Comment to the paper “Re-evaluation of activities of magnesium and zinc components in the magnesium–zinc binary system from very low to high temperature”
-
Rainer Schmid-Fetzer
Abstract
In the paper “Re-evaluation of activities of magnesium and zinc components in the magnesium–zinc binary system from very low to high temperature” by Morishita et al. [1], which recently appeared as a Feature Article in this journal, the authors made the following three statements, commencing with the first sentence of the abstract:
The activities of zinc, aZn, and magnesium, aMg, from very low to high temperatures in the Mg–Zn binary system were evaluated for the first time from the relationship between the Gibbs energies of formation, ΔfG°T, of Mg48Zn52, Mg2Zn3, MgZn2 and Mg2Zn11 and their phase equilibria.”
It was found that the aZn and aMg values in the compounds steeply changed from the minimum to maximum as a function of the composition in a narrow solubility range.”
“…at very low temperatures, aZn and aMg were very small approaching to zero, …”; “The values of log aZn and log aMg in the two-phase regions were found to be decreased … and resulted in very small values”.
These three statements are disputed and commented below. For convenience, let us start with the second statement.
Refrences
[1]M.Morishita, H.Yamamoto, S.Shikada, M.Kusumoto, Y.Matsumoto: Int. J. Mat. Res. (formerly Z. Metallkd.), 102 (2011) 128.10.3139/146.110459Search in Google Scholar
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© 2012, Carl Hanser Verlag, Munich
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Articles in the same Issue
- Contents
- Contents
- Editorial
- A new editor for IJMR and other changes
- ECAA 2011
- Proceeding Papers
- A model for co-clusters and their strengthening in Al–Cu–Mg based alloys: a comparison with experimental data
- Effect of room temperature storage time on precipitation in Al–Mg–Si(–Cu) alloys with different Mg/Si ratios
- Influence of Mg/Si ratio on the clustering kinetics in Al–Mg–Si alloys
- Effect of simultaneous deformation and artificial ageing on the mechanical properties of an Al–Mg–Si alloy
- Ab-initio modeling of metastable precipitation processes in aluminum 7xxx alloys
- The kinetics of clustering in Al–Mg–Si alloys studied by Monte Carlo simulation
- Regular Articles
- A physically based approach to model the incomplete bainitic transformation in high-Si steels
- Impact of interannealing on recrystallization during final annealing in twin-belt cast Al–Fe–Si sheet
- Direct preparation of ferrite magnetic material from Jinchuan nickel sulfide concentrate by acid leaching
- Effect of La3+ on microwave dielectric properties of (Pb1−xCax)(Fe0.5Nb0.5)O3 (x = 0.5–0.6) ceramics
- Thermodynamic properties of liquid copper–antimony–tin alloys determined from e.m.f. measurements
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- Manufacturing process and electrochemical properties of an Mg–Ga–Hg anode sheet
- Effect of strain rate and dynamic strain ageing on work-hardening for aluminium alloy AA5182-O
- Steady-state creep analysis of a functionally graded thick cylinder subjected to internal pressure and thermal gradient
- Residual stress relaxation of hydroxyapatite/316L asymmetrical functionally gradient material fabricated by hot-pressing
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- Comment to the paper “Re-evaluation of activities of magnesium and zinc components in the magnesium–zinc binary system from very low to high temperature”
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