微观相场法研究镍基合金沉淀相间作用的定向粗化机制(英文)
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摘要
采用微观相场法研究Ni-Al-V合金中由长周期沉淀相各向异性生长所引起的定向粗化机制以及沉淀过程对有序相的不同作用。结果表明:DO22相主要沿着其短轴方向粗化,挤压相邻的L12相并导致原子间的相互作用,使其与基体间的错配发生变化,并在特定方向上释放出配错能,形成Al原子的扩散通道,引起其原子占位在空间上的各向异性,最终导致L12相定向粗化。随着时效温度的升高,两相的析出滞后,而DO22相在较高温度的滞后更为显著;Al和V的平均占位几率降低,且Al降低得较多。
A microscopic phase-field model was used to investigate a directional coarsening mechanism caused by the anisotropic growth of long period stacking and different effects of phases on precipitation in Ni-Al-V alloy.The results show that DO22 mainly coarsens along its short axis,which may press the neighboring L12,leading to the interaction among atoms.Diffusion channels of Al are formed in the direction where the mismatch between γ' and γ reduces;the occupation probabilities are anisotropic in space;and direction coarsening of L12 occurs finally.With a rise of ageing temperature,phases appear later and DO22 is much later at a higher temperature,the average occupation probabilities of Al and V reduce,and Al changes more than V.
A microscopic phase-field model was used to investigate a directional coarsening mechanism caused by the anisotropic growth of long period stacking and different effects of phases on precipitation in Ni-Al-V alloy.The results show that DO22 mainly coarsens along its short axis,which may press the neighboring L12,leading to the interaction among atoms.Diffusion channels of Al are formed in the direction where the mismatch between γ' and γ reduces;the occupation probabilities are anisotropic in space;and direction coarsening of L12 occurs finally.With a rise of ageing temperature,phases appear later and DO22 is much later at a higher temperature,the average occupation probabilities of Al and V reduce,and Al changes more than V.
引文
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[22]PRIKHODKO S V,CARNES J D,SAAK D G,ARDELL A J.Elastic constants of a Ni-12.69at.%Al alloy from295to1300K[J].Scr Mater,1997,38:67-75.
[23]MIYAZAKI T,IMAMURA M,KOZATI T.The formation of”γ′precipitate doublets”in Ni-Al alloys and their energetic stability[J].Mater Sci Eng,1982,54:9-17.
[24]SINGH J B,SUNDARARAMAN M,BANERJEE S,MUKHOPADHYA P.Evolution of order in melt-spun Ni-25at.%V alloys[J].Acta Mater,2005,53:1135-1143.
[2]STALLYBRASS C,SCHNEIDER A,SAUTHOFF G.The strengthening effect of(Ni,Fe)Al precipitates on the mechanical properties at high temperatures of ferritic Fe-Al-Ni-Cr alloys.[J].Intermetallics,2005,13:1263-1268.
[3]NABARRO F R N.Rafting in superalloys[J].Metall Mater Trans A,1996,27:513-530.
[4]TETSU I,DAISUKE K,MASAHIKO H,KATSUSHI T,MAKOTO O,TADAHARU Y,HIROSHI H.Rafting mechanism for Ni-base superalloy under external stress:Elastic or elastic-plastic phenomena[J].Acta Mater,2003,51:4033-4044.
[5]SOCRATE S,PARKS D M.Numerical determination of the elastic driving force for directional coarsening in Ni-superalloys[J].Acta Metall,1993,41:2185-2209.
[6]ZHAO X B,LIU L,YANG C B,LI Y F,ZHANG J,FU H Z.Influence of crystal orientation on cellular growth of a nickel-base single crystal superalloy[J].J Alloys Compd,2011,509:9645-9649.
[7]VOGEL F,WANDERKA N,MATSUMURA S,BANHART J.Early stages of decomposition within the gamma'phase of a Ni-Al-Ti model alloy.[J].Intermetallics,2012,22:226-230.
[8]BRUNETTI G,SETTEFRATI A,HAZOTTE A,DENIS S,FUNDENBERGER J J,TIDU A.Determination of gamma-gamma'lattice misfit in a single-crystal nickel-based superalloy using convergent beam electron diffraction aided by finite element calculations[J].Micron,2012,43:396-406.
[9]HOSSEINI S S,NATEGH S,EKRAMI A A,Changes of gamma'precipitate characteristics in damaged superalloy IN738LC during different stages of rejuvenation heat treatment cycles[J].Materials Science and Technology,2012,2:213-219.
[10]CAHN J W,HILLIARD J E.Free energy of a nonuniform system:Interfacial free energy[J].Chem Phys,1958,28:258-267.
[11]JOHNSON R A,BROWN J R.Vacancies and antisite defects in ordered alloys[J].Journal of Materials Research,1992,12:3213-3218.
[12]VOORHEES P W,MCFADDEN G B,JOHNSON W C.On the morphological development of second-phase particles in elastically stressed solids[J].Acta Metallurgica et Materialia,1992,40:2979-2992.
[13]TIAN Su-gui,ZHOU Hui-hua,ZHANG Jing-hua,YANG Hong-cai.A directional coarsening mechanism of theγ′-phase during creep of a single crystal nickel-base superalloy[J].Acta Metall Sin,1998,34:591-596.
[14]PENG Zhi-fang,YAN Yan-hui.Phase morphology evolution and anisotropic creep behaviour of nickel-base single crystal superalloy CMSX-4[J].Acta Metall Sin,1997,33:1147-1154.
[15]LAPIN J.Effect of directional solidification and heat treatments on the microstructure and mechanical properties of multiphase intermetallic Zr-doped Ni-Al-Cr-Ta-Mo alloy.[J].Intermetallics,2006,14:1417-1427.
[16]CHENG K Y,JOB C Y,KIMC D H,JINA T,HUA Z Q.Influence of local chemical segregation on theγ′directional coarsening behavior in single crystal superalloy CMSX-4[J].Materials Characterization,2009,60:210-218.
[17]CABET E,PASTUREL A,DUCASTELLE F.L12-DO22competition in the pseudobinary(Pt,Rh)3V,Pt3(V,Ti),and(Pd,Rh)3V alloy:Phase stability and electronic structure.[J].Physical Review Letter,1996,76:3140-3143.
[18]TOMIHISA K,KANENOAND Y.Phase relation and microstructure in multi-phase intermetallic alloys based on Ni3Si-Ni3Ti-Ni3Nb pseudo-ternary alloy system.[J].Intermetallics,2004,12:317-325.
[19]KHACHATURYAN A G.Theory of structural transformation in solids[M].New York:Wiley,1983:129.
[20]CHEN L Q,KHACHATURYAN A G.Computer simulation of decomposition reactions accompanied by a congruent ordering of the second kind[J].Scripta Metallurgica et Materialia,1991,25:61-66.
[21]WANG Y,KHACHATURYAN A G.Shape instability during precipitate growth in coherent solids[J].Acta Metall Mater,1995,43:1837-1845.
[22]PRIKHODKO S V,CARNES J D,SAAK D G,ARDELL A J.Elastic constants of a Ni-12.69at.%Al alloy from295to1300K[J].Scr Mater,1997,38:67-75.
[23]MIYAZAKI T,IMAMURA M,KOZATI T.The formation of”γ′precipitate doublets”in Ni-Al alloys and their energetic stability[J].Mater Sci Eng,1982,54:9-17.
[24]SINGH J B,SUNDARARAMAN M,BANERJEE S,MUKHOPADHYA P.Evolution of order in melt-spun Ni-25at.%V alloys[J].Acta Mater,2005,53:1135-1143.