Dy-Cu二元系合金相图

Dy-Cu二元系合金相图已采用X射线衍射和差热分析方法测出。此系统中存在两个共晶反应,共晶点成份分别为12wt%Cu和83Wt%Cu,对应的共晶温度为808℃和880℃。在室温下存在三个稳定的金属间化合物:DyCu,DyCu₂和DyCu₅,DyCu和DyCu₂分别在840℃和885℃由包晶反应生成,而DyCu₅在970℃液固同成份熔化。在890℃由包晶反应形成的金属间化合物DyCu₇在缓冷至848关键词：

A PHASE DIAGRAM OF THE ALLOYS OF THE DYSPROSIUM-COPPER BINARY SYSTEM

A phasediagram of the alloys of the dysprosium-copper binary system has been determined by means of X-ray diffraction and differential thermal analysis techniques. Its constitutional diagram has been constructed. Two eutectic reactions occur at 12 and 83 wt%Cu approximately, and with characteristic temperatures of 808 and 88°C, respectively. At room temperature three stable intermetallic compounds have been found, namely DyCu, DyCu₂ and DyCu₅. The DyCu and DyCu₂ are formed by peritectic reactions at 840 and 885°C respectively, and DyCu₅ melt congruently at 97°C. However, another intermetallic compound DyCur forms at 89°C periteetically and decomposes eutectoidally at 848°C as it is cooling slowly. The solid solubility of Dy in Cu is undetectable, and the solid solubility of Cu in Dy is less than 0.2 wt%Cu at room temperature.