Direct observations of defects in quenched gold

Silcox, J.; Hirsch, P. B.

doi:10.1080/14786435908238228

Cited by 416 publications

(83 citation statements)

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“…In the conventional bulk samples, SFT form mostly because of irradiation or quenching alone 3,4 , whereas in the nanocrystals, SFT can form directly from dislocation interactions. Moreover, the dislocation-SFT interaction is known to cause the SFT to be sheared into two defects, converted to other types of defects or structurally destroyed 13,[18][19][20][21] .…”

Section: Discussionmentioning

confidence: 99%

“…SFT have usually been classified as a vacancy-originated volume defect in quenched or irradiated metals and alloys 1,[3][4][5][6] . However, it is unlikely that the SFT observed in the Au nanocrystals of this work are vacancy-originated.…”

Section: Discussionmentioning

confidence: 99%

“…In 1959, Silcox and Hirsch 4 first observed SFT in quenched gold (Au). They proposed that SFT were formed from the Frank dislocation loops generated by collapsed vacancy clusters, which further dissociated through the Silcox-Hirsch mechanism 1,4 to produce the three-dimensional (3D) SFT. Since then, extensive studies have been conducted on the vacancyoriginated SFT in quenched, irradiated or plastically deformed bulk FCC crystals .…”

mentioning

confidence: 99%

“…Among these defects, stacking fault tetrahedra (SFT), bounded by stacking faults (SFs) and stair-rod dislocations, are peculiar types of volume defect typically found in face-centred cubic (FCC) crystals with low stacking fault energy 1,3 . Generally, SFT can be introduced by three methods, that is, quenching, high-energy particle irradiation and plastic deformation [3][4][5][6][7][8] . In 1959, Silcox and Hirsch 4 first observed SFT in quenched gold (Au).…”

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confidence: 99%

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Atomic-scale dynamic process of deformation-induced stacking fault tetrahedra in gold nanocrystals

et al. 2013

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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 metals and alloys. All of the stacking fault tetrahedra experimentally observed to date are believed to originate from vacancies. Here we report, in contrast to the classical vacancyoriginated ones, a new kind of stacking fault tetrahedra formed via the interaction and crossslip of partial dislocations in gold nanocrystals. The complete atomic-scale processes of nucleation, migration and annihilation of the dislocation-originated stacking fault tetrahedra are revealed by in situ high-resolution observations and molecular dynamics simulations. The dislocation-originated stacking fault tetrahedra can undergo migration and annihilation due to mechanical loading in a manner that is not expected in bulk samples. These results uncover a unique deformation mechanism via dislocation interaction inside the confined volume of nanocrystals and have important implications regarding the size effect on the mechanical behaviour of small-volume materials.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Atomic-scale dynamic process of deformation-induced stacking fault tetrahedra in gold nanocrystals

et al. 2013

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“…Тетраэдры дефектов укладки в закаленном золоте оказываются устой-чивыми против отжига вплоть до 400° С, что согласуется и с фактическим изменением свойств и с тем простым соображением, что сокращение те-траэдра связано с образованием широких порогов на его гранях 78 . Вместе с тем остается все еще неясным вклад в закалочные эф-фекты со стороны невидимых скоплений вакансий и порогов на дисло-кациях.…”

Section: дислокации и точечные дефектыunclassified