环境对高熵合金Al_(0.1)CoCrFeNi力学性能的影响
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摘要
研究高熵合金Al_(0.1)CoCrFeNi在真空、空气和不同压力氢气中拉伸时,环境对合金力学性能的影响.研究结果表明:当Al_(0.1)CoCrFeNi合金在空气和氢气环境中拉伸时,少量氢原子进入合金后对其延伸率存在明显的改善作用;随着拉伸环境中氢气压力的增加,合金的延伸率随之提高,而当氢气压力大于0.010 MPa后,合金延伸率的提升速率明显减缓;在3种环境中拉伸时,合金的断口形貌均为韧窝状塑性断口,且在断口存在微孔洞.
Effects of the environment on mechanical properties of Al_(0.1)CoCrFeNi alloy when tested in vacuum, air and gaseous hydrogen at different pressures were investigated. The result shows that a few hydrogen atoms can significantly improve elongation of the Al_(0.1)CoCrFeNi alloy when tested in air and gaseous hydrogen. The elongation of Al_(0.1)CoCrFeNi alloy increases with the increase of pressure of gaseous hydrogen. The increase rate of elongation becomes slower when the pressure of gaseous hydrogen is more than 0.010 MPa. Fractographs of Al_(0.1)CoCrFeNi alloy exhibits all transgranular fracture patterns. Some micro-voids exist on the fractograph surfaces when tensile test is performed in three environments.
Effects of the environment on mechanical properties of Al_(0.1)CoCrFeNi alloy when tested in vacuum, air and gaseous hydrogen at different pressures were investigated. The result shows that a few hydrogen atoms can significantly improve elongation of the Al_(0.1)CoCrFeNi alloy when tested in air and gaseous hydrogen. The elongation of Al_(0.1)CoCrFeNi alloy increases with the increase of pressure of gaseous hydrogen. The increase rate of elongation becomes slower when the pressure of gaseous hydrogen is more than 0.010 MPa. Fractographs of Al_(0.1)CoCrFeNi alloy exhibits all transgranular fracture patterns. Some micro-voids exist on the fractograph surfaces when tensile test is performed in three environments.
引文
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[2]Yeh J W,Chen S K,Lin S J,et al.Nanostructured high-entropy alloys with multiple principal elements:novel alloy design concepts and outcomes[J].Advanced Engineering Materials,2004,6(5):299-303.
[3]Yeh J W.Recent progress in high-entropy alloys[J].European Journal of Control,2006,31(6):633-648.
[4]Tsai M H,Yeh J W.High-entropy alloys:a critical review[J].Materials Research Letters,2014,2(3):107-123.
[5]万晓景,朱家红,黄胜标.Fe3Al与水汽及氧气的表面反应[J].金属学报,1995,31(16):183-187.
[6]Chen Y X,Wan X J,Xu W X.Surface reaction of TiAl with water vapor or oxygen[J].Journal of Meterials Science and Technology,2003,19(4):334-336.
[7]Lee K H,Lukowski J T,White C L.Effect of gaseous hydrogen and water vapor pressure on environmental embrittlement of Ni3Al[J].Intermetallics,1997,5(6):483-490.
[8]陈业新.金属间化合物的环境氢脆[J].上海大学学报(自然科学版),2011,17(4):487-502.
[9]马杰,陈业新,Liu C T.硼对有序态Ni3Fe合金氢气环境中氢脆敏感性的影响[J].南京大学学报(自然科学),2009,45(2):241-247.
[10]杜艳艳.多主元合金的微结构及性能研究[D].大连:大连理工大学,2011.
[11]Wang W R,Wang W L,Wang S C,et al.Effects of Al addition on the microstructure and mechanical property of Alx CoCrFeNi high-entropy alloys[J].Intermetallics,2012,26:44-51.
[12]Komarasamy M,Kuman N,Tang Z,et al.Effect of microstructure on the deformation mechanism of friction stir-processed Al0.1CoCrFeNi high entropy alloy[J].Materials Research Letters,2015,3(1):30-34.
[13]Wang Y P,Li B S,Ren M X,et al.Microstructure and compressive properties of AlCrFeCoNi high entropy alloy[J].Materials Science and Engineering:A,2008,491(1/2):154-158.
[14]Fang S C,Chen W P,Fu Z Q.Microstructure and mechanical properties of twinned Al0.5CrFeNiCo0.3C0.2 high entropy alloy processed by mechanical alloying and spark plasma sintering[J].Materials and Design,2014,54:973-979.
[15]Gali A,George E P.Tensile properties of high-and medium-entropy alloys[J].Intermetallics,2013,39:74-78.
[16]Shun T T,Du Y C.Microstructure and tensile behaviors of FCC Al0.3CoCrFeNi high entropy alloy[J].Journal of Alloys and Compounds,2009,479(1/2):157-160.
[17]L¨u H,Li M D,Zhang T C,et al.Hydrogen-enhanced dislocation emission,motion and nucleation of hydrogen-induced cracking for steel[J].Science in China Series E:Technological Sciences,1997,40(5):530-538.
[18]Robertson I M.The effect of hydrogen on dislocation dynamics[J].Engineering Fracture Mechanics,1999,64(5):649-673.
[19]褚武扬,乔利杰,李金许,等.氢脆和应力腐蚀-基础部分[M].北京:科学出版社,2013:312-349.
[20]刘源,陈敏,李言祥,等.AlxCoCrCuFeNi多主元高熵合金的微观结构和力学性能[J].稀有金属材料与工程,2009,38(9):1602-1607.
[21]欧子义.AlCoCrCuFeNix高熵合金微观组织及性能的研究[D].南宁:广西大学,2010.
[22]Sakaki K,Kawase T,Hirato M,et al.The effect of hydrogen on vacancy generation in iron by plastic deformation[J].Scripta Materialia,2006,55(11):1031-1034.
[23]Gavriljuk V G,Bugaev V N,Petrov Y N,et al.Hydrogen-induced equilibrium vacancies in FCC iron-base alloys[J].Scripta Materialia,1996,34(6):903-907.
[24]Xu Z R,Mc Lellan R B.Hydrogen enhanced diffusional creep[J].Nuclear Medicine&Biology,1998,46(13):4543-4547.
[25]Mc Lellan R B,Xu Z R.Hydrogen-induced vacancies in the iron lattice[J].Scripta Materialia,1997,36(10):1201-1205.
[26]Fukai Y.Formation of superabundant vacancies in M-H alloys and some of its consequences:a review[J].Journal of Alloys and Compounds,2003,356/357:263-269.
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