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КООПЕРАТИВНЫЕ АТОМНЫЕ СМЕЩЕНИЯ ВБЛИЗИ МЕЖФАЗНЫХ ГРАНИЦ NI-γFE

КООПЕРАТИВНЫЕ АТОМНЫЕ СМЕЩЕНИЯ ВБЛИЗИ МЕЖФАЗНЫХ ГРАНИЦ NI-γFE

Abstract

By method of molecular dynamics studied the cooperative atomic displacements near the interface a bimetal solid-phase contact Ni-γFe. The differences in the behavior of the Ni and Fe atoms with their participation in the process of mass transfer across borders is established. Currently still a lot of unresolved issues related to the atomic structure of interfaces and mechanisms of their interaction with a variety of defects generated by, for example, by radiation exposure. In particular, special interest is the cooperative atomic displacements near the interphase boundaries and their contribution to the transport of energy and mass. It is shown that the introduction of interstitial atoms near the interface can cause a cooperative atomic displacements that lead to the climb of misfit dislocations. All cooperative atomic displacements proceeded on crowdions mechanism along the packed rows. The differences of behavior of atomic displacements on the number of interstitial atoms, and their type. The differences in the behavior of atoms, apparently, due to the high binding energy of the type Ni-γFe compared with connections type γFe-γFe, resulting in the Fe atoms are more mobile than the Ni atoms and penetrate through the interface is much more intense. Such activity of Fe atoms near the interface Ni-γFe border creates the preconditions for the consideration of such phenomena in the boundary as the basis for the creation of new materials with specific desired properties.

Методом молекулярной динамики исследованы кооперативные атомные смещения вблизи межфазной границы в условиях твердофазного контакта биметалла Ni-γFe. Выявлены различия в поведении атомов Ni и Fe при их участии в процессе межграничного массопереноса.В настоящее время остается достаточно много нерешенных вопросов, связанных с атомной структурой межфазных границ и механизмами их взаимодействия с различными дефектами, порожденными, например, радиационным воздействием. В частности, особый интерес вызывают кооперативные атомные смещения вблизи межфазных границ и их вклад в транспорт энергии и массы.В работе показано, что внедрение межузельных атомов вблизи межфазной границы может вызывать кооперативные атомные смещения, приводящие к переползанию дислокаций несоответствия. Все кооперативные атомные смещения протекали по краудионному механизму вдоль плотноупакованных рядов. Выявлены различия поведения таких атомных смещений от количества внедренных атомов, и их типа. Различия в поведении атомов, по всей видимости, объясняются высокой энергией связи типа Ni-γFe по сравнению со связями типа γFe-γFe, в результате чего атомы Fe оказываются более подвижными, чем атомы Ni, и проникают через межфазную границу гораздо интенсивнее. Подобная активность атомов Fe вблизи межфазной границы Ni-γFe создает предпосылки для рассмотрения подобных граничных явлений в качестве основы для создания новых материалов с определенными заданными свойствами.

Keywords

БИМЕТАЛЛ,КООПЕРАТИВНЫЕ АТОМНЫЕ СМЕЩЕНИЯ,ДИСЛОКАЦИЯ НЕСООТВЕТСТВИЯ,МЕЖФАЗНАЯ ГРАНИЦА,МЕТОД МОЛЕКУЛЯРНОЙ ДИНАМИКИ,BIMETAL,COOPERATIVE ATOMIC DISPLACEMENTS,MISFIT DISLOCATIONS,INTERPHASE BOUNDARY,THE METHOD OF MOLECULAR DYNAMICS

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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