Materials pp 19-28 | Cite as

Deformation and Fracture of Al-Li Alloys in Mechanical-Impact Tests

  • R. P. Reed
  • C. N. McCowan
  • N. J. Simon
  • J. D. McColskey
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 38)

Abstract

Mechanical-impact tests in liquid and gaseous oxygen atmospheres aid in the assessment of Al-Li alloys for their use in cryogenic tankage for Advanced Launch Systems. In these tests, a falling plummet-striker pin assembly impacts a small disc specimen. Compressive, radial shear, and tensile (hoop) stresses are imparted to the disc specimens. The combination of these stresses and the high strain rate results in unique deformation and fracture characteristics. These characteristics include adiabatic shear bands, micro-cracking, specimen splitting, specimen heating (local melting), radial deformation in preferred orientations, and shear lips at the specimen-striker pin interface. These deformation and fracture modes are described and compared for various tempers of Al-Li alloys 8090, 2090, 2095, and alloy 2219. Distinctions between the Al-Li alloys and alloy 2219 are discussed.

Keywords

Shear Band Intergranular Crack Adiabatic Shear Band Local Melting Radial Shear 
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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References

  1. 1.
    R. P. Reed, N. J. Simon, J. D. McColskey, J. R. Berger, C. N. McCowan, J. W. Bransford, E. S. Drexler, and R. P. Walsh, “Aluminum Alloys for Cryogenic Tanks: Oxygen Compatibility Vol. 1,” AL-TR-90–063, Astronautics Lab (AFSC), Edwards AFB, California (September, 1990 ).Google Scholar
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    R. P. Reed, N. J. Simon, J. D. McColskey, J. R. Berger, C. N. McCowan, J. W. Bransford, E. S. Drexler, and R. P. Walsh, “Aluminum Alloys for Cryogenic Tanks: Oxygen Compatibility Final Report: Vol. 2,” Al-TR-90–063, Astronautics Lab (AFSC), Edwards AFB, California (September, 1990 ).Google Scholar
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    R. P. Reed, P. T. Purtscher, N. J. Simon, J. D. McColskey, R. P. Walsh, J. R. Berger, E. S. Drexler, and R. Santoyo, National Institute of Standards and Technology, Boulder, Colorado (1991), to be published as an Edwards AFB report.Google Scholar
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    N. J. Simon, E. S. Drexler, and R. P. Reed, “Review of Mechanical and Physical Properties of Al-Li Alloys and Alloy 2219, ” Al-TR-90–064, Astronautics Lab (AFSC), Edwards AFB, California (September, 1990 ).Google Scholar

Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • R. P. Reed
    • 1
  • C. N. McCowan
    • 1
  • N. J. Simon
    • 1
  • J. D. McColskey
    • 1
  1. 1.Materials Reliability DivisionNational Institute of Standards and TechnologyBoulderUSA

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