Impact and dynamic deformation behaviour of mechanically alloyed tungsten-based composites

The tensile properties, impact energy and dynamic deformation behavior were investigated to examine the effects of microstructural factors on the mechanical properties of mechanically alloyed tungsten-based composites. The 93W-5.6Ni-1.4Fe composites were fabricated by mechanical alloying process using elemental powders of tungsten, nickel and iron, followed by sintering at temperature ranged from 1445 to 1485°C under hydrogen atmosphere. Tungsten-based composite sintered using mechanically alloyed powders showed finer tungsten particles about 5-18 μm with high density above 99% at shorter sintering time than fabricated by conventional liquid phase sintering process. When solid state sintered at 1445°C, the microstructure showed that the solid solution matrix phase was isolated within interconnected tungsten particles. While, when liquid phase sintered above 1460°C, the microstructure showed that the spherical tungsten particles were distributed within continuous solid solution matrix phase. The elongation and impact energy were increased, maintaining similar tensile strength, with increasing matrix volume fraction and decreasing the W/W contiguity as the sintering temperature increased. The dynamic torsional behavior using Kolsky bar exhibited the brittle fracture in solid state sintered composite, while showed the shear fracture liquid phase sintered composite. © 1998 Trans Tech Publications.
Publisher
Trans Tech Publications
Issue Date
1998-01
Language
ENG
Citation

KEY ENGINEERING MATERIALS, v.0, no.143 , pp.453 - 462

ISSN
1013-9826
URI
http://hdl.handle.net/10203/3050
Appears in Collection
MS-Journal Papers(저널논문)
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