Abstract
In this study, NbTaTiV refractory high-entropy alloys (RHEAs) reinforced with dispersed oxides were successfully designed and fabricated by mechanical alloying and subsequent spark plasma sintering (SPS). The effects of Y2O3 content on the microstructure and mechanical properties have been systematically studied. The results show that the oxide dispersion strengthening (ODS) RHEAs are mainly composed of body centered cubic (BCC) matrix and multiscale oxides, including submicron Ti-(N, O) particles, nano-sized Y-Ti-O particles and nano-sized Y2O3 particles. The ODS-RHEAs have excellent mechanical properties due to the multiscale oxides. With the content of Y2O3 increasing from 1 wt% to 3 wt% Y2O3, the compressive yield strength of the ODS-RHEAs significantly increases from 1528 to 1866 MPa, while the fracture strain slightly reduces from 22% to 16%. The enhancement of the mechanical property is mainly attributed to the increased amount of multiscale oxide particles and the refined grain structure.
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摘要
在这项研究中, 通过机械合金化(MA)和随后的放电等离子烧结(SPS)成功设计和制造了弥散氧化物增强的NbTaTiV难熔高熵合金(RHEA)。系统研究了Y2O3含量对合金显微组织和力学性能的影响。结果表明, 氧化物弥散强化 (ODS)RHEAs主要由BCC基体和多尺度氧化物组成, 包括亚微米Ti-(N,O)颗粒、纳米Y-Ti-O颗粒和纳米Y2O3颗粒。由于多尺度氧化物的存在, ODS-RHEAs具有优异的机械性能。随着Y2O3含量从1 wt% Y2O3增加到3 wt% Y2O3, ODS-RHEA的压缩屈服强度从1528 MPa显著提高到1866 MPa, 而断裂应变从22% 略微降低到16%。力学性能的提高主要归因于多尺度氧化物颗粒数量的增加和细化的晶粒结构。
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This study was financially supported by the National Natural Science Foundation of China (Nos. 51771232 and 52104365).
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Liao, T., Cao, YK., Guo, WM. et al. Microstructure and mechanical property of NbTaTiV refractory high-entropy alloy with different Y2O3 contents. Rare Met. 41, 3504–3514 (2022). https://doi.org/10.1007/s12598-022-02038-6
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DOI: https://doi.org/10.1007/s12598-022-02038-6