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Title: Deformation behavior of a Co-Cr-Fe-Ni-Mo medium-entropy alloy at extremely low temperatures

Journal Article · · Materials Today
 [1];  [2];  [2];  [2];  [3];  [4];  [4];  [5];  [5];  [1];  [6];  [1];  [1];  [1]
  1. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
  2. National Academy of Sciences of Ukraine (NASU), Kharkov (Ukraine)
  3. Monash Univ., Melbourne, VIC (Australia); Univ. of Western Australia, Perth, WA (Australia)
  4. Univ. of Tennessee, Knoxville, TN (United States)
  5. Univ. of Illinois at Urbana-Champaign, IL (United States)
  6. Max Planck Inst. for Iron Research, Düsseldorf (Germany)

In this work, we report the mechanical and microstructural characteristics of a medium-entropy alloy, Co17.5Cr12.5Fe55Ni10Mo5 (atomic percent, at%) at cryogenic temperatures, down to a record low temperature of 0.5 K. The alloy exhibits excellent strength and ductility combined with a high strain-hardening rate in the entire temperature range investigated. Its property profile, including the yield strength, ultimate tensile strength, strain hardening capability, and absorbed mechanical energy, is better than those of most alloys and HEAs used in cryogenics. Within the interval of extremely low temperatures considered (0.5–4.2 K), the alloy exhibits several unusual features, including anomalies of the temperature dependence of the yield strength and tensile ductility, discontinuous plastic deformation (DPF), and a change in the propensity for the deformation-induced martensitic transformation. While the occurrence of these effects in the same temperature interval may be fortuitous, we hypothesize that they are interrelated and provide a tentative explanation of the observed phenomena on this basis.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; US Army Research Office (ARO); National Research Foundation of Korea (NRF); National Science Foundation (NSF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1843667
Journal Information:
Materials Today, Journal Name: Materials Today Journal Issue: 1 Vol. 50; ISSN 1369-7021
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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