采用相场法模拟了Fe-0.5%C合金等温凝固过程中单个枝晶和多个枝晶的生长,研究了过冷度、各向异性、界面厚度、晶体取向以及扰动对枝晶形貌的影响,获得了具有二次分枝的枝晶形貌,再现了枝晶生长过程及枝晶臂之间的竞争生长.模拟结果表明:凝固过程中存在溶质富集和枝晶偏析,枝晶主干溶质浓度最低,枝晶臂之间的液相浓度最高.随着过冷度的增大,枝晶生长加快且分枝发达;界面厚度直接影响枝晶的生长速度;各向异性影响枝晶的形态;晶体取向与坐标轴方向一致时枝晶优先生长;扰动的加入导致枝晶分枝的形成.
参考文献
| [1] | W.Kurz,D.J.Fisher,Fundamentals of Solidification,4th edition (Switzerland,Trans Tech Publications Ltd,1998)p.4 |
| [2] | R.Sasikumar,E.Jacob,Simulation of side branch development in thermal dendritic grains,Materials Science Form,215-216,191(1996) |
| [3] | Pil-Ryung Cha,Dong-Hee Yeon,Jong-Kyu Yoon,Phasefield model for multicomponent alloy solidification,Journal of Crystal Growth,274,281(2005) |
| [4] | D.M.Anderson,G.B.McFadden,A.A.Wheeler,A phasefield model of solidification with convection,Physica D:Nonlinear Phenomena,135,175(2000) |
| [5] | Hiroki Kobayashi,Machiko Ode,Seong Gyoon Kim,Won Tae Kim,Toshio Suzuki,Phase-field model for solidification of ternary alloys coupled with thermodynamic database,Scripta Materialia,48,689(2003) |
| [6] | FENG Li,WANG Zhiping,LU Yang,ZHU Changsheng,Phase-field model of isothermal with multiple solidification of binary alloy grains,Acta Physics Sinica,57,1084(2008)(冯力,王智平,路阳,朱昌盛,二元合金多晶粒的枝晶生长的等温相场模型,物理学报,57,1084(2008)) |
| [7] | LONG Wenyuan,CAI Qizhou,WEI Bokang,CHEN Wenliang,Simulation of dendritic growth of multicomponent alloys using phase-field method,Acta Physica Sinica,55,1341(2006)(龙文元,蔡启舟,魏伯康,陈文亮,相场法模拟多元合金过冷熔体中的枝晶生长,物理学报,55,1341(2006)) |
| [8] | NIU Yane,YAN Wen,FENG Xiaoming,CHEN Jian,FAN Xinhui,Phase-field simulation of dendrite morphologies of Fe-C alloy in isothermal solidification,Hot Working Technology,37,4(2008)(牛艳娥,严文,冯小明,陈建,范新会,Fe-C合金等温凝固过程枝晶形貌的相场法模拟,热加工工艺,37,4(2008)) |
| [9] | NIU Yane,YAN Wen,FENG Xiaoming,CHEN Jian,FAN Xinhui,Phase-field simulation of Fe-C Alloy in the isothermal solidification,Foundry Technology,29,244(2008)(牛艳娥,严文,冯小明,陈建,范新会,Fe-C合金等温凝固过程的相场法模拟,铸造技术,29,244(2008)) |
| [10] | Toshio Suzuki,Machiko Ode,Seong Gyoon Kim,Won Tae Kim,Phase-field model of dendritic growth,Journal of Crystal Growth,237-239,125(2002) |
| [11] | Seong Gyoon Kim,Won Tae Kim,Toshio Suzuki,Phase-field model for binary alloys,Physical Review E,60(6),7186 (1999) |
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