Microstructure and Mechanical Properties of Novel Lightweight TaNbVTi-Based Refractory High Entropy Alloys

Ao Fu; Yuankui Cao; Yuxi Liu; Shenghang Xu

doi:10.3390/ma15010355

Microstructure and Mechanical Properties of Novel Lightweight TaNbVTi-Based Refractory High Entropy Alloys

Materials (Basel). 2022 Jan 4;15(1):355. doi: 10.3390/ma15010355.

Authors

Ao Fu^{1

2}, Yuankui Cao¹, Yuxi Liu¹, Shenghang Xu³

Affiliations

¹ State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
² Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310023, China.
³ College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

Abstract

A series of novel lightweight TaNbVTi-based refractory high entropy alloys (RHEA) were fabricated through ball-milling and spark plasma sintering (SPS). The reinforced phase of TiO precipitates were in-situ formed due to the introduction of Al₂O₃ ceramic particles. The RHEA with 15% Al₂O₃ exhibits a high compressive yield strength (1837 MPa) and a low density (7.75 g/cm³) with an adequate ductility retention. The yield strength and density are 32% higher and 15% lower, respectively, compared to the RHEA without Al₂O₃ addition. The specific yield strength (237 MPa cm³/g) of the RHEAs is much higher than that of other reported RHEAs, and is mainly ascribed to the introduction of high volume fraction of Al₂O₃ additives, resulting in solid solution strengthening and precipitation strengthening. Meanwhile, the ductile matrix is responsible for the good compressive plasticity.

Keywords: mechanical property; microstructure; powder metallurgy; refractory high entropy alloy; sintering.

Abstract

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