STP1111

    Temperature Increases in Aluminum Alloys During Mechanical-Impact Tests for Oxygen Compatibility

    Published: Jan 1991


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    Abstract

    In mechanical-impact testing of Al-Li alloys and Al alloy 2219 for oxygen compatibility, specimens absorb a significant amount of energy in a short time. The absorbed energy is sufficient to crack and, in many cases, produce large fractures (splits) in the specimens. The high strain rate from impact results in the formation of adiabatic shear bands under adiabatic conditions in the deformed areas. Large local temperature increases in the specimens occur during deformation, leading to localized melting.

    Estimates of temperature increases assuming macroscopic homogeneous deformation during impact are presented. Characteristic times to propagate a thermal transient and to complete the mechanical deformation process are estimated. The difference between the alloy systems in this characteristic time to propagate a thermal disturbance offers a possible explanation of the differences in sizes and frequencies of reactions observed in Al alloy 2219, compared to the Al-Li alloys.

    Keywords:

    oxygen compatibility, mechanical impact test, oxygen reaction, Al-Li alloys, 8090, 2090, WL049, Al alloy, 2219


    Author Information:

    Simon, NJ
    physicistconsultant, National Institute of Standards and TechnologyNational Institute of Standards and Technology, Boulder, CO

    Reed, RP
    physicistconsultant, National Institute of Standards and TechnologyNational Institute of Standards and Technology, Boulder, CO


    Paper ID: STP17775S

    Committee/Subcommittee: G04.01

    DOI: 10.1520/STP17775S


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