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Twinning behavior of AM30 Mg alloy during uniaxial tension and compression

par Jiang, L.;Jonas, J.J.;Godet, Stéphane ;Luo, Alan
Référence International Symposium on Magnesium Technology in the Global Age(01.10.2006-04.10.2006: Montreal, QC, Canada), Magnesium Technology in the Global Age, page (431-440)
Publication Publié, 2006

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Résumé :

The evolution of twinning in an AM30 Mg alloy was examd. by uniaxial tension and compression testing at temps. from ambient to 250° and a strain rate of 0.1/s. The samples were cut along the extrusion direction from extruded AM30 Mg alloy tubes. Specimens deformed to various strain levels were examd. by optical microscopy and electron backscattered diffraction (EBSD) techniques. The results indicate that the initial extrusion texture plays an important role in the formation of different types of twins and that the twinning behavior also depends on the strain path. Contraction and double twinning are the dominant twinning mechanisms in uniaxial tension, while extension twinning prevails in uniaxial compression. The different twinning behaviors are shown to be responsible for the sharply contrasting strain hardening characteristics of the exptl. flow curves.