| A study has been made of sintering and mechanical behaviors of heavy alloys whose compositions were (a)94%W-3%Ni-3%Fe, (b)94%W-2.5%Fe-1%Co, (c)94%W-2.5%Ni-2.5%Fe-1%Mo, and (d)94%W-2.5%Ni-2.5%Fe-1%Mn. Liquid phase sintering was performed in hydrogen atmosphere at 1196℃ for 15 to 1200 minutes, Coarsening of tungsten grains during sintering obeyed the diffusion controlled growth mechanism. The growth rate decreased in the order of specimens (b), (c), (a) and (d). The hardness decreased with increasing sintering time due to increase in mean free path of binder phases, following the Hall-Petch type relation. The hardness decreased in the order of specimens (b),(a),(c) and (d) at a given mean free path of binder phases due to difference in hardness of binder phases. |
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