Tusit Weerasooriya, Paul Moy, Robert J Dowding Tungsten and refractory metals-1994, 401-409, 1995... more Tusit Weerasooriya, Paul Moy, Robert J Dowding Tungsten and refractory metals-1994, 401-409, 1995. ... In contrast, there are dimple type ductile matrix fracture zones in the low contiguity material in addition to the cleaved W grain, brittle WW interface separation, and smooth ...
Materials and Manufacturing Processes, Aug 17, 2006
ABSTRACT Boron carbide (B4C) powder has been densified by a novel method of powder consolidation ... more ABSTRACT Boron carbide (B4C) powder has been densified by a novel method of powder consolidation known as Plasma Pressure Compaction (P2C). The P2C technique allows for rapid consolidation of powder by Joule heating of the powder bed. Powder is placed in graphite dies, and uniaxial pressure and low-voltage, high-amperage (10 V, 5000 amps maximum) direct current are applied to achieve densification. Pure B4C powder was consolidated at lower temperature and hold time to densities equal to those achieved by conventional hot pressing. With the addition of a small amount of alumina (Al2O3) as a sintering aid, densities as high as 97% theoretical were attained.
The structural/mechanical behavior of zirconium-based (Vitreloy106) bulk metallic glass reinforce... more The structural/mechanical behavior of zirconium-based (Vitreloy106) bulk metallic glass reinforced with tungsten particles is evaluated using elastic and plastic property measurements via static and dynamic compression tests performed on rod shaped samples. Anvil-on-rod impact tests combined with high-speed digital photography and velocity interferometry are used to obtain qualitative and quantitative information about the transient deformation and failure response of the
Tusit Weerasooriya, Paul Moy, Robert J Dowding Tungsten and refractory metals-1994, 401-409, 1995... more Tusit Weerasooriya, Paul Moy, Robert J Dowding Tungsten and refractory metals-1994, 401-409, 1995. ... In contrast, there are dimple type ductile matrix fracture zones in the low contiguity material in addition to the cleaved W grain, brittle WW interface separation, and smooth ...
Materials and Manufacturing Processes, Aug 17, 2006
ABSTRACT Boron carbide (B4C) powder has been densified by a novel method of powder consolidation ... more ABSTRACT Boron carbide (B4C) powder has been densified by a novel method of powder consolidation known as Plasma Pressure Compaction (P2C). The P2C technique allows for rapid consolidation of powder by Joule heating of the powder bed. Powder is placed in graphite dies, and uniaxial pressure and low-voltage, high-amperage (10 V, 5000 amps maximum) direct current are applied to achieve densification. Pure B4C powder was consolidated at lower temperature and hold time to densities equal to those achieved by conventional hot pressing. With the addition of a small amount of alumina (Al2O3) as a sintering aid, densities as high as 97% theoretical were attained.
The structural/mechanical behavior of zirconium-based (Vitreloy106) bulk metallic glass reinforce... more The structural/mechanical behavior of zirconium-based (Vitreloy106) bulk metallic glass reinforced with tungsten particles is evaluated using elastic and plastic property measurements via static and dynamic compression tests performed on rod shaped samples. Anvil-on-rod impact tests combined with high-speed digital photography and velocity interferometry are used to obtain qualitative and quantitative information about the transient deformation and failure response of the
Uploads
Papers by Robert Dowding