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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Isothermal section of Mg-Zn-La system in Mg-rich corner at 400 ℃
HUANG Ming-li(黄明丽)1, LI Hong-xiao(李洪晓)1, REN Yu-ping(任玉平)1,
DING Hua(丁  桦)1, HAO Shi-ming(郝士明)1, CHEN Hui(陈  辉)<

1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;
2. Traffic and Mechanical School, Shenyang Jianzhu University, China

Abstract:Alloys with different compositions in Mg-rich corner of Mg-Zn-La system at 400 ℃ were prepared, the phase equilibrium in the Mg-rich corner of Mg-Zn-La system was determined by scanning electron microscopy(SEM), electron probe microanalysis based on energy dispersive X-ray spectroscopy (EPMA-EDS) and X-ray diffraction(XRD), and the isothermal section at 400 ℃ was established. The results show that there exists a ternary compound (T-phase) with a constant La content and changable Mg/Zn contents in the Mg-Zn-La system. The mole fraction of La in T-phase is about 8%, and that of Zn is from 16% to 43%. There exist a two-phase equilibrium which consists of T-phase plus hcp-Mg and a three-phase equilibrium which is composed of T-phase, hcp-Mg and a liquid phase (L-phase) at 400 ℃. The L-phase consists of 70% Mg, 30% Zn and is free of La.

 

Key words: Mg-Zn-La system; isothermal section; T-phase; phase equilibrium
shase; phase equilibrium

ISSN 1672-7029
CN 43-1423/U

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