HIGH TEMPERATURE CREEP OF Al-Mg ALLOYS.

Zenji Horita, T. G. Langdon

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    8 Citations (Scopus)

    Abstract

    Creep experiments were conducted on high purity Al and a range of Al-Mg solid solution alloys. For pure Al, creep occurs by a dislocation climb process and the stress exponent, n, is approximately 4. 4 over a wide range of stresses. For the solid solution alloys, there is a change from n approximately equals 4. 4 to n approximately equals 3. 0 with increasing stress due to the advent of viscous glide and the dragging of solute atom atmospheres. When the solute concentration is very small, as in Al-1% Mg, the stress exponent gradually increases from approximately 3. 0 with increasing stress, and ultimately there is a second dislocation climb region with n approximately equals 4. 4 and then power-law breakdown. The region of viscous glide with n approximately equals 3. 0 occurs over a wider range of stress at the higher solute concentrations, and this precludes the possibility of observing the second dislocation climb region in these alloys. The gradual increase in n above approximately 3. 0 in the viscous glide region is attributed to an increase in the value of m* above unity, where m* is the effective stress exponent for the dislocation velocity.

    Original languageEnglish
    Title of host publicationUnknown Host Publication Title
    PublisherPergamon Press (International Series on the Strength and Fracture of Materials and Structures)
    Pages797-802
    Number of pages6
    Volume1
    ISBN (Print)0080316409
    Publication statusPublished - 1986

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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