Microstructure and mechanical property of NbTaTiV refractory high-entropy alloy with different Y2O3 contents
Microstructure and mechanical property of NbTaTiV refractory high-entropy alloy with different Y2O3 contents
复制标题
不同Y2O3含量NbTaTiV难熔高熵合金的显微组织与力学性能
DOI：
10.1007/s12598-022-02038-6
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发表时间：
2022-07-20
期刊：
影响因子：
8.8
通讯作者：
Liu, Bin
中科院分区：
文献类型：
--
作者：
Liao, Tao;Cao, Yuan-Kui;Liu, Bin
在这项研究中，NbTaTiV耐火高熵合金（RHEAs）的分散氧化物增强成功地设计和制造的机械合金化和随后的放电等离子烧结（SPS）。系统研究了Y2 O3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主要由体心立方（BCC）基体和多尺度氧化物组成，包括亚微米级Ti-（N，O）颗粒、纳米级Y-Ti-O颗粒和纳米级Y2 O3颗粒。由于多尺度氧化物的存在，ODS-RHEAs具有优异的力学性能。随着Y2 O3含量从1wt%增加到3wt%，ODS-RHEAs的压缩屈服强度从1528显著增加到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晶粒组织的细化。
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 sub-micron 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.