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Correlation of microstructure with dynamic deformation behavior and penetration performance of tungsten heavy alloys fabricated by mechanical alloying

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Abstract

In this study, tungsten heavy alloy specimens were fabricated by mechanical alloying (MA), and their dynamic torsional properties and penetration performance were investigated. Dynamic torsional tests were conducted on the specimens fabricated with different sintering temperatures after MA, and then the test data were compared with those of a conventionally processed specimen. Refinement of tungsten particles was obtained after MA, but contiguity was seriously increased, thereby leading to low ductility and impact energy. Specimens in which both particle size and contiguity were simultaneously reduced by MA and two-step sintering and those having higher matrix fraction by partial MA were successfully fabricated. The dynamic test results indicated that the formation of adiabatic shear bands was expected because of the plastic localization at the central area of the gage section. Upon highspeed impact testing of these specimens, self-sharpening was promoted by the adiabatic shear band formation, but their penetration performance did not improve since much of kinetic energy of the penetrators was consumed for the microcrack formation due to interfacial debonding and cleavage fracture of tungsten particles. In order to improve penetration performance as well as to achieve selfsharpening by applying MA, conditions of MA and sintering process should be established so that alloy densification, particle refinement, and contiguity reduction can be simultaneously achieved.

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Author notes

  1. Dong-Kuk Kim (Research Assistant, Postdoctoral Research Associate)

    Present address: Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784, Pohang, Korea

  2. Ho Jin Ryu (Research Assistant, Postdoctoral Research Associate)

    Present address: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 305-701, Taejon, Korea

Authors and Affiliations

  1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784, Pohang, Korea

    Sunghak Lee (Professor)

  2. the Division of Engineering, Brown University, 02912, Providence, RI

    Dong-Kuk Kim (Research Assistant, Postdoctoral Research Associate)

  3. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 305-701, Taejon, Korea

    Soon Hyunghong (Professor)

  4. Advanced Research Reactor Fuel Development Team, Korea Atomic Energy Research Institute, 305-1353, Taejon, Korea

    Ho Jin Ryu (Research Assistant, Postdoctoral Research Associate)

  5. the Agency for Defence Development, 300-600, Taejon, Korea

    Joon-Woong Noh (Senior Research Scientist)

Authors
  1. Dong-Kuk Kim
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  2. Sunghak Lee
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  5. Joon-Woong Noh
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Kim, DK., Lee, S., Ryu, H.J. et al. Correlation of microstructure with dynamic deformation behavior and penetration performance of tungsten heavy alloys fabricated by mechanical alloying. Metall Mater Trans A 31, 2475–2489 (2000). https://doi.org/10.1007/s11661-000-0193-0

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  • DOI: https://doi.org/10.1007/s11661-000-0193-0

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