- Fracture behaviour of ultrafine-grained materials under static and cyclic loading
- Influence of process parameters on particle characteristics using a combined pressure-swirl-gas atomizer
- Processing and mechanical behaviour of a dual scale particle strengthened copper composite
- Electrochemical characterisation of magnesium and wrought magnesium alloys
- Progress in understanding the metallurgy of 18% nickel maraging steels
- Quality Management Basics on a High Level
- Personal
- News
- Frontmatter
- Editorial
- Editorial
- Basic
- Diffusion of 65Zn in the Mg17Al12 intermetallic compound and in the Mg-33.4 wt.% Al eutectic
- Thermodynamic modeling of the sodium alanates and the Na–Al–H system
- Thermodynamic assessment of the systems La2O3–Al2O3 and La2O3–Y2O3
- Re-evaluation of phase equilibria in the Al–Mo system
- EBSD and EDX analysis at the cladding–substrate interface of a laser clad railway wheel
- Thermodynamic properties of liquid silver–indium–antimony alloys determined from e.m.f. measurements
- Density and excess volumes of liquid copper, cobalt, iron and their binary and ternary alloys
- Thermodynamic investigation of Co–Cr alloys, III: Thermo-analytical measurements using DSC and DTA techniques
- Applied
- Effect of a low frequency electromagnetic field on the direct-chill (DC) casting of AZ80 magnesium alloy ingots
- Microstructure of the “white layer” formed on nitrided Fe-7 wt.% Cr alloys
- The effect of ageing on tensile behaviour, mode I and mixed mode I/III fracture toughness of 7010 aluminium alloy
- Plane bending fatigue behavior of interstitial-free steel at room temperature
- Fracture behaviour of ultrafine-grained materials under static and cyclic loading
- Influence of process parameters on particle characteristics using a combined pressure-swirl-gas atomizer
- Processing and mechanical behaviour of a dual scale particle strengthened copper composite
- Electrochemical characterisation of magnesium and wrought magnesium alloys
- History
- Progress in understanding the metallurgy of 18% nickel maraging steels
- Notifications
- Quality Management Basics on a High Level
- Personal
- News