【作者】
吴萍；
陈新亮；
姜恩永；
赵慈；
杜洪明；
田雅丽；
ANDO Teiichi；
【Author】
WU Ping, CHEN Xin liang, JIANG En yong ZHAO Ci, DU Hong ming, TIAN Ya li, ANDO Teiichi 3(1. Institute of Advanced Materials Physics, School of Sciences, Tianjin University, Tianjin 300072, China; 2. Key Laboratory of Advanced Ceramics and Machining Technology for Ministry of Education, Tianjin University, Tianjin 300072, China; 3. Department of Mechanical Industrial and Manufacturing Engineering, Northeastern University, Boston, MA 02115, USA)
【机构】
Institute of Advanced Materials Physics,School of Sciences,Tianjin University,Institute of Advanced Materials Physics,School of Sciences,Tianjin University,Institute of Advanced Materials Physics,School of Sciences,Tianjin University,Institute of Advanced Materials Physics,School of Sciences,Tianjin University,Institute of Advanced Materials Physics,School of Sciences,Tianjin University,Institute of Advanced Materials Physics,School of Sciences,Tianjin University,Department of Mechanical Industrial and Manufacturing Engineering, Northeastern University Tianjin 300072, China；
Key Laboratory of Advanced Ceramics and Machining Technology for Ministry of Education, Tianjin University, Tianjin 300072, China,Tianjin 300072, China,Tianjin 300072, China；
Key Laboratory of Advanced Ceramics and Machining Technology for Ministry of Education, Tianjin University, Tianjin 300072, China,Tianjin 300072, China,Tianjin 300072, China,Tianjin 300072, China,Boston, MA02115, USA；
【Abstract】 The undercooling and solidification of 150 μm and 185 μm droplets of Sn 5%Pb alloy prepared by the uniform droplet spray (UDS) process have been investigated. The enthalpy of the droplet has been measured by non adiabatic calorimetric method as a function of the flight distance. A droplet solidification simulation model has been used to compare with the experimental data. The results show that the enthalpy released by the droplets in the calorimeter is 11.88 J/g and 22.29 J/g less than the simulated values up to a certain flight distance at 0.485 m and 0.460 m for 150 μm and 185 μm droplets respectively, but agrees with the expected values at larger distance. The nucleation of the droplets takes place at the distance where the experimental and simulated enthalpy values agree. The droplets quenched before nucleation solidify into metastable supersaturated solid solution and have large undercooling. The formation of the metastable structure in the droplets has been verified metallographically and by calculations based on a thermodynamic model.更多还原
【基金】 NationalNaturalScienceFoundationofChina(No.50 1 0 4 0 0 8) ;TianjinNaturalScienceFoundationandProjectsponsoredbySRFforROCSSEM
