Orientation effect on twin formation mechanisms of tungsten under uniaxial tension/compression

YC Li and HX Xie and D Zhen, MATERIALS TODAY COMMUNICATIONS, 36, 106790 (2023).

DOI: 10.1016/j.mtcomm.2023.106790

The orientation effect on the twin formation mechanism of body-centered cubic tungsten nanopillars was systematically investigated by molecular dynamics simulation. The simulation results reveal that anti-twins grow by the two-layer-by-two-layer staggered-shuffle mechanism. Tungsten nanopillars with their orientations close to 001 in the standard stereoscopic triangle are dominated by the twinning (anti-twinning) mode under tension (compression). On the contrary, tungsten nanopillars with their orientations close to the edge of 101-111 are dominated by the anti-twinning (twinning) mode under tension (compression). Tungsten nanopillars with their orientations in the center region of the standard stereoscopic triangle are dominated by twinning mode under both tension and compression. The above simulation results were discussed and well explained in terms of the Schmid factor and energy. The present work will extend our knowledge about the twin formation mechanism of body- centered cubic metals.

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