A lattice fraction stress model with consideration of thermal activation

This paper systematically investigates the effect of temperature on lattice friction stress and develops a thermally activated dislocation slip mechanism. The findings reveal that temperature has a significant impact on dislocation slip behavior. At low temperatures, the contribution of thermal acti...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2024-11, Vol.130 (11), Article 778
Main Authors: Sun, Guangpeng, Tian, Feng, Du, Juan, Wen, Bin
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
Dislocation density
Friction
High temperature
Low temperature
Machines
Manufacturing
Nanotechnology
Optical and Electronic Materials
Physics
Physics and Astronomy
Processes
Shear modulus
Slip
Strain rate
Surfaces and Interfaces
Temperature effects
Thin Films
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper systematically investigates the effect of temperature on lattice friction stress and develops a thermally activated dislocation slip mechanism. The findings reveal that temperature has a significant impact on dislocation slip behavior. At low temperatures, the contribution of thermal activation is minimal, leading to dislocation slip in an extended mode and resulting in higher lattice friction stress. In contrast, at high temperatures, the effect of thermal activation increases sharply, causing dislocations to slip in a full mode, thereby reducing lattice friction stress. Additionally, the influence of dislocation density, strain rate, and shear modulus on lattice friction stress is examined. Lattice friction stress decreases as dislocation density increases, but rises with higher strain rates and shear modulus. Overall, the model developed in this work provides a clearer understanding of the dislocation slip mechanism and sheds light on the underlying physical processes governing lattice friction stress.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-024-07946-1