Microstructures and mechanical properties of CoCrFeMnNiVx high entropy alloy films

Shuang Fang, Cheng Wang, Chia Lin Li, Jun Hua Luan, Zeng Bao Jiao, Chain Tsuan Liu, Chun Hway Hsueh

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)

Abstract

In the present work, CoCrFeMnNiVx (x = 0, 0.07, 0.3, 0.7, 1.1) high entropy alloy films were fabricated by magnetron co-sputtering. For low contents of V, typical face-centered cubic (fcc) peaks were identified in X-ray diffraction patterns. With the increasing V content, the diffraction peaks became broadened and the formation of an amorphous phase was promoted. TEM observations showed abundant nanotwins in the films with low V contents and the transition from fcc to the amorphous structure with the increasing V content. Mechanical properties of the films were studied using nanoindentation and micro-pillar compression tests. The films exhibited a high hardness ranging from 6.8 to 8.7 GPa. The serrated flow associated with shear banding showed in the stress-strain curves for films with x ≥ 0.3. When x = 0.07, the excellent yield strength of 3.79 GPa and ultimate compressive strength of 4.93 GPa were achieved with little sacrifice in ductility. The presence of nanotwins contributed to the strain hardening effect.

Original languageEnglish
Article number153388
JournalJournal of Alloys and Compounds
Volume820
DOIs
Publication statusPublished - 15 Apr 2020

Keywords

  • Entropy
  • Mechanical properties
  • Microstructure
  • Nanostructured materials
  • Thin films

ASJC Scopus subject areas

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

Cite this