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

作　　者：尹荣 章立钢[1] YIN Rong;ZHANG Ligang(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《矿冶工程》2024年第3期170-175,共6页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51871248)。

摘　　要：通过XRD、SEM、EBSD和单轴拉伸测试,对不同Al含量(原子分数,%)Fe_(46-x)Ni_(20)Co_(20)Cr_(10)V_(4)Al_(x)(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,Fe_(46-x)Ni_(20)Co_(20)Cr_(10)V_(4)Al_(x)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,Fe_(34)Ni_(20)Co_(20)Cr_(10)V_(4)Al_(12)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。The phase structure,microstructure and mechanical properties of Fe_(46-x)Ni_(20)Co_(20)Cr_(10)V_(4)Al_(x)(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 Fe_(46-x)Ni_(20)Co_(20)Cr_(10)V_(4)Al_(x) 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 Fe_(34)Ni_(20)Co_(20)Cr_(10)V_(4)Al_(12) 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 

分 类 号：TB302[一般工业技术—材料科学与工程]