退火处理对AlCoCuFeNi_(0.2)高熵合金组织与性能的影响
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摘要
利用电弧熔炼技术制备得到AlCoCuFeNi_(0.2)高熵合金,研究了铸态与900℃退火态高熵合金的组织、力学性能、磁学性能之间的差异。研究发现,铸态及900℃退火态合金都是BCC+FCC+有序BCC共存结构,BCC相是主相,组织都是典型的树枝晶组织,都具有优良软磁性能。900℃退火后,BCC相向FCC相转变,合金塑性显著改善,强度和硬度有所下降,饱和磁化强度得到提高。
AlCoCuFeNi_(0.2) high-entropy alloys( HEAs) were prepared by arc melting. The differences in microstructure,mechanical properties and magnetic performances between the as-cast and 900 ℃-annealed HEAs were investigated. The results show that the alloys,ascast and annealed at 900 ℃,possess the mixed BCC + FCC + ordered BCC phase structure,for which BCC is the dominant phase. Both the two alloys possess dendritic structures and excellent soft magnetic performances. After annealed at 900 ℃,BCC phase transforms into FCC phase. Subsequently,the ductility and saturation magnetization of AlCoCuFeNi_(0.2) high-entropy alloys are greatly improved while the hardness and yield strength are weakened.
AlCoCuFeNi_(0.2) high-entropy alloys( HEAs) were prepared by arc melting. The differences in microstructure,mechanical properties and magnetic performances between the as-cast and 900 ℃-annealed HEAs were investigated. The results show that the alloys,ascast and annealed at 900 ℃,possess the mixed BCC + FCC + ordered BCC phase structure,for which BCC is the dominant phase. Both the two alloys possess dendritic structures and excellent soft magnetic performances. After annealed at 900 ℃,BCC phase transforms into FCC phase. Subsequently,the ductility and saturation magnetization of AlCoCuFeNi_(0.2) high-entropy alloys are greatly improved while the hardness and yield strength are weakened.
引文
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[2]Yeh J W.Recent progress in high-entropy alloys[J].Annales De Chimie-Science des Materiaux,2006,31:633-648.
[3]Jiang H,Jiang L,Qiao D X,et al.Effect of niobium on microstructure and properties of the CoCrFeNbxNi high entropy alloys[J].Journal of Materials Science and Technology,2017,33(7):712-717.
[4]Xiao D H,Zhou P F,Wu W Q,et al.Microstructure,mechanical and corrosion behaviors of Al CoCuFeNi-(Cr,Ti)high entropy alloys[J].Materials and Design,2017,116:438-447.
[5]Li P,Wang A,Liu C T.A ductile high entropy alloy with attractive magnetic properties[J].Journal of Alloys and Compounds,2017,694:55-60.
[6]张勇.非晶和高熵合金[M].北京:科学出版社,2010:67-82.
[7]刘亮.合金元素对高熵合金组织与性能的影响[D].长春:吉林大学,2012.
[8]Kao Y F,Chen S K,Chen T J,et al.Electrical,magnetic,and Hall properties of AlxCoCrFeNi high-entropy alloys[J].Journal of Alloys and Compounds,2011,509(5):1607-1614.
[9]Zhang Q,Xu H,Tan X H,et al.The effects of phase constitution on magnetic and mechanical properties of Fe CoNi(CuAl)x(x=0-1.2)high-entropy alloys[J].Journal of Alloys and Compounds,2017,693:1061-1067.
[10]Zhang K B,Fu Z Y,Zhang J Y,et al.Annealing on the structure and properties evolution of the CoCrFeNiCuAl high-entropy alloy[J].Journal of Alloys and Compounds,2010,502:295-299.
[11]Yu P F,Zhang L J,Cheng H,et al.The high-entropy alloys with high hardness and soft magnetic property prepared by mechanical alloying and high-pressure sintering[J].Intermetallics,2016,70:82-87.
[12]Zhuang Y X,Xue H D,Chen Z Y,et al.Effect of annealing treatment on microstructures and mechanical properties of Fe CoNiCuAl high entropy alloys[J].Materials Science and Engineering A,2013,572(11):30-35.
[13]Guo Liu,Wu Wenqian,Ni Song,et al.Effects of annealing on the microstructure evolution and phase transition in an Al CrCuFeNi2highentropy alloy[J].Micron,2017,101:69-77.
[14]Ma S G,Qiao J W,Wang Z H,et al.Microstructural features and tensile behaviors of the Al0.5CrCuFeNi2high-entropy alloys by cold rolling and subsequent annealing[J].Material and Design,2015,88:1057-1062.
[15]刘亮,张越.赵作福,等.热处理对CoCrFeNiMo高熵合金组织与硬度的影响[J].金属热处理,2016,41(8):29-32.Liu Liang,Zhang Yue,Zhao Zuofu,et al.Effect of heat treatment on microstructure and hardness of CoCrFeNiMo high entropy alloy[J].Heat Treatment of Metals,2016,41(8):29-32.
[16]Sathiaraj G D,Tsai C W,Yeh J W,et al.The effect of heating rate on microstructure and texture and formation during annealing of heavily cold-rolled equiatomiv CoCrFeMnNi high entropy alloy[J].Journal of Alloys and Compounds,2016,688:752-761.
[17]Zhang K B,Fu Z Y,Zhang J Y,et al.Annealing on the microstructure and properties evolution of CoCFeNiCuAl high-entropy alloy[J].Journal of Alloys and Compounds,2010,502:295-299.
[18]Tong C J,Chen Y L,Yeh J W,et al.Microstructure characterization of AlxCoCrCuFeNi high-entropy alloy system with multiprincipal elements[J].Metallurgical and Materials Transactions A,2005,36(4):881-893.
[19]Kao Y F,Chen T J,Chen S K,et al.Microstructure and mechanical property of as-cast,-homogenized,and-deformed AlxCoCrFeNi(0≤x≤2)high-entropy alloys[J].Journal of Alloys and Compounds,2009,488:57-64.
[20]Takeuchi A,Inoue A.Classification of bulk metallic glasses by atomic size difference,heat of mixing and period of constituent elements and its application to characterization of the main alloying element[J].Materials Transactions,2005,46(12):2817-2829.
[21]何俊阳.合金化对Fe CoNiCr系高熵合金组织及力学性能的影响[D].北京:北京科技大学,2016.
[22]Zhuang Y X,Liu W J,Chen Z Y,et al.Effect of elemental interaction on microstructure and mechanical properties of Fe Co Ni Cu Al alloys[J].Materials Science and Engineering A,2012,556:395-399.
[23]胡赓祥,蔡珣,戎咏华.材料科学基础[M].上海:上海交通大学出版社,2009.
[24]Zhang Yong,Zuo Tingting,Cheng Yongqiang,et al.High-entropy alloys with high saturation magnetization,electrical resistivity,and malleability[J].Scientific Reports,2013,3:1455.