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Constitutive description of creep behavior of M-4Al-1Ca alloy

Authors
  • Milička, K.1
  • Dobeš, F.1
  • 1 Academy of Sciences of the Czech Republic, Institute of Physics of Materials, Brno, Czech Republic , Brno (Czechia)
Type
Published Article
Journal
Strength of Materials
Publisher
Springer US
Publication Date
Jan 01, 2008
Volume
40
Issue
1
Pages
28–31
Identifiers
DOI: 10.1007/s11223-008-0008-x
Source
Springer Nature
Keywords
License
Yellow

Abstract

Creep behavior of an advanced magnesium alloy AX41 (4 wt.% Al, 1 wt.% Ca, Mg balanced) was investigated in temperature interval from 343 to 673 K and stresses from 2 to 200 MPa. Compressive creep experiments with stepwise loading were used in order to obtain stress dependence of the creep rate in interval from 10−9 to 10−3 s−1 for a given temperature. All stress dependences can be well described by the Garofalo sinh relationship with natural exponent n = 5. An analysis of the parameters of this relationship has shown that lattice diffusion controls creep at all experimental conditions. While climb-controlled creep mechanism is decisive at lower stresses and higher temperatures, glide-controlled mechanisms act at higher stresses and lower temperatures. A typical power-law breakdown is observed at intermediate stresses and temperatures.

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