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ISOtHERMAL SECtION OF Mg-Zn-La SYStEM IN Mg RICH CORNER At 350℃

Acta Metallurgica Sinica(English Letters) 2008年第5期21卷 329-335页

作者： M.L. Huang H.X. Li H. Ding Y.P. Ren S.M. Hao School of Materials and Metallurgy Northeastern University Shenyang 110004 China

Alloys of Mg-Zn-La system in Mg rich corner at 350℃ have been prepared in this study. Scanning electron microscopy （SEM）, electron probe microanalysis with energy dispersive X-ray spectroscopy （EPMA-EDS）, and X-ray diffraction （XRD） have been used to identify the phase equilibrium and the composition of each phase in the alloys. As a result, the isothermal section of Mg-Zn-La system in Mg rich corner at 350℃ has been determined. the result shows that, in addition to some binary phases, there exists a linear ternary compound called t-phase in Mg-Zn-La system at 350℃, in which the La content is about 8 at. pct ±0.4 at. pct and the Zn content is 8 at. pct- 48 at. pct. the t-phase has a C-centered orthorhombic crystal structure, and the lattice parameters are a=0.965-1.020 nm, b=1.121 1.142 nm, c=0.950-0.977 nm.

关键词： Mg-Zn-La system phase equilibrium t-phase Isothermal section

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phase Equilibrium of Mg-Zn-La System in Mg-Rich Corner from 200 to 350 ℃

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Journal of Rare Earths 2007年第S1期25卷 519-522页

作者：黄明丽李洪晓丁桦任玉平郝士明 School of Materials and Metallurgy Northeastern University

Alloys of Mg-Zn-La system in Mg rich corner were prepared, and the phase relationship was investigated at different temperatures such as 200, 300 and 350 ℃ by scanning electron microscopy(SEM), X-ray diffraction(XRD) and electron probe microanalysis with energy dispersive X-ray spectroscopy (EPMA). two types of phase equilibrium were identified at the different temperatures. One is two-phase equilibrium contained the Mg solid solution and t-phase. the other is three-phase equilibrium which contained the Mg solid solution, MgZn phase and t-phase. t-phase was stable as the temperature changed. the La content in t-phase is constant which is about 8±0.3% (atom fraction); but the Mg content and Zn content of that is changed, and the Zn content in t-phase was from 16.1% to 44%. the solubility of La in MgZn phase was increased from 1.2% to 1.6% as the temperature increasing from 200 to 350 ℃.

关键词： Mg-Zn-La system phase equilibrium t-phase phase diagram rare earths

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phase Equilibrium of Mg-Zn-La System in Mg-Rich Corner from 200 to 350 ℃

Phase Equilibrium of Mg-Zn-La System in Mg-Rich Corner from ...

引用

the Fifth International Conference on Rare Earth Development and Application

作者：黄明丽李洪晓丁桦任玉平郝士明 School of Materials and Metallurgy Northeastern University

＜正＞Alloys of Mg-Zn-La system in Mg rich corner were prepared,and the phase relationship was investigated at dif- ferent temperatures such as 200,300 and 350℃ by scanning electron microscopy（SEM）,X-ray diffraction（XRD）and electron probe microanalysis with energy dispersive X-ray spectroscopy（EPMA）.two types of phase equilibrium were identified at the different *** is two-phase equilibrium contained the Mg solid solution and *** other is three-phase equilibrium which contained the Mg solid solution,MgZn phase and t-phase.t-phase was stable as the temperature *** La content in t-phase is constant which is about 8±0.3%（atom fraction）;but the Mg content and Zn content of that is changed,and the Zn content in t-phase was from 16.1% to 44%.the solubility of La in MgZn phase was increased from 1.2% to 1.6% as the temperature increasing from 200 to 350℃.

关键词： Mg-Zn-La system phase equilibrium t-phase phase diagram rare earths

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