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Optimization of the Mg–Al–Zn–Ca–Sr alloy composition based on the parameter A′ in the constitutive equation for the climb-controlled dislocation creep including the stacking fault energy
- Source :
- Materials Science and Engineering: A. 551:19-24
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- In this study, calcium, Ca-, and strontium, Sr-added AZ91 magnesium alloys, which were composed of magnesium, Mg–9 wt.% aluminum, Al–0.8 wt.% zinc, Zn–x wt.% Ca–y wt.% Sr, were formulated and designated as AZXJ91xy alloys. The optimum composition of die-cast AZXJ alloys has been studied by micro-structural analysis and through the application of the constitutive equation of deformation behavior at elevated temperatures that includes the stacking fault energy. The normalized plots of the tensile test results of AZXJ alloys at 448 K by the constitutive equation of deformation behavior indicated that the deformation mechanism of the alloys was climb-controlled dislocation creep. The value of the constant A′ in the constitutive equation differs in the different AZXJ alloys, even though the effect of the solid solution of added elements, which is considered in the stacking fault energy term, was eliminated from A′. Using A′ as an indicator parameter of the creep resistance with the tensile strength at ambient temperature, the optimum composition of the creep-resistant Mg–Al–Zn–Ca–Sr alloy has been determined, and its creep resistance was comparable to those of known heat-resistant magnesium alloys.
- Subjects :
- Dislocation creep
Materials science
Mechanical Engineering
Metallurgy
Alloy
engineering.material
Condensed Matter Physics
Creep
Deformation mechanism
Mechanics of Materials
Stacking-fault energy
Ultimate tensile strength
engineering
General Materials Science
Deformation (engineering)
Composite material
Tensile testing
Subjects
Details
- ISSN :
- 09215093
- Volume :
- 551
- Database :
- OpenAIRE
- Journal :
- Materials Science and Engineering: A
- Accession number :
- edsair.doi...........64138fd6550c5cbe5bb38d2ebc9416b4