Solidification segregation-driven microstructural evolution of trace yttrium-alloyed TaMoNbZrTiAl refractory high entropy alloys

Guo，Yueling1,2; He，Junyang2,3; Li，Zhiming2,3; Wu，Xiaoxiang2,4; Lu，Wenjun2,5; Liu，Changmeng1

2022-12-01

10.1016/j.matchar.2022.112495

MATERIALS CHARACTERIZATION   Impact Factor & Quartile

1044-5803

1873-4189

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.

Fracture surface Grain refinement Mechanical property Refractory high entropy alloy Yttrium alloying

SCI

English

Corresponding

China Postdoctoral Science Foundation[2021M690384];

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing

WOS:000891301400003

ELSEVIER SCIENCE INC

MATERIALS SCIENCE

2-s2.0-85142150316

Scopus

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

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).