Effects of Y and Ce on Microstructures and Properties of Nb-Si System Composites

【Author】

Qu Shiyu Han Yafang Song Jinxia Xiao Chengbo Song Liguo (Beijing institute of aeronautical materials, Beijing 100095, China)

【Abstract】

<正> The effects of yttrium and cerium on microstructures and properties of Nb-Si system composites were investigated by scanning electron microscopy(SEM), energy dispersive spectrum (EDS), X-ray diffraction(XRD) and high temperature oxidation experiments. It is found that the coarse primary silicide phase became finer and more homogeneous with Y and Ce addition. The results of high temperature oxidation experiments show that the oxidation rates of Nb Si system composites with an appropriate amount of Y and Ce decrease compared with those of alloys without Y or Ce addition, and oxidation products mainly distribute along the phase boundaries between the Nb solid solution and silicide.

【Keywords】

Nb-Si; microstructure; property; rare earths

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  • [1] Madan G. Mendiratta;;John J. Lewandowski;;Dennis M. Dimiduk, Strength and ductile-phase toughening in the two-phase Nb/Nb 5 Si 3 alloys, Metallurgical Transactions A,

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