Growth mode of helium crystal near dislocations in titanium

doi:10.1088/1674-1056/27/6/060205

Abstract The helium bubble structure and growth modes near dislocations in titanium are studied using the molecular dynamics method. A helium crystal with an HCP structure in titanium is found to have a lattice constant of 1.977 Å at 0 K. On either side of the slip plane, helium bubbles form in the (001) plane, but they are in different growth modes. On the side of the slip plane with full atomic layers, helium bubbles grow toward the slip plane and easily cross the slip plane. In the growth process, the position of the top surface of the helium bubble remains almost unchanged. On the other side of the slip plane, the helium bubble grows initially toward the dislocation core, but it is difficult to cross the slip plane, which results in growth in the opposite direction upon reaching the slip plane.

Keywords: molecular dynamics helium bubble structure titanium

Received: 07 December 2017
Revised: 31 January 2018
Accepted manuscript online:

PACS:	02.70.Ns	(Molecular dynamics and particle methods)
	28.52.Fa	(Materials)

Fund: Project supported by the National Natural Science Foundation of China (Grant No.11505120) and the Project of Innovative Talents of North China University of Water Resources and Electric Power,China (Grant No.70483).

Corresponding Authors: Bao-Ling Zhang
E-mail: zbaoling1234@163.com

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Bao-Ling Zhang(张宝玲), Bao-Wen Wang(王保文), Xue Su(苏雪), Xiao-Yong Song(宋小勇), Min Li(李敏) Growth mode of helium crystal near dislocations in titanium 2018 Chin. Phys. B 27 060205

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Growth mode of helium crystal near dislocations in titanium

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