Metallurgical and Materials Transactions A

, Volume 48, Issue 4, pp 2051–2061 | Cite as

Indentation Pileup Behavior of Ti-6Al-4V Alloy: Experiments and Nonlocal Crystal Plasticity Finite Element Simulations

  • Fengbo Han
  • Bin Tang
  • Xu Yan
  • Yifei Peng
  • Hongchao Kou
  • Jinshan Li
  • Ying Deng
  • Yong Feng


This study reports on the indentation pileup behavior of Ti-6Al-4V alloy. Berkovich nanoindentation was performed on a specimen with equiaxed microstructure. The indented area was characterized by electron backscattered diffraction (EBSD) to obtain the indented grain orientations. Surface topographies of several indents were measured by atomic force microscopy (AFM). The pileup patterns on the indented surfaces show significant orientation dependence. Corresponding nonlocal crystal plasticity finite element (CPFE) simulations were carried out to predict the pileup patterns. Analysis of the cumulative shear strain distributions and evolutions for different slip systems around the indents found that the pileups are mainly caused by prismatic slip. The pileup patterns evolve with the loading and unloading process, and the change in pileup height due to the elastic recovery at unloading stage is significant. The density distributions of geometrically necessary dislocations (GNDs) around the indent were predicted. Simulation of nanoindentation on a tricrystal model was performed.


Slip System Critical Resolve Shear Stress Prismatic Slip Berkovich Indenter Grid Orientation 
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This work was financially supported by the Natural Science Foundation of Shaanxi Province (2014JQ6216), the Fundamental Research Funds for the Central Universities in China (3102015BJ(II)JGZ005), the “111” Project (No. B08040), and the “Gao Feng” project for undergraduate.


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2017

Authors and Affiliations

  • Fengbo Han
    • 1
  • Bin Tang
    • 1
  • Xu Yan
    • 1
  • Yifei Peng
    • 1
  • Hongchao Kou
    • 1
  • Jinshan Li
    • 1
  • Ying Deng
    • 2
  • Yong Feng
    • 1
  1. 1.State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’anP.R. China
  2. 2.Beijing Aeronautical Manufacturing Technology Research InstituteBeijingP.R. China

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