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Metallurgical and Materials Transactions A

, Volume 31, Issue 10, pp 2475–2489 | Cite as

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

  • Dong-Kuk Kim
  • Sunghak Lee
  • Ho Jin Ryu
  • Soon Hyunghong
  • Joon-Woong Noh
Article

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.

Keywords

Material Transaction Mechanical Alloy Scanning Electron Micro Adiabatic Shear Band Tungsten Particle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2000

Authors and Affiliations

  • Dong-Kuk Kim
    • 2
  • Sunghak Lee
    • 1
  • Ho Jin Ryu
    • 4
  • Soon Hyunghong
    • 3
  • Joon-Woong Noh
    • 5
  1. 1.Center for Advanced Aerospace MaterialsPohang University of Science and TechnologyPohangKorea
  2. 2.the Division of EngineeringBrown UniversityProvidence
  3. 3.Department of Materials Science and EngineeringKorea Advanced Institute of Science and TechnologyTaejonKorea
  4. 4.Advanced Research Reactor Fuel Development TeamKorea Atomic Energy Research InstituteTaejonKorea
  5. 5.the Agency for Defence DevelopmentTaejonKorea

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