Formation and stability of long basal-prismatic facets in Mg

Dang, Khanh; Wang, Shujuan; Gong, Mingyu; McCabe, Rodney J.; Wang, Jian; Capolungo, Laurent

doi:10.1016/j.actamat.2019.11.070

Cited by 35 publications

(13 citation statements)

References 47 publications

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“…Figure 2D shows the atomic structure of a BP facet with dislocations labeled in the boundary. On the basis of the atomic structure, we studied the formation and stability of long BP facets in Mg in a recent paper (33).…”

Section: { ¯ 1 012} Twins Facets Viewed From <1mentioning

confidence: 99%

Characteristic boundaries associated with three-dimensional twins in hexagonal metals

et al. 2020

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Twinning is a critically important deformation mode in hexagonal close-packed metals. Twins are three-dimensional (3D) domains, whose growth is mediated by the motion of facets bounding the 3D twin domains and influences work hardening in metals. An understanding of twin transformations therefore necessitates that the atomic-scale structure and intrinsic mobilities of facets be known and characterized. The present work addresses the former point by systematically characterizing the boundary structures of 3D {1¯012} twins in magnesium using high-resolution transmission electron microscopy (HRTEM). Eight characteristic facets associated with twin boundaries are reported, five of which have never been experimentally observed before. Further, molecular dynamics simulations suggest that the formation and motion of these facets is associated with the accumulation of twinning dislocations. This work provides insights into understanding the structural character of 3D twins and serves to develop strategies for modulating twin kinetics by modifying twin boundaries, such as solute segregation.

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Section: { ¯ 1 012} Twins Facets Viewed From <1mentioning

confidence: 99%

Characteristic boundaries associated with three-dimensional twins in hexagonal metals

et al. 2020

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“…Migration of coherent facets without stress relaxation is first investigated. Dang et al [28] showed that the migrating twin facets are in non-relaxed states. Facets summarized in Table 1 are simulated.…”

Section: Velocity Of Coherent Facets At Different Temperatures and St...mentioning

confidence: 99%

“…Another critical point was recently raised in the case of the PB facet; its structure and consequently its mobility can drastically change depending on stress. Specifically, using MD simulations and HRTEM, the atomicscale structures of BP facets in their unloaded / loaded states was characterized/simulated [28] . It was found using MD simulations that loaded BP serrated interfaces, which are composed of short coherent segments, relax into long coherent facets upon unloading.…”

Section: Introductionmentioning

confidence: 99%

“…Fully relaxed structures with misfit dislocations progressively form and eventually render the whole facet immobile. Conversely, upon subjecting this facet to a sufficiently large stress, MD simulations showed that these relaxed facets change back into a non-relaxed state and become mobile again [28] . Importantly, these results highlight that the level of stress relaxation of these interface structures have a strong effect on the corresponding stress and temperature dependent mobility.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast some interfaces, in particular the CTB and the BP/PB, show a strong dependence on stress and temperature. In light of the results mentioned above on the effect of stress relaxation on the structure and mobility of BP interfaces [28] , we further quantify the relation between the mobility and the level of stress relaxation mediated by misfit dislocations as a function the applied stress and the temperature. Finally, to assess how the behavior of individual facets can change when connected together to build a 3D twin domain, the growth of a nanotwin is simulated for applied stresses in the range 1GPa-2 GPa for temperatures in the range 10 0 K-50 0 K. All this data is used and analyzed by means of an anisotropic phase field model recently developed [9] .…”

Section: Introductionmentioning

confidence: 99%

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