Improved microstructure and mechanical properties of ODS-CoCrFeNiMn high entropy alloys by different Ti, Zr and Y2O3 addition
Source abstract
Abstract
Four ODS-CoCrFeNiMn high entropy alloys (HEAs) with different Ti/Zr/Y 2O 3 addition were produced by powder metallurgy. The role of Ti, Zr, Y 2O 3 on improving microstructure and mechanical properties of ODS-CoCrFeNiMn HEAs was studied. The type of nanoscale oxides is effectively changed from Y 2O 3 (1Y alloy), Y 2TiO 5, YTiO 3 and Y 2Ti 2O 7 (1YT), Y 4Zr 3O 12 and Y 2Zr 2O 7 (1YZ) to YTiO 3, Y 2TiO 5, Y 2Ti 2O 7, Ti 2O 3 (1YTZ) by introducing different addition. The joint addition of Ti, Zr and Y 2O 3 in 1YTZ has the most significant refinement on grain size and increases number density of nanoscale oxides, which reach 130 nm and 2.01 × 10 21/m 3 , respectively. The well refined grains and high density of nanoscale oxides in 1YTZ alloy lead to the highest hardness and compressive yield strength, which are 449 HV and 1309 MPa, respectively. The different formation mechanisms of nanoscale oxides due to different addition and its influence on mechanical properties in ODS-CoCrFeNiMn HEAs are disclosed.
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Research context
OpenAlex topics: High Entropy Alloys Studies · High-Temperature Coating Behaviors · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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