Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 26, 2020
Previous Article Next Article

Tailoring phase transformation strengthening and plasticity of nanostructured high entropy alloys

Author affiliations

Abstract

Metastable high entropy alloys (HEAs) have attracted extensive attention due to their excellent combination of high strength and great plasticity. In this work, we utilize constraining effects to tailor phase transformation strengthening and plasticity of nanostructured HEA ([double bond, length as m-dash]FeCoCrNi) thin films prepared by the magnetron sputtering technique via HEA/Cu and HEA/Ni nanotwinned nanolaminates (NTNLs). It is uncovered that the HEA/Cu NTNLs without phase transformation exhibit the fashion of “smaller is stronger” and HEA layers become more favorable to detwin at a smaller layer thickness (h). By contrast, the HEA/Ni NTNLs manifest an ultra-high peak hardness plateau accompanied by the FCC-to-HCP phase transformation in HEA layers at large h ≥ 25 nm, whereas they manifest size-dependent hardness when detwinning occurs at smaller h. This unusual plastic deformation behavior of HEA/X (X = Cu, Ni) NTNLs was rationalized by partial-based mechanisms. These findings open a new avenue to achieve superior mechanical properties of HEAs particularly at the nanoscale.

Graphical abstract: Tailoring phase transformation strengthening and plasticity of nanostructured high entropy alloys

Back to tab navigation

Article information


Submitted
28 Mar 2020
Accepted
08 Jun 2020
First published
09 Jun 2020

Nanoscale, 2020,12, 14135-14149
Article type
Paper

Tailoring phase transformation strengthening and plasticity of nanostructured high entropy alloys

Y. F. Zhao, X. B. Feng, J. Y. Zhang, Y. Lu, S. H. Wu, Y. Q. Wang, K. Wu, G. Liu and J. Sun, Nanoscale, 2020, 12, 14135
DOI: 10.1039/D0NR02483J

Social activity

Search articles by author

Spotlight

Advertisements