| 扰动对单相合金定向凝固固液界面生长形态的影响 |
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| 引用本文： | 王自东 李德富. 扰动对单相合金定向凝固固液界面生长形态的影响[J]. 北京科技大学学报, 1997, 19(6): 560-565 |
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| 作者姓名： | 王自东 李德富 |
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| 作者单位： | 北京科技大学材料科学与工程学院!北京，100083，北京科技大学材料科学与工程学院!北京，100083，北京科技大学材料科学与工程学院!北京，100083，北京科技大学材料科学与工程学院!北京，100083，北京有色金属研究总院 |
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| 摘 要： | 研究了扰动对单相合金在定向凝固过程中平面晶和胞晶固液界面生长形态的影响规律，给出了单相合金由平面晶向胞晶转变的临界条件及胞晶稳定生长的条件，首次用非线性理论中的线性稳定性理论，证明了单相合金在定向凝固过程中，固液界面由平面晶向胞晶转变和胞晶生长的分太 亚临界分叉；利用有机物模拟合金ＢｒＣ４在固液界面的面前沿有扰动的情况下进行实验，研究了固液界面前沿扰动对固液界面平胞转变和胞晶生长的分叉机制的影响规
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| 关 键 词： | 凝固 生长形态 单向合金 固液界面 定向凝固 |
Influence of the Perturbation on Growth Pattern at the Solid/liquid Interface during Directional Solidification of Alloy |
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| Wang Zidong. Influence of the Perturbation on Growth Pattern at the Solid/liquid Interface during Directional Solidification of Alloy[J]. Journal of University of Science and Technology Beijing, 1997, 19(6): 560-565 |
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| Authors: | Wang Zidong |
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| Abstract: | The influence of the perturbation on crystal growth patterns of plane and cell at the solid/ liquid interface during unidirectional solidification has been studied. The critical condition of the transition from plane to cell of alloys and the condition of the steady state growth of cell are given. It has been demonstrated by linear steady theory of nonlinear theory for the first time that the bifurcation mechanism of the transition from plane to cell and the interface of cell of alloy at the solid/liquid interface during unidirectional solidification is subcritical bifurcation. This bifurcation mechanism is proved by BrC4 alloy. |
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| Keywords: | solidification nonequilibrium nonlinearity subcritical bifurcation |
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