scholarly journals A Tune for Lowering Lattice Friction

Physics ◽  
2020 ◽  
Vol 13 ◽  
Author(s):  
Rachel Berkowitz
Keyword(s):  
Lattice Friction

Core-structure and lattice friction of twinning dislocation in platinum

2021 ◽  
Vol 44 ◽  
pp. 2968-2971
Author(s):  
Sri Sadgun Reddy Pulagam ◽  
Sweta Kumari ◽  
Amlan Dutta
Keyword(s):  
Core Structure ◽  
Lattice Friction

Temperature Dependence of the Yield Stress in α-Titanium Investigated with Crystal Plasticity Analysis

2018 ◽  
Vol 941 ◽  
pp. 1474-1478
Author(s):  
Yelm Okuyama ◽  
Masaki Tanaka ◽  
Tetsuya Ohashi ◽  
Tatsuya Morikawa
Keyword(s):  
Finite Element ◽  
Temperature Dependence ◽  
Yield Stress ◽  
Crystal Plasticity ◽  
Slip Systems ◽  
Temperature Dependent ◽  
Element Analysis ◽  
Pyramidal Slip ◽  
Active Slip ◽  
Lattice Friction

The effect of the activated slip systems on the temperature dependence of yield stress was investigated in α-Ti by using crystal plasticity finite element method. A model for finite element analysis (FEA) was constructed based on experimental results. The displacement in FEA was applied up to the nominal strain of 4% which is the same strain as the experimental one. Stress-strain curves were obtained, which corresponds to experimental data taken every 50 K between 73 K and 673 K. The used material constants which are temperature dependent were elastic constants, and lattice friction stresses. The lattice friction stresses of basal slip systems were set to be higher than that of pyramidal slip systems at 73 K. Then, the lattice friction stresses were set to be closer as the temperature increases. It was found that the activation of slip systems is strong temperature dependent, and that the yield stress depends on the number of active slip systems.

RATE PROCESS OF YIELDING IN SOME BODY-CENTERED CUBIC ALKALI METALS

2010 ◽  
Vol 24 (22) ◽  
pp. 4233-4242
Author(s):  
N. MUSHTAQ ◽  
M. Z. BUTT
Keyword(s):  
Flow Stress ◽  
Alkali Metals ◽  
Rate Process ◽  
Body Centered Cubic ◽  
Initial Flow ◽  
Thermally Activated ◽  
Kink Pair ◽  
Localized Defects ◽  
Critical Resolved Shear Stress ◽  
Lattice Friction

Temperature dependence of the critical resolved shear stress (CRSS) of 5N pure body-centered cubic (bcc) alkali metals K , Li , and Na has been critically examined within the framework of the Feltham–Butt model of flow stress in crystals with high intrinsic lattice friction. The model is based on the concept of the Peierls mechanism, i.e., the kink-pair mode of escape of screw dislocations trapped in Peierls valleys. It predicts that the square–root of CRSS, τ1/2, varies with the temperature, T, in accord with the relation τ1/2 = A – BT, where A and B are positive constants. Evaluation of the microscopic parameters of the model from the experimental τ – T data shows that the Peierls mechanism on (321) plane is responsible for the initial flow stress in K single crystal at rather low temperatures between 1.5 and 25 K. However, the rate–controlling process of yielding in Li (90–300 K) and Na (50–150 K) single crystals is not Peierls mechanism but stress-assisted, thermally activated, breakaway of edge-dislocation segments from short rows of pinning points due to localized defects, by cooperative unzipping and at the same time expanding in the shape of shallow bulge to the saddle point.

1222 Effect of lattice friction stress on the dislocation accumulation in ULSI cells

2005 ◽  
Vol 2005.18 (0) ◽  
pp. 491-492
Author(s):  
Michihiro SATO ◽  
Tetsuya OHASHI ◽  
Takuya MARUIZUMI ◽  
Isao KITAGAWA
Keyword(s):  
Friction Stress ◽  
Lattice Friction

Incorporating atomistic data of lattice friction into BCC crystal plasticity models

2012 ◽  
Vol 37 ◽  
pp. 16-30 ◽  
Author(s):  
Christopher R. Weinberger ◽  
Corbett C. Battaile ◽  
Thomas E. Buchheit ◽  
Elizabeth A. Holm
Keyword(s):  
Crystal Plasticity ◽  
Lattice Friction
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