Excellent high cyclic fatigue properties of a novel ultrafine-grained medium entropy alloy

Shukla, Shivakant; Mishra, Rajiv S.

doi:10.1016/j.msea.2020.139122

Excellent high cyclic fatigue properties of a novel ultrafine-grained medium entropy alloy

Journal Article · Mon Feb 17 23:00:00 EST 2020 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2020.139122· OSTI ID:1809963

^[1]; Mishra, Rajiv S. ^[2]

Univ. of North Texas, Denton, TX (United States). Dept. of Materials Science and Engineering; Univ. of North Texas, Denton, TX (United States). Advance Materials and Manufacturing Processes Institute (AMMPI); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of North Texas, Denton, TX (United States). Dept. of Materials Science and Engineering; Univ. of North Texas, Denton, TX (United States). Advance Materials and Manufacturing Processes Institute (AMMPI)

Fatigue is a major cause of failure and requires dedicated investigation to validate the integrity of potential structural materials. As high and medium entropy alloys (HEAs and MEAs) are garnering significant attention from scientific communities, it is important to test the structural integrity of these novel alloys in cyclic loading environment. This study analyzed both monotonic and cyclic loading properties of a novel medium entropy alloy (MEA) CoCr_1.3Ni in the ultrafine-grained (UFG) and fine grain (FG) conditions. The UFG MEA performs better than the FG MEA during cyclic loading. Microstructural evolution after cyclic loading via electron back-scattered diffraction shows microstructural stability of both FG and UFG microstructures. Transmission electron microscopy suggests formation of stacking faults and fine-scale HCP transformation during cyclic loading.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1809963

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: 779 Vol. 779; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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