• Alman, David E.
• Zhao, Shiteng
• Detrois, Martin
• Hawk, Jeffrey A.
• Jablonski, Paul D.
• Gao, Michael
• Minor, Andrew
• Asta, Mark

Abstract

<jats:title>Abstract</jats:title><jats:p>Metallic alloys have played essential roles in human civilization due to their balanced strength and ductility. Metastable phases and twins have been introduced to overcome the strength-ductility tradeoff in face-centered cubic (FCC) high-entropy alloys (HEAs). However, there is still a lack of quantifiable mechanisms to predict good combinations of the two mechanical properties. Here we propose a possible mechanism based on the parameter κ, the ratio of short-ranged interactions between closed-pack planes. It promotes the formation of various nanoscale stacking sequences and enhances the work-hardening ability of the alloys. Guided by the theory, we successfully designed HEAs with enhanced strength and ductility compared with other extensively studied CoCrNi-based systems. Our results not only offer a physical picture of the strengthening effects but can also be used as a practical design principle to enhance the strength-ductility synergy in HEAs.</jats:p>

Topics

• impedance spectroscopy
• theory
• strength
• ductility
• metastable phase