Wear-resistance enhancement of nanostructured W-Cu-Cr composites

Lijun Cao, Chao Hou, Fawei Tang, Tielong Han, Xintao Huang, Yurong Li, Gaochao Wu, Chao Liu, Shuhua Liang, Junhua Luan, Zengbao Jiao, Zuoren Nie, Xiaoyan Song

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Nanostructured W-Cu-Cr composites were fabricated, which exhibit exceptionally high hardness (~1000 HV) as compared with those of the conventional W-Cu composites, due to the combined advantages of Cr dissolution, precipitate formation and grain refinement. Nonmonotonic variation of the wear resistance with hardness was discovered. With an appropriate content of Cr, the preferential oxidation reduced the oxidation of W. Moreover, it facilitated formation of a stable protective film with fish-scale morphology and also refined the structure, leading to a high microhardness at the worn surface. The wear rate (1.65 × 10−6 mm3 N−1 m−1) was reduced by an order of magnitude compared with that of the conventional counterpart. However, excessive addition of Cr may deteriorate the wear resistance in spite of a higher hardness due to the embrittlening of W phase and difficulty to form a stable protective film at the worn surface. This study provides a new strategy for developing W-Cu composites with outstanding wear resistance.

Original languageEnglish
Article number105673
JournalInternational Journal of Refractory Metals and Hard Materials
Volume101
DOIs
Publication statusPublished - Dec 2021

Keywords

  • Hardness
  • Nanostructure
  • W-Cu based composite
  • Wear resistance

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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