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THE LIQUIDUS OF THE TERNARY Ag-Cu-Si ALLOY SYSTEM

Z.G. Liu , X.M. Luo , G.S. Guo and C.X. He G.B. Li and Q. Y. Zhang(Institute of Precious Metals , Kunming 650221 , China)(Institute of Chemistry and Moleculars Engineering , Beliing University , Beijing 100871 , China)

金属学报(英文版)

The liquidus of the ternary Ag-Cd-Si alloy system in the Ag-Cu rich region was determined by DTA. The ternary Ag-Cd-Si system was divided into two ternary systems Ag-Cu-Cuo.76Si0.24 and Ag-Cu0.76Si0.24-Si by the section of Ag-Cu0.76 Si0.24.There is one ternary eutectic point for both the systems with the composition of 12. 5at. %Ag+71. 7at.%Cu+15.8at. %Si and 30at.% Ag+44.7at.%Cu+25.3at.%Sirespectivelg and the temperatures of the eutectic points are 740 and 705℃ respectively.

关键词: Ag-Cd-Si ternary sytem , null

METASTABLE PHASES IN RAPIDLY-SOLIDIFIED ALUMINIUMRICH Al-Sm ALLOYS

Y.T.Ning (Institute of Precious Metals , Kunming 650221 , China)

金属学报(英文版)

The splat foils of Al-Sm alloys with 0.04-0.06mm in thickness were made by hammeranvil technique. The estimated cooling rute was 106K/ order of magnitude. The extended solid solubility of Sm in α-Al reached 0.5at. % Sm. The intermediate phase in the rapidlysolidified Al-Sm alloys is Al11Sm3 phase, which is stable only at temperatures above 1339K in equilibrium state and retained to ambient temperature as a metastable phase, whereas the equlibrium intermediate phase, Al3Sm, was restricted to occur.

关键词: Al-Sm alloy , null , null

700℃ ISOTHERMAL SECTION OF THE Pd-Ru-Gd PARTIAL PHASE DIAGRAM

K.H Zhang and L.L. Chen (Institute of Precious Metals , Kunming 650221 , China)

金属学报(英文版)

The 700℃ isothermal section of the Pd-Ru-Gd partial ternary phase diagram containing more palladium than ruthenium was determined by X-rag diffraction analysis and optical microscopy. The section consists of seven single-phase regions,eleven two-phase regions and five three-phase regions. A new ternary compound Pd2RuGd2,which exhibits a tetragonal structure with a=0.7492 nm and c=0.7445 nm, has been found.

关键词: : palladium , null , null , null , null

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