Size dependence and stochastic nature of yield strength of micron-sized crystals: a case study on Ni3Al

Ngan, A. H. W., Zuo, L. and Wo, P. C. (2006) Size dependence and stochastic nature of yield strength of micron-sized crystals: a case study on Ni3Al. Royal Society of London. Proceedings. Mathematical, Physical and Engineering Sciences, 462 2070: 1661-1681. doi:10.1098/rspa.2005.1645


Author Ngan, A. H. W.
Zuo, L.
Wo, P. C.
Title Size dependence and stochastic nature of yield strength of micron-sized crystals: a case study on Ni3Al
Journal name Royal Society of London. Proceedings. Mathematical, Physical and Engineering Sciences   Check publisher's open access policy
ISSN 1364-5021
Publication date 2006-06-08
Sub-type Article (original research)
DOI 10.1098/rspa.2005.1645
Volume 462
Issue 2070
Start page 1661
End page 1681
Total pages 21
Place of publication London
Publisher Taylor & Francis
Language eng
Subject 100708 Nanomaterials
100712 Nanoscale Characterisation
Abstract Recent experiments indicate that the first yield point of micron-sized metals exhibits significant statistical scatter as well as strong dependence on the specimen size. In this work, molecular dynamics (MD) simulations are carried out to investigate the onset of shear deformation in a small block of material, using an embedded atom potential for the intermetallic Ni;jAl alloy. Incipient plasticity in the form of homogeneous dislocation generation is observed to occur at atomic sites with interatomic displacements approaching one-half of the Shockley partial Burgers vector. From the distribution function of the interatomic displacements observed in the MD simulations, the probability of a general material volume surviving under given loading conditions is predicted. The survival probability is then calculated for several situations, including homogeneous deformation and nanoindentation, to predict the critical load for incipient plasticity to occur in these situations. The predicted results are compared to micro-pillar compression and nanoindentation experiments on Ni3Al available in the literature.
Keyword incipient plasticity
dislocation
molecular dynamics
yield strength
crystalline materials
nanoindentation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemistry and Molecular Biosciences
 
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