Paper Title:
Nanoindentation-Induced Collective Dislocation Behavior and Nanoplasticity
  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.

  Info
Periodical
Key Engineering Materials (Volumes 340-341)
Edited by
N. Ohno and T. Uehara
Pages
39-48
DOI
10.4028/www.scientific.net/KEM.340-341.39
Citation
Y. Shibutani, T. Tsuru, "Nanoindentation-Induced Collective Dislocation Behavior and Nanoplasticity", Key Engineering Materials, Vols. 340-341, pp. 39-48, 2007
Online since
June 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Sukky Jun, Young Min Lee, Sung Youb Kim, Se Young Im
Abstract:Molecular dynamics simulation of nanoindentation on Al(111) surface is presented. The simulation is performed using the Ercolessi-Adams glue...
735
Authors: Xiao Chun Ma, Ji Hui Yin
Abstract:The thermal effect has pronounced influence on deformation behavior of materials at nanoscale due to small length scale. In current paper,...
155
Authors: Shinji Muraishi, Masaaki Takaya
Chapter 23: Thin Films & Interface Engineering
Abstract:The size dependent hardening in Al-4wt%Cu thin film on Si substrate has been investigated by the numerical calculation of indentation stress...
2892
Authors: Karri V. Mani Krishna, Prita Pant
Abstract:Dislocation Dynamics (DD) simulations are used to study the evolution of a pre-specified dislocation structure under applied stresses and...
13
Authors: Hong Xiu Zhou, Ming Lei Li, Neng Dong Duan, Bo Wang, Zhi Feng Shi, Ji Lei Lyu, Guo Xin Chen
Chapter 9: Surface Integrity and Materials Characterization
Abstract:A nanotwinned surface is formed on a titanium alloy under nanoindentations. Prior to nanoindentation, blocks of a ternary titanium alloy are...
323