タングステン系焼結合金の機械的性質

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  • Mechanical properties of sintered tungsten base composites.
  • タングステンケイ ショウケツ ゴウキン ノ キカイテキ セイシツ

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This report describes the density, strength, toughness and ductility variations of Tungsten Base Composites.<BR>Composites of tungsten with additional nickel and iron (91.3-95.5%W/5.8-3.0%Ni/2.9-1.5%Fe) were fabricated by liquid phase sintering of well-grained powder (-2 μm) at 1460-1500°C in a hydrogen atmosphere.<BR>The microstructure of liquid sintered Tungsten Base Composites consists of rounded and single crystal tungsten grains in a binder.<BR>In order to investigate the deformation and fracture behavior of sintered Tungsten Base Composites, metallographic and fractographic examinations were performed in terms of tension test, K1c test and Charpy impact test.<BR>Mechanical properties of the Tungsten Base Composites are as follows:<BR>(1) The tensile strength, hardness and toughness are increased with the increase of W content and swaging rates. On the contrary, the elongation is decreased with increasing W content and swaging rates.<BR>(2) The mechanical properties of the heavy alloys are governed by the binding energy between the tungsten-matrix phases. The weaker this binding energy is, the lower the ductility to failure. In heavy alloys the maximum elongation depends strongly upon its contiguity.

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