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Crystal plasticity FEM study of nanoindentation behaviors of Cu bicrystals and Cu–Al bicrystals

Published online by Cambridge University Press:  17 August 2015

Mao Liu ,
Cheng Lu ,
Kiet Anh Tieu  and
Kun Zhou
Mao Liu*
Affiliation:
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia
Cheng Lu
Affiliation:
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia
Kiet Anh Tieu
Affiliation:
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia
Kun Zhou*
Affiliation:
School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
*
a)Address all correspondence to these authors. e-mail: ml818@uowmail.edu.au
b)e-mail: kzhou@ntu.edu.sg
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Abstract

A crystal plasticity finite element constitutive model combined with Bassani and Wu hardening law has been developed to investigate the effects of grain/phase boundary (GB/PB) on mechanical properties and microtexture evolution of Cu bicrystals and Cu–Al bicrystals during nanoindentation process. The simulated load–displacement curve for the Cu single crystal with Goss initial orientation has been analyzed and compared with the result from the experiment to validate the parameters. The numerical results indicate that the effects of GB/PB on load–displacement curves, indentation Young's moduli, Mises stresses, pile-up patterns are insignificant for Cu bicrystals while they are significant for Cu–Al bicrystals. The main reason is that PB works as a very effective barrier to resist the plastic slip propagation of the deformed material. The effects from different misorientations of GBs/PBs are insignificant for both Cu bicrystals and Cu–Al bicrystals. The effects of GB/PB on lattice rotation angles for both Cu bicrystals and Cu–Al bicrystals are significant.

Keywords

finite element crystal plasticitynanoindentationgrain/phase boundaryCu–Al bicrystalsmicrotexture
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 16 , 28 August 2015 , pp. 2485 - 2499
Copyright
Copyright © Materials Research Society 2015 

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References

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