Direct observation of dual-step twinning nucleation in hexagonal close-packed crystals

Yang He, Bin Li, Chongmin Wang () and Scott X. Mao ()
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Yang He: Department of Mechanical Engineering and Materials Science, University of Pittsburgh
Bin Li: Department of Chemical and Materials Engineering, University of Nevada
Chongmin Wang: Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory
Scott X. Mao: Department of Mechanical Engineering and Materials Science, University of Pittsburgh

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Design and processing of advanced lightweight structural alloys based on magnesium and titanium rely critically on a control over twinning that remains elusive to date and is dependent on an explicit understanding on the twinning nucleation mechanism in hexagonal close-packed (HCP) crystals. Here, by using in-situ high resolution transmission electron microscopy, we directly show a dual-step twinning nucleation mechanism in HCP rhenium nanocrystals. We find that nucleation of the predominant {1 0 −1 2} twinning is initiated by disconnections on the Prismatic│Basal interfaces which establish the lattice correspondence of the twin with a minor deviation from the ideal orientation. Subsequently, the minor deviation is corrected by the formation of coherent twin boundaries through rearrangement of the disconnections on the Prismatic│Basal interface; thereafter, the coherent twin boundaries propagate by twinning dislocations. The findings provide high-resolution direct evidence of the twinning nucleation mechanism in HCP crystals.

Date: 2020
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DOI: 10.1038/s41467-020-16351-0

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