THE PLASTIC DEFORMATION OF MAGNESIUM.
MICHIGAN UNIV ANN ARBOR DEPT OF CHEMICAL AND METALLURGICAL ENGINEERING
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Deformation studies were conducted at room temperature on single crystals and textured polycrystals of magnesium and magnesium alloys with thorium and with lithium. Single crystals oriented to suppress shear on the easily activated basal slip systems were deformed by plane-strain compression. Compression along the c-axis was accommodated by 10-11 banding. Compression perpendicular to the unconstrained c-axis activated 10-12 twinning, and, after virtually complete twinning, deformation continued by 10-11 banding in the twinned material. Compression perpendicular to the constrained c-axis was accommodated by the simultaneous operation of 10-12 twinning against the constrain and 10-11 banding. Although this orientation was favorable for 10-10 12-10 prism and 10-11 12-10 pyramidal slip, these modes were not observed in pure magnesium or in Mg-.5Th. However, 10-10 12-10 prism slip was active in crystals of Mg-4Li during compression perpendicular to the constrained c-axis. Fracture in all materials occurred parallel to 11-24 or 10-11 depending on the orientation and composition of the specimen. Author
- Metallurgy and Metallography