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Quantitative Investigation of Grain Growth in Carbide Added(Mo$_2$C, ZrC and WC) to TiC-Ni Matrix Cermets  

Kim, Soon-Ho (Dept. of Automotive Mechanical Engineering, Silla University)
Publication Information
International Journal of Precision Engineering and Manufacturing / v.5, no.1, 2004 , pp. 19-26 More about this Journal
Abstract
The growth of solid particles in TiC-XC-2vo1.% and TiC-XC-30vo1.% Ni alloys, (where X=Zr, W or Mo) was fitted to the equation of the form $d^3$-${do}^3$=Kt during the liquid phase sintering at 1,673K. Also, the grain growth behavior decreased markedly with the addition of ${MO}_2$C or WC and increased with the addition of zrC. The contiguity was greater in the alloys with a smaller growth rate constant and especially, decreased by increasing the Ni content in the TiC-${MO}_2$C-Ni alloy. In addition, the effect of the addition of carbide on the grain growth of 2 vo1.% Ni alloys was found to be similar to that of 30vo1.% Ni alloys. Consequently, the grain growth mechanism cannot be explained by the usual solution / reprecipitation process, but can be explained in terms of a new growth velocity equation, which includes the effects of contiguous carbide grain boundaries in restricting the overall grain growth, as well as the area of the solid / liquid interface in the alloy.
Keywords
The growth of solid particles; contiguity; grain growth mechanism; solid / liquid interfaces;
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