Creep kinetics in compression of sand cast commercial Zn-Al alloys

M. Anwar*, S. Murphy

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review


    The compressive creep behaviour of sand cast ZA8, ZA12, and ZA27 alloys was investigated. Primary creep contraction increased with aluminium content and stress and, with the exception of ZA27, decreased with temperature. Secondary creep rates for ZA8 and ZA27 were similar and 33% less than for ZA12. Creep kinetics obeyed an empirical equation ln t = C′- n ln(σ) + Q/RT where t is the time to a selected strain, σ is the nominal stress, T is the absolute temperature, R is the gas constant, and C′, n, and Q are material constants for each alloy. For total deformations up to 1%, the overall creep resistance increased in the order ZA27 > ZA12 > ZA8. In terms of secondary creep rate, the compressive creep resistance of ZA12 was similar to its tensile creep resistance as reported in the literature, but for ZA27 the creep rate in compression was generally slightly higher.

    Original languageEnglish
    Pages (from-to)321-327
    Number of pages7
    JournalMaterials Science and Technology
    Issue number3
    Publication statusPublished - 2000


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