Lattice correspondence analysis on the formation mechanism for partial stacking faults in hexagonal close-packed metals

Partial stacking faults (PSFs) have been frequently observed inside {101-1} and {101-2} twins in hexagonal close-packed (HCP) metals. Formation of PSFs, first described by Song Gray, only displaces atoms on every other basal plane, stark contrast to conventional SFs created Shockley partial dislocations which a global displacement vector can be defined. To experimentally verify this process is challenging. understand the formation mechanism work, we performed lattice correspondence analysis atomistic simulations twinning modes Mg, Ti Co. In strategy, corresponding planes parent prismatic plane twin were pre-selected tracked before after twinning. Then, atomic positions examined reveal position change due SFs. The results show that, indeed, those are displaced indicating that no defined dislocation activities involved PSFs. Thus, proposition PSF validated. A special configuration PSFs was observed, has limited mobility via coordinated shuffles. detailed structural differences between I1, I2 provided. extended HCP