Creep and fracture behavior of as-cast Mg-11Y-5Gd-2Zn-0.5Zr (wt%)

D. D. Yin, Q. D. Wang, C. J. Boehlert, W. J. Ding

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    Abstract

    The tensile-creep and creep-fracture behavior of as-cast Mg-11Y-5Gd-2Zn-0.5Zr (wt%) (WGZ1152) was investigated at temperatures between 523 and 598 K (0.58-0.66T m) and stresses between 30 and 140 MPa. The creep stress exponent was close to five, suggesting that dislocation creep was the dominant creep mechanism. The activation energy for creep (233 ± 18 kJ/mol) was higher than that for self-diffusion in magnesium, and was believed to be associated with cross-slip, which was the dominant thermally-aided creep mechanism. This was consistent with the surface observations, which suggested non-basal slip and cross-slip were active at 573 K. The minimum creep rate and fracture time values fit the original and modified Monkman-Grant models. In situ creep experiments highlighted the intergranular cracking evolution. The creep properties and behavior were compared with those for other high-temperature creep-resistant Mg alloys such as WE54-T6 and HZ32-T5.

    Original languageEnglish (US)
    Pages (from-to)6263-6275
    Number of pages13
    JournalJournal of Materials Science
    Volume47
    Issue number17
    DOIs
    StatePublished - Sep 2012

    Profile

    Creep
    Cimetidine
    Acetanilides
    Addison Disease
    Temperature
    Edema Disease of Swine
    Common Bile Duct Diseases
    Feline Sarcoma Viruses
    African Swine Fever
    Anthralin
    Magnesium
    Activation energy
    Experiments

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

    Cite this

    Creep and fracture behavior of as-cast Mg-11Y-5Gd-2Zn-0.5Zr (wt%). / Yin, D. D.; Wang, Q. D.; Boehlert, C. J.; Ding, W. J.

    In: Journal of Materials Science, Vol. 47, No. 17, 09.2012, p. 6263-6275.

    Research output: Contribution to journalArticle

    Yin, D. D.; Wang, Q. D.; Boehlert, C. J.; Ding, W. J. / Creep and fracture behavior of as-cast Mg-11Y-5Gd-2Zn-0.5Zr (wt%).

    In: Journal of Materials Science, Vol. 47, No. 17, 09.2012, p. 6263-6275.

    Research output: Contribution to journalArticle

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    abstract = "The tensile-creep and creep-fracture behavior of as-cast Mg-11Y-5Gd-2Zn-0.5Zr (wt%) (WGZ1152) was investigated at temperatures between 523 and 598 K (0.58-0.66T m) and stresses between 30 and 140 MPa. The creep stress exponent was close to five, suggesting that dislocation creep was the dominant creep mechanism. The activation energy for creep (233 ± 18 kJ/mol) was higher than that for self-diffusion in magnesium, and was believed to be associated with cross-slip, which was the dominant thermally-aided creep mechanism. This was consistent with the surface observations, which suggested non-basal slip and cross-slip were active at 573 K. The minimum creep rate and fracture time values fit the original and modified Monkman-Grant models. In situ creep experiments highlighted the intergranular cracking evolution. The creep properties and behavior were compared with those for other high-temperature creep-resistant Mg alloys such as WE54-T6 and HZ32-T5.",
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    AU - Boehlert,C. J.

    AU - Ding,W. J.

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