Al含量对FeNiCoCrVAl高熵合金组织和力学性能的影响
Effect of Al Content on Microstructure and Mechanical Properties of FeNiCoCrVAl High-Entropy Alloys
尹荣 1章立钢1
作者信息
- 1. 中南大学 材料科学与工程学院,湖南 长沙 410083
- 折叠
摘要
通过XRD、SEM、EBSD和单轴拉伸测试,对不同Al含量(原子分数,％)Fe46-xNi20Co20Cr10V4Alx(x=5,8,12,15)高熵合金的相结构、显微组织和力学性能进行了系统研究.结果表明,随着Al含量增加,Fe46-xNi20Co20Cr10V4Alx 高熵合金相结构由FCC单相转变为FCC+BCC双相结构,且强度随之增加,而塑性降低.其中,Fe34Ni20Co20Cr10V4Al12高熵合金在 900℃退火处理后,具有极好的强塑性匹配,其屈服强度、抗拉强度和断裂延伸率分别为 593 MPa、1009 MPa和 32.13％.Al含量 5％时,铸态和退火态高熵合金均为单一FCC相;Al含量8％,12％和15％时,高熵合金为FCC+BCC双相结构,退火处理促进了BCC相的析出,随着退火温度升高,BCC相占比增加.
Abstract
The phase structure,microstructure and mechanical properties of Fe46-xNi20Co20Cr10V4Alx(x=5,8,12,15)high-entropy alloys with different Al contents(atom fraction,％)were systematically investigated by using X-ray diffraction(XRD),scanning electron microscopy(SEM),electron backscatter diffraction(EBSD)and performing uniaxial tensile test.The results show that with the increase of Al content,the phase structure of Fe46-xNi20Co20Cr10V4Alx high-entropy alloys transforms from single-phase structure of face-centered cubic(FCC)to dual-phase structure of FCC and body-centered cubic(BCC).Also,the strength increases and ductility decreases.The Fe34Ni20Co20Cr10V4Al12 high-entropy alloy annealed at 900 ℃ exhibits an excellent strength-ductility balance,with yield strength,tensile strength and elongation to failure at 593 MPa,1009 MPa and 32.13％,respectively.With Al content of 5％,the as-cast and annealed high-entropy alloys remain single FCC phase.However,with Al content of 8％,12％and 15％,the high-entropy alloys all become FCC-BCC phase.The annealing treatment promotes the precipitation of BCC phase,and the proportion of BCC phase increases with increasing annealing temperature.
关键词
高熵合金/FeNiCoCrV/Al含量/显微组织/力学性能/强塑性匹配Key words
high-entropy alloys/FeNiCoCrV/Al content/microstructure/mechanical properties/strength-ductility balance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据