The tensile and creep behavior of Mg-Zn Alloys with and without y and Zr as ternary elements

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    Abstract

    Tensile-creep experiments were conducted in the temperature range 100-200°C and stress range 20-83 MPa for a series of magnesium-zinc-yttrium (Mg-Zn-Y) and mangnesium-zinc-zirconium (Mg-Zn-Zr) alloys ranging from 0 to 5.4 wt% Zn, 0 to 3 wt Y, and 0 to 0.6 wt.% Zr. The greatest tensile-creep resistance was exhibited by an Mg-4.1Zn-0.2Y alloy. The room-temperature yield strength increased with increasing Y content for Mg-1.6-2.0Zn alloys. The greatest tensile strength and elongation was exhibited by Mg-5.4Zn-0.6Zr. This alloy also exhibited the finest grain size and the poorest creep resistance. The measured creep exponents and activation energies suggested that the creep mechanisms were dependent on stress. For applied stresses greater than 40 MPa, the creep exponents were between 4 and 8. For applied stresses less than 40 MPa, the creep exponent was 2.2. The calculated activation energies (Qapp) were dependent on temperature where the Q app values between 100 and 150 °C (65 kJ/mol) were half those between 150 and 200 °C for the same applied stress value (30 MPa). Deformation observations indicated that the grain boundaries were susceptible to cracking in both tension and tension-creep, where at low applied stresses grain boundary sliding was suggested where strain accommodation occurred through grain boundary cracking. Thus grain size and grain boundaries appeared to be important microstructural parameters affecting the mechanical behavior. Microstructural effects on the tensile properties and creep behavior are discussed in comparison to other Mg-based alloy systems.

    LanguageEnglish (US)
    Pages3675-3684
    Number of pages10
    JournalJournal of Materials Science
    Volume42
    Issue number10
    DOIs
    StatePublished - May 2007

    Profile

    Creep
    grain boundaries
    tensile creep
    exponents
    Grain boundaries
    Temperature
    creep strength
    grain size
    activation energy
    temperature
    Creep resistance
    Activation energy
    zirconium alloys
    zinc alloys
    tensile properties
    accommodation
    yield strength
    yttrium
    tensile strength
    elongation

    ASJC Scopus subject areas

    • Materials Science(all)
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    The tensile and creep behavior of Mg-Zn Alloys with and without y and Zr as ternary elements. / Boehlert, C. J.

    In: Journal of Materials Science, Vol. 42, No. 10, 05.2007, p. 3675-3684.

    Research output: Research - peer-reviewArticle

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    abstract = "Tensile-creep experiments were conducted in the temperature range 100-200°C and stress range 20-83 MPa for a series of magnesium-zinc-yttrium (Mg-Zn-Y) and mangnesium-zinc-zirconium (Mg-Zn-Zr) alloys ranging from 0 to 5.4 wt% Zn, 0 to 3 wt Y, and 0 to 0.6 wt.% Zr. The greatest tensile-creep resistance was exhibited by an Mg-4.1Zn-0.2Y alloy. The room-temperature yield strength increased with increasing Y content for Mg-1.6-2.0Zn alloys. The greatest tensile strength and elongation was exhibited by Mg-5.4Zn-0.6Zr. This alloy also exhibited the finest grain size and the poorest creep resistance. The measured creep exponents and activation energies suggested that the creep mechanisms were dependent on stress. For applied stresses greater than 40 MPa, the creep exponents were between 4 and 8. For applied stresses less than 40 MPa, the creep exponent was 2.2. The calculated activation energies (Qapp) were dependent on temperature where the Q app values between 100 and 150 °C (65 kJ/mol) were half those between 150 and 200 °C for the same applied stress value (30 MPa). Deformation observations indicated that the grain boundaries were susceptible to cracking in both tension and tension-creep, where at low applied stresses grain boundary sliding was suggested where strain accommodation occurred through grain boundary cracking. Thus grain size and grain boundaries appeared to be important microstructural parameters affecting the mechanical behavior. Microstructural effects on the tensile properties and creep behavior are discussed in comparison to other Mg-based alloy systems.",
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