Stochastic nature of plasticity of aluminum micro-pillars

Micron-sized aluminum pillars, fabricated by focused-ion beam milling, were subjected to compression in a nanoindenter using a flat-ended tip to examine their deformation behavior. The deformation was jerky and the statistical distributions of the sizes of the bursts, their occurrence frequency, as...

Full description

Saved in:
Bibliographic Details
Published in:Acta materialia 2008-05, Vol.56 (8), p.1712-1720
Main Authors: Ng, K.S., Ngan, A.H.W.
Format: Article
Language:English
Subjects:
Aluminum
Applied sciences
Bursts
Compression test
Computer simulation
Deformation
Dislocations
Exact sciences and technology
Mathematical models
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Monte Carlo methods
Monte Carlo techniques
Nanoindenation
Nanostructure
Plastic deformation
Stochasticity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Micron-sized aluminum pillars, fabricated by focused-ion beam milling, were subjected to compression in a nanoindenter using a flat-ended tip to examine their deformation behavior. The deformation was jerky and the statistical distributions of the sizes of the bursts, their occurrence frequency, as well as the stresses at which they occurred were analyzed. The burst size was found to increase with stress in an approximately exponential manner. Post-mortem transmission electron microscopy investigation of the dislocation structures revealed that the dislocation density of the micro-pillars did not grow significantly after severe deformation. Based on the experimental observations, a Monte Carlo model was developed to describe the stochastic nature of deformation of these micro-pillars.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2007.12.016