Mechanical & Materials Engineering, Department of

 

Document Type

Article

Date of this Version

2019

Citation

Published in Philosophical Magazine, 2019

doi 10.1080/14786435.2019.1569768

Comments

Copyright © 2019 Informa UK Limited, trading as Taylor & Francis Group. Used by permission.

Abstract

Solute segregation at dislocations can impede the motion of dislocations, strengthening materials. Here, we study the formation and role of solute segregation at dislocations in CrFeCoNiMo high-entropy alloys (HEAs) by high-angle annular dark-field scanning transmission electron microscopy imaging and mechanical testing both deformed and annealed samples. Mo atoms exhibit pronounced segregation into the planar-extended core of dislocations, i.e. stacking faults, causing the increase in the yield strength while the loss of the ductility. This work suggests that mechanical properties of HEAs can be tailored by alloying additional elements that are in favor of segregation into dislocations.

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