Effects of atmosphere, temperature, and composition on the densification and properties of tungsten-nickel-manganese. (Reannouncement with new availability information)
Tungsten-nickel-manganese is a novel heavy alloy that holds promise for applications such as high energy penetrators. This new heavy alloy can be liquid phase sintered at temperatures 300 deg C lower than conventional heavy alloys. However, difficulties arise when sintering W-Ni-Mn alloys. A hydrogen atmosphere, usually used in the sintering of tungsten heavy alloys does not fully prevent the oxidation of manganese. The oxide results in pore retention that inhibits the full densification of this alloy. In this work, 90 wt% W with a 8/2, 6/4, 4/6, and 2/8 ratios of nickel to manganese compositions are studied. Among these systems, the 8/2 and 6/4 Ni to Mn compositions resulted in sintered densities higher than 98%. The residual oxide coupled with intermetallic formation during cooling results in a brittle alloy. However, quenching treatment results in a heavy alloy with mechanical properties comparable to the W-Ni-Fe system.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Engineering Science and Mechanics
- OSTI ID:
- 189801
- Report Number(s):
- AD-A--260373/6/XAB; CNN: Grant DAAL03-91-G-0309
- Country of Publication:
- United States
- Language:
- English
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