Thermodynamic assessment and experimental study of Mg-Gd alloys

被引：48

作者：

Hampl, M. ^{[1
]}

Blawert, C. ^{[2
]}

Campos, M. R. Silva ^{[2
]}

Hort, N. ^{[2
]}

Peng, Q. ^{[2
]}

Kainer, K. U. ^{[2
]}

Schmid-Fetzer, R. ^{[1
]}

机构：

[1] Tech Univ Clausthal, Inst Met, D-38678 Clausthal Zellerfeld, Germany

[2] Helmholtz Zentrum Geesthacht, Inst Mat Res, Magnesium Innovat Ctr, D-21502 Geesthacht, Germany

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2013年 / 581卷

关键词：

Rare earth alloys and compounds; Microstructure; Phase diagrams; Thermodynamic modelling; RARE-EARTH; MAGNESIUM SYSTEM; BINARY-SYSTEMS; CE-MG; HEAT; LA; DY; ND;

D O I：

10.1016/j.jallcom.2013.07.042

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The solid solubility of Gd in (Mg) is studied experimentally using microstructure, chemical and EDX analysis on permanent mould chill cast samples which were annealed for 1-14 days at 300-550 degrees C. Based on those key data and all the critically assessed experimental phase equilibrium and thermodynamic data of the Mg-Gd system two Calphad-type thermodynamic descriptions are developed. This provides calculated phase diagrams, and an inherent inconsistency between the vapor pressure data and the Mg-rich phase diagram is indicated. A previous misperception of "experimental'' enthalpy of formation data of binary GdxMgy intermetallic compounds is also revealed. The assumption of systematic trends in these key thermodynamic data for the series of rare earth elements R = (La, Ce, Pr, Nd, Sm, Gd) is scrutinized. (C) 2013 Elsevier B. V. All rights reserved.

引用

页码：166 / 177

页数：12

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