Microstructure and Mechanical Properties of Novel Lightweight TaNbVTi-Based Refractory High Entropy Alloys |
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| Authors: | Ao Fu Yuankui Cao Yuxi Liu Shenghang Xu |
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| Affiliation: | 1.State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; (A.F.); (Y.L.);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; |
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| 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. |
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| Keywords: | refractory high entropy alloy microstructure powder metallurgy sintering mechanical property |
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