scholarly journals Twin boundary spacing effects on shock response and spall behaviors of hierarchically nanotwinned fcc metals

2014 ◽  
Vol 115 (6) ◽  
pp. 063509 ◽  
Author(s):  
Fuping Yuan ◽  
Liu Chen ◽  
Ping Jiang ◽  
Xiaolei Wu
Keyword(s):  
Twin Boundary ◽  
Fcc Metals ◽  
Spacing Effects ◽  
Boundary Spacing ◽  
Shock Response

scholarly journals Effect of Twin Boundary Motion and Dislocation-Twin Interaction on Mechanical Behavior in Fcc Metals

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2238
Author(s):  
Jaber Rezaei Mianroodi ◽  
Bob Svendsen
Keyword(s):  
Twin Boundary ◽  
Partial Dislocation ◽  
Shear Loading ◽  
Dislocation Nucleation ◽  
The Other ◽  
Boundary Motion ◽  
Normal Loading ◽  
Fcc Metals ◽  
Boundary Orientation ◽  
Normal Twin

The interplay of interface and bulk dislocation nucleation and glide in determining the motion of twin boundaries, slip-twin interaction, and the mechanical (i.e., stress-strain) behavior of fcc metals is investigated in the current work with the help of molecular dynamics simulations. To this end, simulation cells containing twin boundaries are subject to loading in different directions relative to the twin boundary orientation. In particular, shear loading of the twin boundary results in significantly different behavior than in the other loading cases, and in particular to jerky stress flow. For example, twin boundary shear loading along ⟨ 112 ⟩ results in translational normal twin boundary motion, twinning or detwinning, and net hardening. On the other hand, such loading along ⟨ 110 ⟩ results in oscillatory normal twin boundary motion and no hardening. As shown here, this difference results from the different effect each type of loading has on lattice stacking order perpendicular to the twin boundary, and so on interface partial dislocation nucleation. In both cases, however, the observed stress fluctuation and “jerky flow” is due to fast partial dislocation nucleation and glide on the twin boundary. This is supported by the determination of the velocity and energy barriers to glide for twin boundary partials. In particular, twin boundary partial edge dislocations are significantly faster than corresponding screws as well as their bulk counterparts. In the last part of the work, the effect of variable twin boundary orientation in relation to the loading direction is investigated. In particular, a change away from pure normal loading to the twin plane toward mixed shear-normal loading results in a transition of dominant deformation mechanism from bulk dislocation nucleation/slip, to twin boundary motion.

scholarly journals Response surface for screw dislocation: Twin boundary interactions in FCC metals

2020 ◽  
Vol 195 ◽  
pp. 681-689
Author(s):  
Satish I. Rao ◽  
Maxime Dupraz ◽  
C. Woodward ◽  
T.A. Parthasarathy
Keyword(s):  
Response Surface ◽  
Screw Dislocation ◽  
Twin Boundary ◽  
Fcc Metals

scholarly journals Twin Boundary Interactions in FCC Metals Observed Using the In-situ TEM Deformation Technique

2006 ◽  
Vol 12 (S02) ◽  
pp. 936-937
Author(s):  
B Miller ◽  
I Robertson
Keyword(s):  
Twin Boundary ◽  
In Situ Tem ◽  
Fcc Metals

Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2006

Twin boundary spacing-dependent deformation behaviours of twinned silver nanowires

2015 ◽  
Vol 41 (18) ◽  
pp. 1546-1552 ◽  
Author(s):  
Yajun Gao ◽  
Yinlu Sun ◽  
Yongbo Yang ◽  
Qian Sun ◽  
Jianwei Zhao
Keyword(s):  
Twin Boundary ◽  
Silver Nanowires ◽  
Boundary Spacing

scholarly journals Twin boundary spacing-dependent friction in nanotwinned copper

2012 ◽  
Vol 85 (5) ◽  
Author(s):  
Junjie Zhang ◽  
Yujie Wei ◽  
Tao Sun ◽  
Alexander Hartmaier ◽  
Yongda Yan ◽  
...  
Keyword(s):  
Twin Boundary ◽  
Boundary Spacing

Effect of twin boundary spacing on the deformation behaviour of Au nanowire

2020 ◽  
Vol 581 ◽  
pp. 411952
Author(s):  
Zhaoyang Hou ◽  
Qixin Xiao ◽  
Zhen Wang ◽  
Jinguo Wang ◽  
Rangsu Liu ◽  
...  
Keyword(s):  
Twin Boundary ◽  
Deformation Behaviour ◽  
Boundary Spacing ◽  
Au Nanowire
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