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金属学报  2019, Vol. 55 Issue (7): 831-839    DOI: 10.11900/0412.1961.2018.00450
  本期目录 | 过刊浏览 |
Al-Bi合金凝固过程及微合金化元素Sn的影响
黎旺1,2,孙倩1,2,江鸿翔1,赵九洲1,2()
1. 中国科学院金属研究所 沈阳 110016
2. 中国科学技术大学材料科学与工程学院 沈阳 110016
Solidification of Al-Bi Alloy and Influence of Microalloying Element Sn
Wang LI1,2,Qian SUN1,2,Hongxiang JIANG1,Jiuzhou ZHAO1,2()
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
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摘要: 

实验研究了Al-Bi合金凝固过程及微合金化元素Sn的影响,发现添加微量Sn能有效改变Al-Bi合金的液-液相变过程、细化富Bi相粒子。Sn对富Bi相的细化效果随着Sn添加量的增加而增强,当添加量≥0.10% (质量分数)时即可达到最佳细化效果。建立了Al-Bi合金凝固过程中组织演变的动力学模型,模拟分析了微合金化元素Sn作用下Al-Bi合金凝固组织形成过程。结果表明,微量Sn可有效降低Al-Bi合金两液相间的界面能,提高富Bi相液滴的形核率,促进Al-Bi合金形成弥散型凝固组织。

关键词 Al-Bi合金凝固微合金化界面能模拟    
Abstract

Al-Bi alloy has a low friction coefficient and high wear-resistant properties and is a good self-lubricating material for advanced bearings in automotive applications if the soft Bi-rich phase is dispersedly distributed in the comparatively harder Al-based matrix. However, Al-Bi alloy is a typical immiscible alloy. When cooling a homogeneous single phase liquid of Al-Bi alloy in the miscibility gap, it transforms into two liquids. The liquid-liquid phase transformation generally leads to the formation of a phase segregated microstructure. In the last decades, considerable efforts have been made to study the solidification behavior of Al-Bi alloy. It is demonstrated that the microstructure evolution during the liquid-liquid decomposition is a result of concurrent actions of the nucleation, growth, Ostwald ripening and motions of the Bi-rich droplets. The nucleation and the immigration of the Bi-rich droplets show a dominant influence on the solidification microstructure of Al-Bi alloy. Enhancing the nucleation rate and reducing the Marangoni migration velocity of the Bi-rich droplets promote the formation of a well dispersed microstructure. Considering that addition of surface active element to the alloy may result in a reduction in the liquid-liquid interface energy, and thus reduce the nucleation energy barrier and Marangoni migration velocity of the Bi-rich droplets, the possibility to control the solidification process and microstructure of Al-Bi alloys by adding micro-alloying element Sn was investigated. The experimental results show that microalloying element Sn can cause an effective refinement of the Bi-rich particles. The refining effect increases with the increase of Bi content up to 0.10%Sn (mass fraciton). A model was developed to calculate the microstructure formation. The numerical results demonstrate that Sn can act as an effective surface active element for Al-Bi alloys and promote the formation of a well dispersed microstructure.

Key wordsAl-Bi alloy    solidification    microalloying    interfacial energy    simulation
收稿日期: 2018-09-25      出版日期: 2019-02-26
ZTFLH:  TG111.4,TG27  
基金资助:国家自然科学基金项目(Nos.51471173);国家自然科学基金项目(51771210);国家自然科学基金项目(51501207);中国载人航天工程项目(China Manned Space Engineering Project)
通讯作者: 赵九洲     E-mail: jzzhao@imr.ac.cn
Corresponding author: Jiuzhou ZHAO     E-mail: jzzhao@imr.ac.cn
作者简介: 黎 旺,女,1993年生,博士生

引用本文:

黎旺,孙倩,江鸿翔,赵九洲. Al-Bi合金凝固过程及微合金化元素Sn的影响[J]. 金属学报, 2019, 55(7): 831-839.
Wang LI,Qian SUN,Hongxiang JIANG,Jiuzhou ZHAO. Solidification of Al-Bi Alloy and Influence of Microalloying Element Sn. Acta Metall Sin, 2019, 55(7): 831-839.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2018.00450      或      http://www.ams.org.cn/CN/Y2019/V55/I7/831

图1  Al-9.0%Bi合金熔体冷却曲线
图2  Al-xBi合金显微组织
图3  Al-xBi合金中富Bi相粒子的二维尺寸分布
图4  Al-9.0%Bi-ySn合金显微组织
图6  Al-xBi-0.10%Sn合金显微组织
图7  Al-xBi-ySn (y=0、0.10%)合金内富Bi相粒子二维平均直径随Bi含量的变化
图5  Al-9.0%Bi-ySn合金中富Bi相粒子的二维平均尺寸随Sn添加量的变化
图8  实验测定Al-9.0%Bi合金中富Bi相颗粒体积分数(?p)沿试样轴向和径向分布
图9  Al-9.0%Bi和Al-9.0%Bi-0.10%Sn合金测量熔体温度(Tmelt)、平衡组元互溶温度(Tb)、过冷度(ΔTd=Tb-Tmelt)、富Bi相液滴形核率(Id)和α-Al体积分数(ξα-Al)随凝固时间的变化
图10  Al-9.0%Bi和Al-9.0%Bi-0.10%Sn合金富Bi相二维平均直径(<Dd>)、数量密度(Nd)和Id随凝固时间的变化
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