Influence of multi directional forging-induced grain refinement and subsequent aging on tribological performance of Cu-Ni-Si-Cr alloys in electrical contact sliding conditions

YANAR H., COŞKUN A.

WEAR, cilt.574-575, 2025 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 574-575
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.wear.2025.206100
  • Dergi Adı: WEAR
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, Index Islamicus, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: Arc-induced wear, CuNiSi alloy, Electrical contact sliding, Ultrafine-grained materials
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

This study examines the effect of deformation-induced grain refinement on the tribological behavior of CuNi2SiCr alloys under electrical current-carrying contact conditions of 0A, 5A, 15A, and 25A. The results demonstrate that the formation of an ultrafine-grained (UFG) structure in the matrix enhanced the wear resistance of the alloy in all test conditions. The improvement in wear resistance is more pronounced under electrical contact sliding conditions. With the formation of the UFG structure, the wear volume loss decreased by 18 % compared to the coarse-grained (CG) sample under currentless conditions. The decrease seen in volumetric loss is achieved as 27 %, 42 %, and 67 % for conditions of 5A, 15A, and 25A, respectively. Additionally, as the intensity of electric current increases, the average friction coefficient value of the samples rises, exhibiting significant fluctuations during the steady-state period of rubbing with increasing electric current intensity. Furthermore, the dominant wear mechanism depends on the level of electrical current intensity. While adhesive, abrasive, and oxidative wear mechanisms are operative for coarse (CG) and UFGed CuNi2SiCr samples at low-intensity electrical current conditions, arc-induced erosion, oxidative, and severe abrasive-based wear are more active at higher current intensities for both samples.