Influence of tungsten content, swaging, and grain size on the viscoplastic response of tungsten heavy alloys
The response of tungsten-nickel-iron (W-Ni-Fe) alloys to high rates of deformation has been investigated using compression and torsional Kolsky bars. The influence of tungsten content, swaging, and grain size on the dynamic behavior of commercially available alloys has been examined, The results indicate that the flow stresses sustained by these materials have a distinct dependence on strain rate, over a range from 10(exp {minus}4)/sec to 7 x 10(exp 3)/sec. The rate sensitivity itself appears to be influenced by tungsten content and degree of prior swaging, but appears to be almost independent of tungsten grain size. Metallographic analyses and microhardness measurements were performed to study the microstructural evolution with increasing strain at high rates. Adiabatic shear localization has been observed in high-rate shearing tests; relatively narrow shear bands are formed, followed immediately by catastrophic fracture.
- Research Organization:
- Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Mechanical Engineering
- OSTI ID:
- 147364
- Report Number(s):
- AD-A-296035/9/XAB; CNN: Contract DAAL03-91-G-0079; TRN: 53240084
- Resource Relation:
- Other Information: PBD: 1992
- Country of Publication:
- United States
- Language:
- English
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