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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 4    August 2005

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Partial phase diagram of Au-Ag-Dy ternary system
ZHANG Kang-hou(张康侯), CHEN Jiang(陈 江)

Kunming Institute of Precious Metals, Kunming 650221, China

Abstract: On the basis of Au-Ag, Au-Dy and Ag-Dy binary phase diagrams, the 700℃ isothermal section of Au-Ag-Dy ternary system(Dy≤35%, mole fraction) was established by X-ray diffraction analysis, differential thermal analysis and optical microscopy. It is found that there is a long single-phase region, Au(Ag) or Ag(Au), along the Au-Ag binary isomorphous system on the gold-silver-rich side of the 700℃ isothermal section and between the binary compound Au2Dy and Ag2Dy there is the all proportional solid solution, (Au2Dy) or (Ag2Dy). It is confirmed that the partial 700℃ isothermal section consists of six single-phase regions: solid solution Au(Ag) or Ag(Au), (Au2Dy) or (Ag2Dy), Au6Dy, Au51Dy14, Au3Dy and Ag51Dy14; nine binary-phase regions: (Au2Dy)+Au(Ag), Au6Dy+Au(Ag), Au(Ag)+Ag51Dy14, Ag51Dy14+(Au2Dy), Au3Dy+(Au2Dy), Au3Dy+Au51Dy14, Au51Dy14+Au6Dy, Au51Dy14+Au(Ag) and Au(Ag)+Au3Dy; four ternary regions: Ag51Dy14+(Au2Dy)+Au(Ag), (Au2Dy)+Au(Ag)+Au3Dy, Au(Ag)+Au3Dy+Au51Dy14 and Au51Dy14+Au(Ag)+Au6Dy. No new ternary compound is formed in the gold-silver-rich field(Dy≤35%) of the Au-Ag-Dy ternary system.

 

Key words: Au-Ag-Dy ternary system; phase diagram; isothermal section

ISSN 1672-7029
CN 43-1423/U

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