2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 1: Aifantis Intl. Symp. / Multiscale Material Mechanics
| Editors: | Kongoli F, Bordas S, Estrin Y |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 300 pages |
| ISBN: | 978-1-987820-24-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
< CD shopping page
Dislocation Network Formation in a Coherent Twin Boundary in Face-Centered Cubic Metals
Jongbae Jeon1; Junho Kim2; Wang Ryeol Kim2; Inoeck Baek2; Eunyoung Choi2; Seungjin Kim2; Minjae Park2;1KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY, Yangsan, Korea (Republic of [South] Korea); 2KITECH, Yangsan, Korea (Republic of [South] Korea);
Type of Paper: Regular
Id Paper: 443
Topic: 1
Abstract:
Face-centered cubic (FCC) materials containing twins such as twin-induced plasticity (TWIP) steels and nano-crystalline copper and nickel have exhibited an attractive combination of properties such as strength and ductility. Recently, there has been thus a significant interest in the deformation behavior of FCC metals involving twins. Traditionally, the coherent twin boundary (CTB) is regarded as a strong barrier to dislocation penetration unless dislocations run through the boundary or transfer with easy cross-slip. Although it is well established that slip is strongly affected by twin boundaries, the detailed aspects of dislocation-twin boundary interactions are not yet fully understood.
We here present the detailed reactions between dislocations and CTB and the resultant formation of dislocation networks in several FCC metals using atomistic simulations. It is found that dislocation networks are mainly composed of sessile Frank dislocations and partially of sessile stair-rod and Hirth dislocations and glissile twinning dislocations. The density and type of dislocations in the networks were found to be dependent on the materials' factors such as generalized stacking fault energy and also external factors like loading axis. The present work could provide insight to understand the source of the huge work-hardening rate and high stability of twin boundaries exhibited in TWIP steels.