The effects of Y pre-alloying on the in-situ dispersoids of ODS CoCrFeMnNi high-entropy alloy
作者： Soo Yeol Lee , Ho Jin Ryu , Bin Lee , SeungHyeok Chung , Changwoo Do
DOI: 10.1016/J.JMST.2020.11.081
关键词:
摘要: Abstract Oxide dispersion strengthened CoCrFeMnNi high-entropy alloys (ODS-HEAs) were prepared using two different powder preparation methods classified by yttrium addition strategy to investigate the effects of in-situ and ex-situ oxide dispersoid formation on microstructure mechanical properties. Systematic microstructural analysis was carried out X-ray diffraction (XRD), electron backscattered (EBSD), high-resolution transmission microscopy (HRTEM), atom probe tomography (APT), small-angle neutron scattering (SANS). Cryo-milled analysis, grain structure evolution after spark plasma sintering, characteristics, matrix/dispersoid interface dispersoids within alloy (HEA) matrix performed. The dominantly observed in Y-alloyed ODS-HEA through construction a coherent relationship with complex chemical composition, leading an increase Zener pinning forces boundary movement. enhanced ultrafine-grained structures average diameter 330 nm at sintering temperature 1173 K. This study shows that Y pre-alloying method is efficient achieving fine structure, resulting enhancement tensile strength HEA.
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