Journal
MATERIALS CHARACTERIZATION
Volume 194, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2022.112495
Keywords
Refractory high entropy alloy; Yttrium alloying; Grain refinement; Mechanical property; Fracture surface
Categories
Funding
- China Postdoctoral Science Foundation
- Special Funding for the Construction of Innovative Hunan Province of China
- [2021M690384]
- [2019RS1001]
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In this study, the rare-earth element alloying strategy was used to tune the microstructure and mechanical properties of a refractory high entropy alloy. The alloying of trace Y intensified solidification segregation and drove the microstructural evolution. The experiments showed a slight beneficial effect of the alloying on the compressive strength and fracture strain.
Here we employ the rare-earth element alloying strategy for microstructure and mechanical property tuning of a TaMo0.5NbZrTi1.5Al0.1 refractory high entropy alloy (RHEA). The alloying of 0.4 at.% Y intensifies solidification segregation, with the enrichments of Zr and Al in the interdendritic region. The severer solidification segregation in the Y-alloyed RHEA drives the microstructural evolution upon annealing for the Y-alloyed RHEA, including the significant grain refinement, the removal of residual oxygen and the reduced nano-sized precipitates. However, the Y2O3 oxides and shrinkage defects are also generated in Y-alloyed RHEA. Compressive mechanical testing verifies the slight beneficial effect of the alloying of trace Y on the compressive strength (up to-1669 MPa) and fracture strain (up to-20.6%) of RHEA with an intergranular fracture mode. This work provides a primary exploration on RHEAs modified by rare-earth elements, and can be used as a reference for future alloy design.
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