Effects of powder pretreatment on the microstructure and mechanical properties of tungsten heavy alloys. (Reannouncement with new availability information)
Tungsten heavy alloys exhibit unique properties such as high strength, density, ductility and toughness. Alloying additions of molybdenum to the W-Ni-Fe system have drastically decreased the sintered grain size through the limited solubility of tungsten in the solid solution matrix in the presence of molybdenum. This contributes to additional strengthening but a decrease in the ductility. Recent work has shown that the distribution of molybdenum in the tungsten grains is not uniform after sintering. Homogenous coating of Mo on W is desirable to further decrease solution-reprecipitation during liquid phase sintering. In this work, alloying additions of molybdenum in the W-Ni-Fe system through various methods such as electroless-plating, milling, and mixing of elemental powders are investigated. The effects of these techniques on the final microstructure, densification and mechanical properties are examined using electron microscopy, microprobe analysis, and mechanical testing. The ideal distribution of molybdenum in the microstructure is investigated and the optimum alloying addition technique is singled out. This helps to better understand the processes occurring during liquid phase sintering of these alloys and further improve their mechanical properties.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Engineering Science and Mechanics
- OSTI ID:
- 166845
- Report Number(s):
- AD-A-249402/9/XAB; TRN: 53520299
- Resource Relation:
- Other Information: PBD: 1991
- Country of Publication:
- United States
- Language:
- English
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