Microstructure and morphology of electrodeposited Ni-P alloys treated by high energy surface mechanical attrition

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Abstract

Fully amorphous Ni-P layer electrodeposited onto a Cu plate was subjected to severe plastic deformation using surface mechanical attrition treatment in a high energy SPEX 8000 shaker mill. Two series of experiments using different milling conditions (series I: 20 6.35-mm balls; series II: 100 1.59-mm balls) were carried out to explore the mechanism of the process and to investigate the structure of the developed coatings. The evolution of the microstructure and mechanical properties of the Ni-P layer after the deformation process was studied by x-ray diffraction, scanning electronmicroscopy and hardness measurements. We demonstrate that the different mechanical treatments controllably influence the mechanical behavior of the Ni-P metallic glass coating. When the vial of the mill is loaded with larger balls, deformation-induced Ni3P compound particles form in the amorphous matrix resulting in a hard (HV = 17 GPa) but non-uniform coating. In the case of milling with many small balls, the increase in the surface hardness is considerably lower (7 GPa) as a consequence of reduced impact energy.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalCurrent Applied Physics
Volume12
Issue number1
DOIs
Publication statusPublished - Jan 1 2012

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Keywords

  • Abrasion
  • Coatings
  • Hardness
  • Surface properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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