Volume 1, Issue 4 (July 1973)

    The Effect of Very Short Time-at-Temperature on the Yield Stress of 6061-T651 Aluminum

    CODEN: JTEOAD

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    Abstract

    This paper describes the experimental methods and the results of an investigation of the effect of short time-at-temperature (achieved by using high heating rates) on the yield stress of 6061-T651 aluminum in uniaxial tension. Specimens were heated to 260°C at rates from about 10−3 to 103°C/s and then immediately pulled to failure at a constant strain rate of about 10/s. These heating rates, which correspond to approximate times-at-temperature in the range of 10−1 to 105 s, produce a large change in yield stress between times-at-temperature of 102 to 105 s. This change is explained in terms of precipitate coarsening and is substantiated by metallographic evidence. Extrapolation to times-at-temperature in the order of 10−5 s is discussed, and it is suggested that at these rates changes in yield stress would be due to strain rate effects only.


    Author Information:

    Babcock, SG
    Manufacturing Development, General Motors Technical Center, Warren, Mich.

    Norvey, DB
    Manufacturing Development, General Motors Technical Center, Warren, Mich.

    Green, SJ
    Terra-Tek, Inc., Salt Lake City, Utah

    Holt, DL
    School of Engineering, University of Auckland, Auckland,


    Stock #: JTE10030J

    ISSN: 0090-3973

    DOI: 10.1520/JTE10030J

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    Author
    Title The Effect of Very Short Time-at-Temperature on the Yield Stress of 6061-T651 Aluminum
    Symposium , 0000-00-00
    Committee E28