Nanomechanical and tribological properties of nickel-chromium multilayer coating on Inconel 617 Academic Article uri icon

abstract

  • Multilayer coatings of Ni and Cr were deposited onto Inconel 617, and multi-scale physical properties were characterized using high temperature tribological experiments, nanoindentation, and microscratch. The effect of high temperature aging (950C under helium environment) on two different Ni/Cr multilayer coatings with individual layer thicknesses of 50 and 200nm denoted by Ni/Cr(50) and Ni/Cr(200) was investigated. Nanoindentation of original coatings showed a hardness of 6GPa that increases to 14GPa for both samples once aged. Microscratch results support the macro-tribology results where Ni/Cr(50) (without aging) was the only delaminated coating with significant wear. Additionally, aging in both cases reduced the in situ coefficient of friction and wear. Cross-section energy dispersive spectrometry confirmed that the aged oxide layer was two to three times thicker than the original coating. An abundance of chromium oxide was found in the main body of the coatings, which led to higher hardness and better wear resistance.

published proceedings

  • JOURNAL OF APPLIED PHYSICS

author list (cited authors)

  • Asif, A., Rahman, S., & Polycarpou, A. A.

citation count

  • 1

complete list of authors

  • Asif, Ayesha||Rahman, Saifur||Polycarpou, Andreas A

publication date

  • September 2022