| Ti-44at%Al合金小尺寸铸件柱状晶/等轴晶演化过程模拟 |
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| 引用本文： | 王狂飞,李邦盛,任明星,米国发,郭景杰,傅恒志.Ti-44at%Al合金小尺寸铸件柱状晶/等轴晶演化过程模拟[J].物理学报,2007,56(6):3337-3343. |
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| 作者姓名： | 王狂飞 李邦盛 任明星 米国发 郭景杰 傅恒志 |
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| 作者单位： | (1)哈尔滨工业大学材料科学与工程学院，哈尔滨 150001; (2)河南理工大学材料科学与工程学院，焦作 454100 |
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| 摘 要： | 利用溶质扩散控制模型对TiAl合金柱状晶/等轴晶转变过程进行了数值模拟，结果表明，等轴晶在柱状晶前沿形核及生长过程中，当两个扩散场相遇时，观察到成分冲击波，它可能是导致柱状晶停止生长的一个主要原因.利用该模型，对小铸件柱状晶/等轴晶转变过程进行了预测，在模拟过程中发现柱状晶界面前沿液相温度梯度，成分过冷度可联合对柱状晶/等轴晶转变产生影响，模拟与实验观察符合较好.
关键词：
TiAl合金
成分冲击波
柱状晶/等轴晶转变
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| 关 键 词： | TiAl合金 成分冲击波 柱状晶/等轴晶转变 |
| 文章编号： | 1000-3290/2007/56(06)/3337-07 |
| 收稿时间： | 8/9/2006 12:00:00 AM |
| 修稿时间： | 2006-08-09 |
Numerical simulation of columnar to equiaxial transition during solidification of Ti-44at%Al alloy |
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| Wang Kuang-Fei,Li Bang-Sheng,Ren Ming-Xing,Mi Guo-Fa,Guo Jing-Jie,Fu Heng-Zhi.Numerical simulation of columnar to equiaxial transition during solidification of Ti-44at%Al alloy[J].Acta Physica Sinica,2007,56(6):3337-3343. |
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| Authors: | Wang Kuang-Fei Li Bang-Sheng Ren Ming-Xing Mi Guo-Fa Guo Jing-Jie Fu Heng-Zhi |
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| Institution: | 1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; 2 . School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454100, China |
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| Abstract: | Solute diffusion controlled solidification model was employed to simulate the columnar to equiaxial transition (CET) of TiAl alloy casting. The simulation results show that solute shock wave occurs when the diffusion fields of columnar and equiaxial dendrites meet. It could be one of the main factors blocking the columnar dendrite growth. Using this model, the CET in small castings was qualitatively predicted. It was found that the thermal gradient and solute undercooling ahead of the columnar tips of CET act jointly on CET, being in good agreement with experimental observations. |
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| Keywords: | TiAl alloys solute shock wave columnar to equiaxial transition |
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