Effect of c/a axial ratio on Schmid factors in hexagonal close-packed metals

Schmid factors (m) for typical slip modes (basal (a), prismatic (a), pyramidal (a) and (c + a) slips) and twinning patterns ({10 (1) over bar2} and {10 (1) over bar1} twins) were systematically calculated in hexagonal close-packed Cd, Zn, Mg, Zr, Ti and Be. A monotonic effect on m-values was presented for pyramidal (a) and (c + a) slips, and {10 (1) over bar2} and {10 (1) over bar1} twinning patterns with decreasing c/a ratio. The results calculated herein were used to characterize deformation behaviors and provide essential data for anisotropic feature analysis. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.