Microstructure and mechanical properties of FeCoNiCr high-entropy alloy strengthened by nano-Y2O3 dispersion
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In this manuscript, the FeCrCoNi high entropy alloy strengthened by nano-Y2O3 particles was synthesized via mechanical alloying and spark plasma sintering. Effects of Y2O3 additions on the microstructure and mechanical properties were investigated. The oxide-dispersion-strengthened (ODS) high-entropy alloy bearing 5wt% Y2O3 was found to have a finer grain with respect to the single-phase face-centered cubic (FCC) alloy without oxides. Consequently, the yield strength increased from 654 to 1754 MPa, and the fracture strength reached up to 2325 MPa while the plasticity decreased appreciably for the ODS high-entropy alloy. The synergic effects of grain size hardening and particle strengthening on mechanical properties of the ODS HEA were discussed. This finding indicates that the addition of nano-scaled oxides is an effective and feasible approach to designing HEAs with superior mechanical properties.
Keywordshigh entropy alloy oxide dispersion strengthening mechanical alloying microstructure mechanical property
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