Creep and fracture behavior of peak-aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct)

D. D. Yin, Q. D. Wang, C. J. Boehlert, V. Janik

    Research output: Contribution to journalArticle

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    Abstract

    The tensile-creep and creep-fracture behavior of peak-aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct) (WGZ1152) was investigated at temperatures between 523 K (250 C) to 598 K (325 C) (0.58 to 0.66Tm) and stresses between 30 MPa to 140 MPa. The minimum creep rate of the alloy was almost two orders of magnitude lower than that forWE54-T6 and was similar to that for HZ32-T5. The creep behavior exhibited an extended tertiary creep stage, which was believed to be associated with precipitate coarsening. The creep stress exponent value was 4.5, suggesting that dislocation creep was the rate-controlling mechanism during secondary creep. At T = 573 K (300 C), basal slip was the dominant deformation mode. The activation energy for creep (Qavg = 221 ± 20 kJ/mol) was higher than that for self-diffusion in magnesium and was believed to be associated with the presence of second-phase particles as well as the activation of nonbasal slip and cross slip. This finding was consistent with the slip-trace analysis and surface deformation observations, which revealed that the nonbasal slip was active. The minimum creep rate and time-to-fracture followed the original and modified Monkman-Grant relationships. The microcracks and cavities nucleated preferentially at grain boundaries and at the interface between the matrix phase and the second phase. In-situ creep experiments highlighted the intergranular cracking evolution.

    Original languageEnglish (US)
    Pages (from-to)3338-3350
    Number of pages13
    JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
    Volume43
    Issue number9
    DOIs
    StatePublished - Sep 2012

    Profile

    slip
    Creep
    Cimetidine
    tensile creep
    microcracks
    magnesium
    precipitates
    grain boundaries
    exponents
    activation
    activation energy
    cavities
    matrices
    temperature
    Carbamyl Phosphate
    Addison Disease
    Enzyme Reactivators
    Edema Disease of Swine
    Common Bile Duct Diseases
    Acetanilides

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Metals and Alloys
    • Mechanics of Materials

    Cite this

    Creep and fracture behavior of peak-aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct). / Yin, D. D.; Wang, Q. D.; Boehlert, C. J.; Janik, V.

    In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 43, No. 9, 09.2012, p. 3338-3350.

    Research output: Contribution to journalArticle

    Yin, D. D.; Wang, Q. D.; Boehlert, C. J.; Janik, V. / Creep and fracture behavior of peak-aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct).

    In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 43, No. 9, 09.2012, p. 3338-3350.

    Research output: Contribution to journalArticle

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