W-Ni-Fe系焼結合金の機械的性質に及ぼすCo添加の影響

概要

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This report describes the results of investigations on the improvement of characteristics of tungsten heavy alloys which were produced with addition of suitable amount of Co (with Ni/Fe ratio of about 2.0) to basic composition of W-Ni-Fe, and an optimum amount of Co addition obtained. The mechanical properties at room temperature of the (91.8-93.4 wt% W) alloys increased with increasing Co content and attained a maximum with Co content of about 1.5 wt%, while the 95.4 wt% W alloys attained a maximum with Co content of about 0.5 wt%.<BR>In the alloys with (addition of) suitable amount of Co, smaller dihedral angle between W-W grain and better "Wettability" were obtained, and it was made clear that those effect resulted in homogeneity of alloys, and the improved mechanical properties.<BR>The SEM photographs of the fracture surfaces show that Co content alloys strengthen mainly the interface between W-binder phase boundaries and W-W grain boundaries.