Scenarios of mass transfer in fcc copper: the role of point defects

Open School-Conference of NIS Countries Ultrafine Grained and Nanostructured Materials

Bayazitov, A.M.^1 ; Korznikova, E.A.^2 ; Shepelev, I.A.^3 ; Chetverikov, A.P.^3 ; Khadiullin, Kh S.^4 ; Sharapov, E.A.^4 ; Zakharov, P.V.^5 ; Dmitriev, S.V.^2,6

Bashkir State University, 32 Zaki Validi st., Ufa

450000, Russia^1

Institute for Metals Superplasticity Problems of RAS, 39 Stepan Khalturin st., Ufa

450001, Russia^2

Saratov Chernyshevsky State University, 83 Astrakhanskaya st., Saratov

410012, Russia^3

Ufa State Aviation Technical University, 12 K. Marx st., Ufa

450008, Russia^4

Altai State Humanitarian and Pedagogical University, 53 Korolenko st., Biysk

659333, Russia^5

National Research Tomsk State University, 36 Lenin Ave., Tomsk

634050, Russia^6

关键词: Crowdions;    Interstitial atoms;    Interstitial defects;    Migration energy;    Molecular dynamics simulations;    Study scenarios;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/447/1/012040/pdf
DOI  :  10.1088/1757-899X/447/1/012040

来源: IOP

【 摘 要 】

It is well known that mass transfer in crystalline materials in most cases is assisted by the motion of point defects. Interstitial atoms are highly mobile, because they have relatively small migration energy as compared to vacancies. Crowdion is a type of interstitial defect being an extra atom inserted in a closely packed atomic row and having even smaller migration energy than an interstitial atom occupying a pore. In this work, we study scenarios of collisions of supersonic N-crowdions in Cu by means of molecular dynamics simulation. It was found that 2-crowdions collide leading to the emergence of two new 2-crowdions, which is an example of the soliton-type interaction.