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Journal of Iron and Steel Research International

, Volume 26, Issue 11, pp 1240–1248 | Cite as

Nanoscratching and mechanical behaviors of high-entropy alloys with different phase constituents

  • Jiang-li NingEmail author
  • Yun-li Feng
  • Xu-dong Li
  • Qi-bo DengEmail author
  • Yong-jiang Huang
Original Paper
  • 39 Downloads

Abstract

High-entropy alloys (HEAs) exhibit unique microstructural features and properties in nanoscale and atomic scale because of their multi-element alloy system. The nanoscratching behaviors of three HEAs with different phase constituents, relative to the microstructure and mechanical properties of the HEAs, were investigated. Three typical phase constituents were selected: face-centered cubic (FCC) structure, body-centered cubic (BCC) structure, and a dual-phase structure containing both FCC and BCC phases. Despite the fact that the FCC alloy has the highest ductility and strain hardening capability, it exhibited inferior scratch resistance due to the over-softening of hardness. Due to the brittle failure mode, the BCC alloy hardly exhibited desirable scratch resistance despite its highest hardness. By contrast, the nanostructured dual-phase alloy exhibited the best scratch resistance because of its good combination of strength and ductility, as well as the ductile failure mode. This research suggests that the HEA with structure comprising nanoscale hard and soft phases is desirable for nanoscratch resistance, and possesses appropriate hardness for industrial applications.

Keywords

High-entropy alloy Nanoscratch Mechanical property Microstructure Failure mode 

Notes

Acknowledgements

The authors are grateful for the financial supports from the Defense Industrial Technology Development Program (No. JCKY2018407C008), the National Natural Science Foundation of China (NSFC) (Grant Nos. 51304061 and 51474092), and the NCST Science Fund for Distinguished Young Scholars (No. JQ201702).

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Copyright information

© China Iron and Steel Research Institute Group 2019

Authors and Affiliations

  1. 1.College of Metallurgy and EnergyNorth China University of Science and TechnologyTangshanChina
  2. 2.Tianjin Key Laboratory of Advanced Functional Porous Materials, Institute for New Energy Materials and Low-Carbon Technologies, School of Materials Science and EngineeringTianjin University of TechnologyTianjinChina
  3. 3.School of Materials Science and EngineeringHarbin Institute of TechnologyHarbinChina

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