Solidification segregation-driven microstructural evolution of trace yttrium-alloyed TaMoNbZrTiAl refractory high entropy alloys
Here we employ the rare-earth element alloying strategy for microstructure and mechanical property tuning of a TaMoNbZrTiAl 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 YO 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.
China Postdoctoral Science Foundation[2021M690384];
|WOS Research Area|
Materials Science ; Metallurgy & Metallurgical Engineering
Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
|WOS Accession No|
|ESI Research Field|
Cited Times [WOS]:0
|Document Type||Journal Article|
|Department||Department of Mechanical and Energy Engineering|
1.School of Mechanical Engineering,Beijing Institute of Technology,Beijing,100081,China
2.Max-Planck-Institut für Eisenforschung,Düsseldorf,Max-Planck-Straße 1,40237,Germany
3.State Key Laboratory of Powder Metallurgy,School of Materials Science and engineering,Central South University,Changsha,410083,China
4.School of Iron and Steel,Soochow University,Suzhou,215137,China
5.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
|Corresponding Author Affilication||Department of Mechanical and Energy Engineering|
Guo，Yueling,He，Junyang,Li，Zhiming,et al. Solidification segregation-driven microstructural evolution of trace yttrium-alloyed TaMoNbZrTiAl refractory high entropy alloys[J]. MATERIALS CHARACTERIZATION,2022,194.
Guo，Yueling,He，Junyang,Li，Zhiming,Wu，Xiaoxiang,Lu，Wenjun,&Liu，Changmeng.(2022).Solidification segregation-driven microstructural evolution of trace yttrium-alloyed TaMoNbZrTiAl refractory high entropy alloys.MATERIALS CHARACTERIZATION,194.
Guo，Yueling,et al."Solidification segregation-driven microstructural evolution of trace yttrium-alloyed TaMoNbZrTiAl refractory high entropy alloys".MATERIALS CHARACTERIZATION 194(2022).
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