刘明翔,王开,夏丹,蒋涛,朱子宗

• 1:重庆大学材料科学与工程学院

摘要(Abstract)：

采用耦合溶质场的相场模型模拟了亚共晶Al-2mol%Si二元合金枝晶生长过程,研究了不同过冷度条件下枝晶的生长形貌以及沿生长方向溶质浓度的分布情况,同时分析了固相溶质扩散系数对微观偏析的影响。结果表明:过冷度对溶质的分布有较大影响,过冷度的增加使凝固界面溶质的富集程度增大;增大固相溶质扩散系数,溶质的微观偏析程度减轻;计算结果与Ivantsov理论值能够较好的吻合。

关键词(KeyWords)： 铝硅合金;相场模型;微观偏析;枝晶生长

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51174244);; 中央高校基金(CDJZR11130005)

作者(Author): 刘明翔,王开,夏丹,蒋涛,朱子宗

DOI: 10.13289/j.issn.1009-6264.2014.03.039

参考文献(References)：

• [1]Ejiofor J U,Reddy R G.Developments in the processing and properties of particulate al-si composites[J].Journal of the Minerals Metals and Materials Society,1997,49(11):31-37.
• [2]Kvakaj T,Bidulsky'R.Aluminium Alloys,Theory and Applications[M].Croatia:InTech,2011.
• [3]胡汉起.金属凝固原理[M].北京:中国机械出版社,1999.
• [4]龙文元.铝合金凝固过程枝晶生长的相场法数值模拟[D].武汉:华中科技大学,2004.LONG Wen-yuan.Numerical simulation of dendritic growth in the solidification of Al alloys using a phase-field method[D].Wuhan:Huazhong University of Science and Technology,2004.
• [5]Kobayashi R.Modeling and numerical simulations of dendritic crystal growth[J].Physica D:Nonlinear Phenomena,1993,63(3-4):410-423.
• [6]Murray B T,Wheeler A A,Glicksman M E.Simulations of experimentally observed dendritic growth behavior using a phase-field model[J].Journal of Crystal Growth,1995,154(3-4):386-400.
• [7]赵彦,陈铮,张济祥,等.Ni75Al21.5Ti3.5合金时效行为的微观相场计算[J].材料热处理学报,2009,30(3):192-197.ZHAO Yan,CHEN Zheng,ZHANG Ji-xiang,et al.Microscopic phase-field calculation on aging behavior of Ni75Al21.5Ti3.5alloy[J].Transactions of Materials and Heat Treatment,2009,30(3):192-197.
• [8]Wheeler A A,Boettinger W J,Mcfadden G B.Phase-field model for isothermal phase transitions in binary alloys[J].Physical Review A,1992,45(10):7424-7439.
• [9]Kim S G,Kim W T,Suzuki T.Phase-field model for binary alloys[J].Physical Review E,1999,60(6):7186-7197.
• [10]Kim S G,Kim W T,Suzuki T.Interfacial compositions of solid and liquid in a phase-field model with finite interface thickness for isothermal solidification in binary alloys[J].Physical Review E,1998,58(3):3316-3323.
• [11]Beckermann C,Diepers H J,Steinbach I,et al.Modeling melt convection in phase-field simulations of solidification[J].Journal of Computational Physics,1999,154(2):468-496.
• [12]Losert W,Stillman D A,Cummins H Z,et al.Selection of doublet cellular patterns in directional solidification through spatially periodic perturbations[J].Physical Review E,1998,58(6):7492-7506.
• [13]Suzuki T,Ode M,Kim S G,et al.Phase-field model of dendritic growth[J].Journal of Crystal Growth,2002,237:125-13.
• [14]Warren J A,Boettinger W J.Prediction of dendritic growth and microsegregation patterns in a binary alloy using the phase-field method[J].Acta Metallurgica et Materialia,1995,43(2):689-703.
• [15]Lan C W,Shih C J.Phase field simulation of non-isothermal free dendritic growth of a binary alloy in a forced flow[J].Journal of Crystal Growth,2004,264(1/3):472-482.
• [16]Sun Q,Zhang Y T,Cui H X,et al.Phase field modeling of multiple dendrite growth of Al-Si binary alloy under isothermal solidification[J].China Foundry,2008,5(4):265-267.
• [17]Kaya H,adrlE,Gündüz M.Dendritic growth in an aluminum-silicon alloy[J].Journal of Materials Engineering and Performance,2007,16(1):12-21.
• [18]He Z,Zhou H B,Zhang Z Y,et al.The solute redistribution during solidification of Al-Si-Mg alloys[J].Advanced Materials Research,2012,368-373:979-982.
• [19]Mullins W W,Sekerka R F.Stability of a planar interface during solidification of a dilute binary alloy[J].Journal of Applied Physics,1964,35(2):444-451.
• [20]Wang C Y,Beckermann C.A multiphase solute diffusion model for dendritic alloy solidification[J].Metallurgical and Materials Transactions A,1993,24(12):2787-2802.
• [21]Ivantsov G P.Temperature field around a spherical,cylindrical and acicular crystal growing in a supercooled melt[J].Doklady Akademii Nauk SSSR,1947,58:567-569.

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