Paper Titles
An Internal Variable Approach to Inelastic Deformation Including Structural Superplasticity
p.1
Mechanics of Carbon Nanotubes: A Continuum Theory Based on Interatomic Potentials
p.11
Plasticity-Related Microstructure-Property Relations for Materials Design
p.21
Discrete Dislocation Modeling of Plastic Flow Processes
p.31
Nanoindentation-Induced Collective Dislocation Behavior and Nanoplasticity
p.39
Analyses of Cavitation Instabilities in Ductile Metals
p.49
The Effect of Heating Rate on the Formability of Bulk Metallic Glass in a Supercooled Liquid Region
p.59
Investigation of the Dynamic Buckling in the Carbon Nanotube under Impact Torque
p.65
Deformation Behavior of Dual-Phase LTSP Ti3Al Based Alloy
p.71

Nanoindentation-Induced Collective Dislocation Behavior and Nanoplasticity

Article Preview

Abstract:

The present paper summarizes the crystallographic dependence of the displacement burst behavior observed in nanoindentation using two single crystalline aluminum (Al) materials and copper (Cu) with three kinds of surface indices, namely (001), (110) and (111). From the critical indent load at the first burst, the critical resolved shear stresses (CRSSs) of the collective dislocation nucleation were estimated in reference to molecular dynamics (MD) simulations. These are almost one-tenth of the shear modulus, which are close to the ideal values. We explain the nanoplastic mechanics by a comprehensive energy balance model to describe the linear relation between the indent load and the burst width of the first displacement burst and by the nucleation model consisting of three-dimensional discrete dislocations to evaluate the number of dislocations nucleating. The distance between the emitted dislocation loops of Al is found to be fairly large. Thus, Al is expected to exhibit a less tangled network of dislocations just below the indentation than Cu, which has a lower stacking fault energy.

You might also be interested in these eBooks
Engineering Plasticity and Its Applications View Preview

Info:

Periodical:

Key Engineering Materials (Volumes 340-341)

Pages:

39-48

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.340-341.39

Citation:

Cite this paper

Online since:

June 2007

Authors:

Yoji Shibutani, Tomohito Tsuru

Keywords:

Copper (Cu), Dislocation Emission, Displacement Burst, Nanoindentation, Nanoplasticity, Prismatic Dislocation Loop, Single Crystalline Aluminium

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2007 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] S. Suresh, T. -G. Nieh and B.W. Choi: Scripta Materialia, Vol. 41 (1999), p.951.

Google Scholar

[2] A. Gouldstone, H. -J. Koh, K. -Y. Zeng, A.E. Gannakopoulos and S. Suresh: Acta mater., Vol. 48 (2000), p.2277.

Google Scholar

[3] M. Seo and M. Chiba: Electrochemica Acta, Vol. 47 (2001), p.319.

Google Scholar

[4] Y. Shibutani and A. Koyama: J. Mater. Res., Vol. 19 (2004), p.183.

Google Scholar

[5] I.N. Sneddon: Int. J. Eng. Sci., Vol. 3 (1965), p.47.

Google Scholar

[6] T. A Michalske and J. E Houston: Acta mater., Vol. 46 (1998), p.391.

Google Scholar

[7] K.J. Van Vliet, J. Li, T. Zhu, S. Yip and S. Suresh: Phys. Rev. B, Vol. 67 (2003), p.104105.

Google Scholar

[8] S.V. Dmitriev, J. Li, N. Yoshikawa and Y. Shibutani: Phil. Mag., Vol. 85 (2005), p.2177.

Google Scholar

[9] J. P Hirsh and J. Lothe: Theory of Dislocations (Krieger Publishing Company, 1982).

Google Scholar

[10] M.F. Ashby and L. Johnson: Phil. Mag., Vol. 20 (1969), p.1009.

Google Scholar

[11] Y. Shibutani and T. Tsuru: Trans. of JSME, Vol. 70 (2004), p.947 (in Japanese).

Google Scholar

[12] T. Tsuru and Y. Shibutani: Modelling and Simul. in Mat. Sci. & Eng. modeling, Vol. 14 (2006), p. S55.

Google Scholar

[13] D. Tabor: The Hardness of Metals (Oxford University Press, 1951).

Google Scholar

[14] C.B. Carter and I.L. F Ray: Philos. Mag., Vol. 35 (1977), p.189.

Google Scholar

[15] L.E. Murr: Interfacial Phenomena in Metals and Alloys (Addison-Wesley, 1975).

Google Scholar

[16] Y. Shibutani, A. Koyama and T. Tsuru, in: IUTAM Symposium on Multiscale Modeling and Characterization of elastic-Inelastic Behavior of Engineering Materials, edited by S. Ahzi, et al., p.125, Kluwer Academic Publishers (2004).

DOI: 10.1007/978-94-017-0483-0_16

Google Scholar

[17] M.C. Fivel, C.F. Robertson, G.R. Canova and L. Boulanger: Acta mater., Vol. 46 (1998), p.6183.

Google Scholar

[18] J.D. Kiely, R.Q. Hwang and J.E. Hamilton: Phys. Rev. Lett., Vol. 81 (1998), p.4422.

Google Scholar

[19] K.L. Johnson: Contact Mechanics (Cambridge University Press, 1985).

Google Scholar