Effects of Boron on the Microstructure and Mechanical Properties of NbMoTiVSi<sub>0.2</sub> Refractory High Entropy Alloys

Xu Qin; Wang Qi; Li Juan; Zeng Ping; Fan Tanhao; Yin Yajun; Chen Ruirun

doi:10.15980/j.tzzz.2022.03.005

Views : 0 下载量: 183 CSCD: 0

PDF
Export
Share
Collection
Album

Effects of Boron on the Microstructure and Mechanical Properties of NbMoTiVSi_0.2 Refractory High Entropy Alloys
Vol. 42, Issue 3, Pages: 292-296(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.03.005

扫描看全文

Xu Qin, Wang Qi, Li Juan, et al. Effects of Boron on the Microstructure and Mechanical Properties of NbMoTiVSi_0.2 Refractory High Entropy Alloys. [J]. Special Casting & Nonferrous Alloys 42(3):292-296(2022)
DOI：

Xu Qin, Wang Qi, Li Juan, et al. Effects of Boron on the Microstructure and Mechanical Properties of NbMoTiVSi_0.2 Refractory High Entropy Alloys. [J]. Special Casting & Nonferrous Alloys 42(3):292-296(2022) DOI： 10.15980/j.tzzz.2022.03.005.

摘要

制备了不同B含量的(NbMoTiVSi

0.2

)

100-x

难熔高熵合金铸锭，研究了合金的相组成、微观组织和力学性能。结果表明，添加B后，合金的相组成无变化，均由BCC相和硅化物相组成，且在晶界形成由两相组成的共晶组织。随B含量增加，合金的树枝晶和共晶组织得到细化，组织形态由树枝晶向近等轴晶转变。随B含量增加，合金的屈服强度从1 766 MPa提高到2 076 MPa

极限压缩强度从2 091 MPa提高到2 270 MPa

断裂应变由16.47%下降到13.33%。细晶强化和固溶强化共同提高了合金的强度，而晶粒细化引起的塑性提高无法抵消固溶强化导致的塑性降低，因此，合金的塑性随B含量的增加而降低。

Abstract

(NbMoTiVSi

0.2

)

100-x

refractory high entropy alloy ingots with different addition of boron were prepared

and the phase constitution

microstructure and mechanical properties of the alloy were investigated. The results indicate that phase constitution of alloys remains stable after boron addition

which consists of BCC and silicide phase

and eutectic structure composed of the both phases are formed on the grain boundaries. The dendrite structure and eutectic structure of alloys are refined with boron content increasing

and the morphologies are converted from dendrite structure to near equiaxed grains. The yield strength of alloys is increased from 1 766 MPa to 2 076 MPa

the ultimate strength is increased from 2 091 MPa to 2 270 MPa

and the fracture strain is reduced from 16.47% to 13.33%. The strength of alloy is synergistically improved by grain refinement strengthening and solid solution strengthening

while plasticity improvement induced by grain refinement effect is unable to offset the plasticity decrease caused by the solid solution strengthening effect

therefore the plasticity is decreased with increase of boron.