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Metallurgical and Materials Transactions A

, Volume 41, Issue 8, pp 1973–1982 | Cite as

Effect of Ca and Rare Earth Elements on Impression Creep Properties of AZ91 Magnesium Alloy

  • B. Nami
  • H. Razavi
  • S. Mirdamadi
  • S.G. ShabestariEmail author
  • S.M. Miresmaeili
Article

Abstract

Creep properties of AZ91 magnesium alloy and AZRC91 (AZ91 + 1 wt pct RE + 1.2 wt pct Ca) alloy were investigated using the impression creep method. It was shown that the creep properties of AZ91 alloy are significantly improved by adding Ca and rare earth (RE) elements. The improvement in creep resistance is mainly attributed to the reduction in the amount and continuity of eutectic β(Mg17Al12) phase as well as the formation of new Al11RE3 and Al2Ca intermetallic compounds at interdendritic regions. It was found that the stress exponent of minimum creep rate, n, varies between 5.69 and 6 for AZ91 alloy and varies between 5.81 and 6.46 for AZRC91 alloy. Activation energies of 120.9 ± 8.9 kJ/mol and 100.6 ± 7.1 kJ/mol were obtained for AZ91 and AZRC91 alloys, respectively. It was shown that the lattice and pipe-diffusion-controlled dislocation climb are the dominant creep mechanisms for AZ91 and AZRC91 alloys, respectively. The constitutive equations, correlating the minimum creep rate with temperature and stress, were also developed for both alloys.

Keywords

Creep Rate Stress Exponent Creep Property AZ91 Alloy AZ91 Magnesium Alloy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2010

Authors and Affiliations

  • B. Nami
    • 1
    • 2
  • H. Razavi
    • 1
    • 2
  • S. Mirdamadi
    • 1
    • 2
  • S.G. Shabestari
    • 1
    • 2
    Email author
  • S.M. Miresmaeili
    • 3
  1. 1.Center of Excellence for Advanced Materials and Processing (CEAMP)NarmakIran
  2. 2.School of Metallurgy and Materials EngineeringIran University of Science and Technology (IUST)NarmakIran
  3. 3.Department of Mechanical EngineeringShahid Rajaee Teacher Training University (SRTTU)LavizanIran

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