Cantor-derived medium-entropy alloys: bridging the gap between traditional metallic and high-entropy alloys

Garcia Filho, Fabio da Costa; Ritchie, Robert O.; Meyers, Marc André; Monteiro, Sergio Neves

doi:10.1016/j.jmrt.2022.01.118

Cantor-derived medium-entropy alloys: bridging the gap between traditional metallic and high-entropy alloys

Journal Article · Tue Feb 01 00:00:00 EST 2022 · Journal of Materials Research and Technology

DOI:https://doi.org/10.1016/j.jmrt.2022.01.118· OSTI ID:1885459

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Military Institute of Engineering, Rio de Janeiro, RJ (Brazil); Univ. of California, San Diego, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Univ. of California, San Diego, CA (United States)
Military Institute of Engineering, Rio de Janeiro, RJ (Brazil)

The year 2004 marked the beginning of a new era in the design of metallic materials, as the concept of multiple principal component alloys, commonly known as High-Entropy Alloys (HEAs), was proposed by Cantor and Yeh. The unexpected single-phase microstructure, instead of the expected brittle intermetallic compounds, was attributed to the large entropy of mixing and immediately caught the attention of the scientific community. Today, HEAs are considered important advanced materials and a broad range of alloys using nominally the same design principle have been investigated. Despite that, the CrMnFeCoNi (Cantor) alloy stands out as the most successful HEA due to its outstanding mechanical properties and microstructure. In this scenario, variants of the Cantor alloy, named medium-entropy alloys (MEAs), are gaining significant interest as they display a better industrial potential than both HEAs and traditional alloys. These variants of the Cantor alloy with only three or four main elements result in 15 possible combinations. The microstructure of these alloys is discussed in terms of advanced characterization as well as thermodynamic parameters and computational simulation. Their phase stability is addressed over a wide range of temperatures and strain rates. The mechanical properties, especially the fracture toughness, of the CrFeCoNi and CrCoNi alloys have been reported to be even superior to those of the Cantor alloy and most modern engineering alloys. This is associated with the formation of a continuous sequence of strengthening mechanisms, including hierarchical twin networks, which serve to prolong the strain hardening. The present article reviews and critically assesses, for the first time, recent advances in these Cantor-derived MEAs.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Coordination for the Improvement of Higher Education Personnel (CAPES); FAPERJ; National Council for Scientific and Technological Development (CNPq); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231; NA0003842

OSTI ID:: 1885459

Journal Information:: Journal of Materials Research and Technology, Journal Name: Journal of Materials Research and Technology Vol. 17; ISSN 2238-7854

Publisher:: Brazilian Metallurgical, Materials and Mining AssociationCopyright Statement

Country of Publication:: United States

Language:: English

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