Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7971611 | Materials Science and Engineering: A | 2018 | 23 Pages |
Abstract
Creep tests of two equiatomic CoCrFeMnNi alloys were conducted in the temperature range from 973â¯K to 1073â¯K. The alloys were prepared by milling blends of powders of pure elements in a planetary ball mill and compacting by the spark plasma technique. Two variants of the alloys were prepared: (i) without and (ii) with the dispersion of oxides. Creep resistance was substantially improved by the presence of oxides. Diffusion creep controlled by lattice diffusion was suggested as a possible mechanism at low stresses. The effective diffusion coefficient calculated for Nabarro-Herring creep was comparable to the lattice diffusion coefficient of Ni in the same high-entropy alloy. At high stresses, the creep behavior was characterized by the presence of a threshold stress invoked by oxide particles.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Ferdinand DobeÅ¡, Hynek Hadraba, ZdenÄk Chlup, AntonÃn Dlouhý, Monika Vilémová, JiÅà MatÄjÃÄek,