Stacking Fault Tetrahedron - an overview | ScienceDirect Topics
SFTs are identified by their triangular images in weak-beam or two-beam conditions when observed from <110> direction. An example is shown in Fig. 7.6. SFTs can form in austenitic steels irradiated under a cascade regimen (ion and neutron irradiation) as well as under a Frenkel pair regimen (electron irradiation).
Molecular dynamics studies on formation of stacking fault tetrahedra …
2021年1月1日 · We study the formation of SFT based on the Silcox-Hirsch mechanism by collapsing the triangular plate of vacancies to Frank loop in case of low stacking fault energy Ag and an intermediate stacking fault energy Ni using MD simulation at low temperature of 1 K.
Stacking fault tetrahedra in metals - ScienceDirect
2015年1月1日 · Stacking fault tetrahedra (SFT) were first observed in samples of quenched gold, by Silcox and Hirsch in 1959 [1]. They suggested that the tetrahedra were formed by the clustering of the quenched-in vacancies to produce a faulted loop of b = 1/3〈1 1 1〉, which dissociated along the three 〈1 1 0〉 directions in the {1 1 1} plane of the loop.
The role of stacking fault tetrahedra on void swelling in …
2024年4月16日 · Here, by combining atomistic simulations and STEM imaging, we find stacking fault tetrahedra (SFTs) are the primary cause of the high swelling rate in pure fcc copper. We reveal that SFTs in...
Atomic-scale dynamic process of deformation-induced stacking fault ...
2013年8月15日 · Stacking fault tetrahedra, the three-dimensional crystalline defects bounded by stacking faults and stair-rod dislocations, are often observed in quenched or irradiated face-centred cubic...
Mobility and coalescence of stacking fault tetrahedra in Cu
2015年3月13日 · Stacking fault tetrahedra (SFTs) are ubiquitous defects in face-centered cubic metals. They are produced during cold work plastic deformation, quenching experiments or under irradiation.
Stacking-fault tetrahedra in annealed f.c.c. metals and alloys
Analyses of partially formed stacking-fault tetrahedra and intrinsic fault bends suggest that the tetrahedra arise from the annealing of intersecting faults in the newly recrystallized grains by a mechanism involving the formation of truncated tetrahedra from the earliest stage.
Closed and open-ended stacking fault tetrahedra formation along …
Stacking fault tetrahedra (SFTs) are volume defects that typically form by the clustering of vacancies in face-centred cubic (FCC) metals. Here, we report a dislocation-based mechanism of SFT formation initiated from the semi-coherent interfaces of Cu–Al nanoscale multilayered metals subjected to out-of-plane tension.
Direct transformation of equilateral hexagonal Frank vacancy …
2022年7月22日 · Stacking fault tetrahedra (SFTs) are highly interesting three-dimensional vacancy defects in quenched, plastically deformed or irradiated face-centered-cubic metals and have a significant impact on the properties and subsequent microstructural evolution …
Story of stacking fault tetrahedra - ScienceDirect
1997年9月1日 · Stacking fault tetrahedra, although they have a peculiar structure, are the most general type of vacancy clustered defects in f.c.c. metals and alloys. Placing these stacking fault tetrahedra at the center, the story of point defect reaction is told. The structure of the defect and the energy relation are first described.