Study on the Creep Properties and Microstructures of EW75 Alloy

Abstract:

The creep properties and microstructures of the aged (220°C, 6h) EW75 magnesium alloy at different temperature and of stress conditions were studied. The experimental results show that, the deformation temperature and deformation rate have visible influence on flow stress curve of EW75 alloy. When the deformation temperature was constant, the stress rheological increases with the strain rate increasing. When the deformation rate was constant, the flow stress decreases with the deformation temperature increasing. When the deformation temperature was low or deformation rate was quickly, the shear fracture was along 45° direction. At low temperature and high strain rate conditions, the recrystallization of EW75 alloy was not obvious. When raising the temperature and decreasing deformation rate, the dynamic recrystallization ratio was improved markedly. The generating and moving of dislocations during deformation were main factor to determine the final microstructures. At 100MPa, 200°C conditions, the creep rate control mechanism of EW75 alloy was dislocation slip by solute drag. Precipitation phases coarsening was the main reason that the creep properties of EW75 alloy decreased.

• Periodical: Applied Mechanics and Materials (Volumes 633-634)
• Pages: 133-136
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.633-634.133
• Online since: September 2014
• Authors: Yong Jun Li*, Xing Gang Li, Kui Zhang
• Keywords: Creep Properties, EW75 Magnesium Alloy, Microstructure

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