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Heterogeneous Nucleation and Solidification Prediction of Sn-Pb Alloy Droplets
Wu Pinga*1, Tian Yali1, Jiang Enyong1, Tang Wenchao1, Hiroki Fukuda2, Teiichi Ando2
1.School of Science,Tianjin University,Tianjin 300072;2.Department of Mechanical,Industrial and Manufacturing Engineering,Northeastern University,Boston,MA 02115
Abstract:
The Sn-5%Pb droplets with sizes of 150 and 185 μm were generated by Uniform Droplet Spray(UDS) under N2 atmosphere with 1. 36 μmol / L oxygen. The appearance of Sn-5%Pb droplets under the optical microscope showed that the droplets are uniform and spherical. The method employed non-adiabatic calorimetry to determine the nucleation point and undercooling of droplets. The fraction covered by oxide was calculated as a function of time and temperature. The model for heterogeneous nucleation catalyzed by oxidation on the droplet surface was developed,which was a reasonable expression of the heterogeneous nucleation and solidification behavior of Sn-Pb droplets. The CCT curves were computed using above experimental results under the heterogeneous surface nucleation of droplet. The same model can be applied to predict the heterogeneous nucleation behavior of the droplets for any type of cooling schedule. The calculation results are very reliable based on the experimental data.
Key words:  Sn-Pb alloy,Heterogeneous nucleation,Undercooling,Continuous cooling transformation curve
FundProject:
附件
Sn-Pb合金颗粒异质成核及其冷却凝固行为预测
吴萍*1, 田雅丽1, 姜恩永1, 唐文超1, HirokiFukuda2, TeiichiAndo2
1.天津大学理学院应用物理系,天津,300072;2.美国东北大学机械工业与制造工程系, 波士顿麻萨诸塞州 02115
摘要:
采用均匀颗粒成型法(Uniform Droplet Spray, UDS)在氮气氛下(氧含量为1.36 μmol/L)制备了150和185 μm Sn-5%Pb合金颗粒.采用光学显微镜观测颗粒的外观形貌,结果表明, UDS方法制备的微粒是粒度均匀的球状颗粒;利用非绝热容量法确定了颗粒的形核点及过冷度;计算了以时间和温度为函数的颗粒表面被氧化的比例,提出了以颗粒表面氧化为催化媒质的异质成核理论模型,合理反映了颗粒的异质成核过程.在此基础上计算了微粒表面异质形核条件下的连续冷却转变(Continuous Co
关键词:  Sn-Pb合金  异质成核  过冷度  连续冷却转变曲线
DOI:10.1088/1674-0068/17/4/471-475
分类号: