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Weldalite (trademark) 049 (Al 2095-T8): Anisotropy Effects at Cryogenic Conditions

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Interim rept. Aug 91-Jun 93,

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Tensile, fracture, and FCGR testing was performed on a plate of the aluminum-lithium alloy WeldaliteTM 049 Al 2095-T8 over a temperature range from ambient to liquid helium 4K conditions. Properties were developed on specimens removed from various orientations within a 12.7 mm 12 in nominal thick plate to characterize anisotropy with respect to strength and toughness. Strength and FCGR properties are compared to the conventional aluminum alloy 2219-T87, developed for similar cryogenic applications. Results indicate a high degree of anisotropy with respect to strength and ductility, with the lowest strengthhighest ductility occurring at 45-60 deg from the rolling direction. Decreases in test temperature led to higher strengths and similar anisotropic behavior, with little or no change in ductility. Fracture toughness measurements did not reveal any significant orientation effects, with toughness levels insensitive to the cryogenic temperatures examined. It was not possible to develop valid FCGR data on CT samples oriented in either the T-L or T-L plate directions due to out-of-plane cracking. Constant amplitude FCGR data generated on 45 deg oriented samples are comparable with reference data on similar Weldalite material for the T-L and L-T directions, though a slight degree of anisotropy appears to exist at lower values of Delta K. FCGR data obtained at liquid nitrogen and liquid helium test conditions were identical and only slightly lower than similar data developed under ambient conditions. WeldaliteTM 049, Fracture toughness, Cryogenic, Aluminum-lithium, Tensile, 2219, 2095, Fatigue crack growth

Subject Categories:

  • Properties of Metals and Alloys
  • Crystallography
  • Mechanics
  • Thermodynamics

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