Metallurgical and Materials Transactions A

, Volume 37, Issue 10, pp 2939–2945 | Cite as

Mechanical properties and deformation behavior of amorphous nickel-phosphorous films measured by nanoindentation test

  • Shou-Yi Chang
  • Yu-Shuien Lee
  • Hsiang-Long Hsiao
  • Ting-Kui Chang


In this study, amorphous Ni-P films were deposited by electroless plating under different pH values. Their mechanical properties and deformation behavior were then investigated by instrumented nano-indentation. With increasing pH value of the plating solution from 3.75 to 6.0, the hardness and elastic modulus of the obtained Ni-P films increased from 6.1 GPa and 146 GPa to 8.2 GPa and 168 GPa respectively. From the load-indentation depth curve, the Ni-P films were found to yield at an indentation depth of 8 nm. By microstructural examination around the indented regions, early-stage plastic deformation of the amorphous Ni-P films was verified through the formation and extension of shear bands with a spacing of several tens of nanometers. Within the shear bands, flow dilatation-induced intense shear localization was expected and resulted in crystallization in the amorphous matrix. The critical shear stress and energy release rate required for the initiation of early-stage plastic yielding of the Ni-P films were calculated to be about 1.4 GPa and 3.0 J/m2 respectively, both of which increased with pH values.


Material Transaction Shear Band Energy Release Rate Indentation Depth Critical Shear Stress 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2006

Authors and Affiliations

  • Shou-Yi Chang
    • 1
  • Yu-Shuien Lee
    • 1
  • Hsiang-Long Hsiao
    • 1
  • Ting-Kui Chang
    • 1
  1. 1.Department of Materials EngineeringNational Chung Hsing UniversityTaichungTaiwan, Republic of China

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