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Enhanced strength and ductility of a tungsten-doped CoCrNi medium-entropy alloy

Published online by Cambridge University Press:  26 July 2018

Zhenggang Wu ,
Wei Guo ,
Ke Jin ,
Jonathan D. Poplawsky ,
Yanfei Gao  and
Hongbin Bei Open the ORCID record for Hongbin Bei [Opens in a new window]
Zhenggang Wu
Affiliation:
Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Wei Guo
Affiliation:
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Ke Jin
Affiliation:
Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Jonathan D. Poplawsky
Affiliation:
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Yanfei Gao*
Affiliation:
Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA; and Department of Materials Science & Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
Hongbin Bei*
Affiliation:
Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected] or [email protected]
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Abstract

Developing metallic materials with a good combination of strength and ductility has been an unending pursuit of materials scientists. The emergence of high/medium-entropy alloys (HEA/MEA) provided a novel strategy to achieve this. Here, we further strengthened a strong-and-ductile MEA using a traditional solid solution strengthening theory. The selection of solute elements was assisted by mechanical property and microstructure predictive models. Extensive microstructural characterizations and mechanical tests were performed to verify the models and to understand the mechanical behavior and deformation mechanisms of the designated CoCrNi–3W alloy. Our results show good experiment-model agreement. The incorporation of 3 at.% W into the ternary CoCrNi matrix increased its intrinsic strength by ∼20%. External strengthening through microstructural refinement led to a yield strength nearly double that of the parent alloy, CoCrNi. The increase in strength is obtained with still good ductility when tested down to 77 K. Nanoscale twin boundaries are observed in the post-fracture microstructure under 77 K. The combination of strength and ductility after W additions deviate from the traditional strength-ductility-trade-off contour.

Keywords

solid solution alloyhigh-entropy alloystrengthmicrostructurestrengthening mechanism
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 19: Focus Issue: Fundamental Understanding and Applications of High-Entropy Alloys , 14 October 2018 , pp. 3301 - 3309
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

c)

These authors contributed equally to this work.

References

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