Investigation on the size effect of twinning in HCP single crystals

Abstract eng:
Summafy. inning is generally consider d to be the p imary deformation mechanism for hexag nal close-pac ed (hcp) met ls due to their limited slip systems. Recent microcompression experiments point to strong size ef ects indicatin that pyrami al slips can do inate in deformation under compression. In this work, olecular dynamics simulations are applied to investig te the deformation mechanis s of magnesium and titani In single cry tals under compression at he nanoscale. It is found t at pyramidal slip dominate the comp ession defor ation, which is consis ent with e perimental bservations on microcompression. We als present anal sis on the twinnability of a ideal hcp si gle crystal at the nanoscale. A criterion or deformation twinning is derived by considering the elastic lattice-rotation strain. his analysis gives an inter retation of size effects in def rmation twin ing, at the sa e time it provides an explanation for the so-called stren th differential effect.

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