纤维尺寸和界面形态对定向凝固NiAl-9Mo共晶合金电化学腐蚀性能的影响（英文）
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摘要
由于凝固组织对腐蚀有着重要的影响,本文主要目地获取最优组织形态和电化学参数生产钼纳米丝。研究表明NiAl-Mo共晶合金定向凝固下,组织由基体NiA l相和纤维Mo相共生耦合生长。随着抽拉速率从10μm/s增大到40μm/s时,纤维尺寸从800 nm减小到300 nm,界面形态也从平界面变化成胞界面。同时在0.1 mol/L HCl电解液下测量其极化曲线,发现凝固速率为20μm/s时耐腐蚀性能最好。对于NiAl-Mo共晶合金,影响电化学腐蚀性能的不仅仅是纤维尺寸,还取决于界面形貌。为了更进一步研究界面形态对腐蚀的影响,设计了跃迁变速实验,实验表明定向凝固组织形貌会随着变速比的增大从平界面变成胞界面,最后变成枝界面,然而最后的纤维尺寸和变速比无关,和恒速抽拉相同。极化曲线表明平界面有着最好的耐腐蚀性能。
As the solidified microstructures have a significant influence on the corrosion behavior, the present work is thereby aimed to derive the optimum microstructures and electrochemical conditions for producing Mo nanowires. Eutectic microstructures showing coupling growth of NiAl phase and Mo fibers were obtained at growth rates from 10 μm/s to 40 μm/s. The fiber size varies from 800 nm to 300 nm, and decreases with the increase of solidification rate. The results of potentiodynamic polarization studies indicate that NiAl-Mo alloy at a growth rate of 20 μm/s has a better corrosion resistance in 0.1 mol/L HCl solution at room temperature. The electrochemical corrosion behavior of directionally solidified NiAl-Mo alloys not only depends on fiber size, but also relates to the interface morphology. To further analyze the influence of interface morphology on the corrosion behavior, velocity sudden change experiments were carried out. The microstructure of directionally solidified NiA l-Mo alloy transforms from planar to cellular and dendritic structures as the value of V/V_1 increases. The results of potentiodynamic polarization curves reveal that the planar structure has the highest corrosion resistance compared to other morphologies with the same fiber size of Mo-nanowires.
As the solidified microstructures have a significant influence on the corrosion behavior, the present work is thereby aimed to derive the optimum microstructures and electrochemical conditions for producing Mo nanowires. Eutectic microstructures showing coupling growth of NiAl phase and Mo fibers were obtained at growth rates from 10 μm/s to 40 μm/s. The fiber size varies from 800 nm to 300 nm, and decreases with the increase of solidification rate. The results of potentiodynamic polarization studies indicate that NiAl-Mo alloy at a growth rate of 20 μm/s has a better corrosion resistance in 0.1 mol/L HCl solution at room temperature. The electrochemical corrosion behavior of directionally solidified NiAl-Mo alloys not only depends on fiber size, but also relates to the interface morphology. To further analyze the influence of interface morphology on the corrosion behavior, velocity sudden change experiments were carried out. The microstructure of directionally solidified NiA l-Mo alloy transforms from planar to cellular and dendritic structures as the value of V/V_1 increases. The results of potentiodynamic polarization curves reveal that the planar structure has the highest corrosion resistance compared to other morphologies with the same fiber size of Mo-nanowires.
引文
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2 Jin R C,Cao Y W,Mirkin C A et al.Science[J],2001,294(5548):1901
3 Cui S W,Yin X Y,Yu Q L et al.Corrosion Science[J],2015,98:471
4 Yasakau K A,Tedim J,Zheludkevich M L et al.Corrosion Science[J],2012,58:41
5 Wirtz M,Martin C R.Advanced Materials[J],2003,15(5):455
6 Kamat P V,Huehn R,Nicolaescu R.Journal of Physical Chemistry B[J],2002,106(4):788
7 Hassel A W,Smith A J,Milenkovic S.Electrochimica Acta[J],2006,52(4):1799
8 Su H P,Shen J,Zhang J F et al.Rare Metal Materials and Engineering[J],2010,39(6):1009(in Chinese)
9 Ren H G,Wang W J,Gao J J et al.Rare Metal Materials and Engineering[J],2016,45(1):222(in Chinese)
10 Milenkovic S,Hassel A W,Schneider A.Nano Letters[J],2006,6(4):794
11 Osório W R,Peixoto L C,CantéM V et al.Electrochimica Acta[J],2010,55(13):4078
12 Peixoto L C,Osório W R,Garcia A.Journal of Power Sources[J],2009,192(2):724
13 Gali A,Bei H,George E P.Acta Materialia[J],2010,58(2):421
14 Yang L Y,Li S M,Chang X Q et al.Acta Materialia[J],2015,97:269
15 Chou Y L,Yeh J W,Shih H C.Corrosion Science[J],2010,52(8):2571
16 Bei H,George E P.Acta Materialia[J],2005,53(1):69
17 DudováM,Kucha?ováK,Barták T et al.Scripta Materialia[J],2011,65(8):699
18 Smith V G,Tiller W A,Rutter J W.Canadian Journal of Physics[J],1955,33(12):723
19 Cline H E,Anthony T R.Acta Metallurgica[J],1971,19(6):491
20 Jackson K A,Hunt J D,Jackson K H.AIME Met Soc Trans[J],1966,236:1129
21 Zhang J F,Shen J,Shang Z et al.Intermetallics[J],2012,21(1):18
22 Trivedi R,Mason J T,Verhoeven J D et al.Metallurgical Transactions A[J],1991,22(10):2523
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