Investigation of precipitate refinement in Mg alloys by an analytical composite failure model
作者： Ali Tabei , DS Li , Curt A Lavender , Hamid Garmestani , None
DOI: 10.1016/J.MECHMAT.2015.05.007
关键词:
摘要: Abstract An analytical model is developed to simulate precipitate refinement in second phase strengthened magnesium alloys. The based on determination of the stress fields inside elliptical precipitates embedded a rate dependent inelastic matrix. are utilized determine failure mode that governs behavior. Using an AZ31 Mg alloy as example, effects applied load, aspect ratio and orientation particle studied macroscopic single α -Mg 17 Al 12 precipitate. Additionally, temperature version corresponding constitutive law used incorporate temperature. In plane strain compression, extensional always fragments precipitates. critical at which start fail strongly depends with respect loading direction. results show higher is, easier fractures. Precipitate shape another factor influencing response. contrast high ratio, spherical resistant sectioning. pure shear loading, addition failure, shearing may get activated depending effect relation was also verified for compression cases.
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