Partial phase diagram of Au-Ag-Dy ternary system

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.