Superior tensile creep behavior of a novel oxide dispersion strengthened CrCoNi multi-principal element alloy
Source abstract
Abstract
The creep behavior of an additively manufactured (AM) yttrium oxide dispersion strengthened (ODS) CrCoNi multi-principal element alloy (MPEA) is investigated in this study. Tests were conducted over a constant tensile stress range of 40-200 MPa and a temperature range of 973-1173 K. A stress exponent of 6.5 ± 0.1 and activation energies in the range of 335-367 kJ/mol were measured. Compared to its non-ODS counterpart and its parent alloy (CrMnFeCoNi), AM ODS CrCoNi has superior creep resistance at all tested stresses and temperatures. The mechanisms contributing to the excellent creep resistance of AM ODS CrCoNi is attributed to the interaction of mixed character dislocations with oxide particles. The creep ductility of AM ODS CrCoNi is higher than its non-ODS counterpart due to a large percentage of low angle grain boundaries associated with its columnar grain structure. It was also found that creep ductility is significantly greater at the highest applied stress of 200 MPa compared to lower stresses. The steady state dislocation structure of AM ODS CrCoNi consists of long arrays of dislocations which is different than that observed in non-ODS CrCoNi which consists of individual curved dislocations.
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Research context
OpenAlex topics: High Entropy Alloys Studies · Advanced materials and composites · Additive Manufacturing Materials and Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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