Thermodynamic assessment and experimental study of Mg–Gd alloys
Thermodynamic assessment and experimental study of Mg–Gd alloys
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DOI：
10.1016/j.jallcom.2013.07.042
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发表时间：
2013-12
影响因子：
6.2
通讯作者：
M. Hampl;C. Blawert;M. R. S. Campos;N. Hort;Qiuming Peng;K. Kainer;R. Schmid-Fetzer
中科院分区：
文献类型：
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作者：
M. Hampl;C. Blawert;M. R. S. Campos;N. Hort;Qiuming Peng;K. Kainer;R. Schmid-Fetzer
对金属型激冷铸造试样在300-550 °C退火1-14天后进行显微组织、化学成分和能谱分析，研究了Gd在（Mg）中的固溶度。基于这些关键数据和所有严格评估的实验相平衡和Mg-Gd系统的热力学数据，两个Calphad型热力学描述。这提供了计算的相图，和蒸汽压数据和富镁相图之间的固有的不一致性被指示。以前的误解的“实验”生成焓数据的二元GdxMgy金属间化合物也被发现。对稀土元素系列R =（La，Ce，Pr，Nd，Sm，Gd）的这些关键热力学数据的系统趋势的假设进行了详细的分析。
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 °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 GdxMgyintermetallic 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.