| Cu基亚稳难混溶合金液-液相变 |
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| 引用本文： | 何杰,赵九洲,李海权.Cu基亚稳难混溶合金液-液相变[J].北京科技大学学报,2008,30(12). |
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| 作者姓名： | 何杰 赵九洲 李海权 |
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| 作者单位： | 中国科学院金属研究所,沈阳,110016 |
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| 基金项目： | 国家自然科学基金资助项目
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中国科学院知识创新工程青年人才领域前沿资助项目
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| 摘 要： | 通过气体雾化技术研究了Cu100-XFeX (X=15, 20, 30和40)合金的凝固行为. 考虑少量相液滴形核、扩散长大、空间迁移、凝固界面与液滴间的相互作用以及体积分数等共同影响因素,建立了能描述该类合金凝固组织演变动力学模型. 将数学模型与雾化液滴飞行过程中运动、传热和传质的控制方程相耦合,给出了数值求解方法,模拟计算了Cu基亚稳难混溶合金液-液相分离过程. 结果表明:富Fe粒子的平均尺寸随着Fe含量的增加而增大;少量相液滴形核发生在基体熔体过饱和度峰值附近;随着冷却速度的增大,雾化液滴中少量相液滴的形核率增大,但平均半径减小;少量相液滴在Marangoni迁移和与固/液界面相互排斥共同作用下,向雾化液滴中心迁移,使雾化粉末最终形成壳型组织结构.
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| 关 键 词： | 难混溶合金 液-液相变 显微组织 气体雾化 数值模拟 |
Kinetics of liquid-liquid phase transformation in Cu-based alloys with a metastable miscibility gap |
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| HE Jie,ZHAO Jiuzhou,LI Haiquan.Kinetics of liquid-liquid phase transformation in Cu-based alloys with a metastable miscibility gap[J].Journal of University of Science and Technology Beijing,2008,30(12). |
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| Authors: | HE Jie ZHAO Jiuzhou LI Haiquan |
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| Institution: | HE Jie,ZHAO Jiuzhou,LI Haiquan Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China |
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| Abstract: | The solidification behavior of Cu100-XFeX(X=15,20,30 and 40)alloys was investigated by gas atomization.Considering the common action of minority phase spheres' nucleation,diffusion growth,spatial movement and interaction between solidification interface and minority phase spheres,a model was developed to describe the kinetics of metastable liquid-liquid phase transformation and microstructure evolution in the metastable immiscible alloys with different volume fractions of minority phase spheres.Coupled with... |
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| Keywords: | immiscible alloys liquid-liquid phase transformation microstructure gas atomization numerical simulation |
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