Creep Parameters in a Die-Cast Mg-Al-Ca Alloy

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Abstract

Tensile creep tests were conducted to determine the creep parameters for a die-cast Mg-Al-Ca alloy AX52 (X representing calcium) in a temperature range from 423 to 498 K. The stress exponent of the minimum creep rate, <I>n</I>, increases at the yield stress of the alloy, and it lowers at higher temperatures. The activation energy for creep, <I>Q<SUB>c</SUB></I>, decreases with increasing applied stress typically below the yield stress. The change in the creep parameters, <I>n</I> and <I>Q<SUB>c</SUB></I>, is associated with the decreased creep strength caused by the collapse of the eutectic intermetallic phase covering the primary α-Mg grains during creep. The thermally activated component of <I>Q<SUB>c</SUB></I> is evaluated to be 143 kJ/mol below the yield stress, which is very close to the activation energy for the lattice self-diffusion of magnesium. It is deduced that the creep for the alloy is controlled by the high-temperature climb of dislocations.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 48(9), 2329-2335, 2007-09-01

    The Japan Institute of Metals and Materials

References:  56

Cited by:  3

Codes

  • NII Article ID (NAID)
    10019853257
  • NII NACSIS-CAT ID (NCID)
    AA1151294X
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    13459678
  • NDL Article ID
    8884785
  • NDL Source Classification
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL Call No.
    Z53-J286
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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