Migration of tilt boundaries in nickel and Ni3Al intermetallide: a molecular dynamics study

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

Poletaev, G.M.^1 ; Zorya, I.V.^2 ; Rakitin, R.Y.^3 ; Iliina, M.A.^4 ; Starostenkov, M.D.^1

Altai State Technical University, 46 Lenin St., Barnaul

656038, Russia^1

Siberian State Industrial University, 42 Kirov St., Novokuznetsk

54007, Russia^2

Altai State University, 61 Lenin St., Barnaul

656049, Russia^3

Financial University under the Government of the Russian Federation, 54 Lenin St., Barnaul

656036, Russia^4

关键词: Boundary migration;    Energy expenditure;    Low mobility;    Migration rates;    Molecular dynamics methods;    Tilt boundaries;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/447/1/012023/pdf
DOI  :  10.1088/1757-899X/447/1/012023

来源: IOP

【 摘 要 】

The study of migration ofandtilt boundaries in Ni and the Ni3Al intermetallide is performed by the molecular dynamics method. It is shown that in Ni and Ni3Al, the low-angleboundaries migrate much slower than theboundaries (approximately twice at a temperature of 1700 K) due to the difference in the mechanisms of migration of the low-angleandboundaries. According to the obtained results, the migration rate of similar boundaries in the Ni3Al intermetallide is much lower than in Ni (approximately three times at 1700 K). The reason for this is mainly the additional energy expenditure for the formation of a disordered area in Ni3Al behind the migrating boundary. Due to the relatively low mobility of the boundaries in Ni3Al, the contribution of diffusion displacements of atoms in the process of boundary migration is higher than in Ni.