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Vacuum Electromagnetic Levitation Melting and Undercooling of Peritectic Terfenol-D 马伟增1,季诚昌1,郑红星1,李建国1 (1.School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China) Abstract:For the first time, the undercooling of a magnetostrictive material-a near peritectic Tb0.27Dy0.73Fe1.90 alloy was realized by vacuum electromagnetic levitation melting and 60 K......
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are analyzed in terms of the constitutional undercooling criterion. Key words: peritectic reaction; Cu-Ge alloys; directional solidification; microstructure; constitutional undercooling 1 Introduction... in the macroseparation structure. The constitutional undercooling criterion is used to analyze the morphological stabilities of the solidifying peritectic phase and the remelting of the primary phase......
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rule and Scheil’s equation, and the exact value is determined by the effect of back diffusion, the initial undercooling and the cooling rate. Key words: Ni-Cu alloy; rapid solidification; diffusion; undercooling 1 Introduction The major aim of solidification science is to optimize the mechanical and physical properties of solidified alloys by microstructure control. Such an aim can be fulfilled......
Undercooling and rapid solidification of Nb-Si eutectic alloys studied by long drop tube WANG Yu-ren(王育人), DONG Shu-yong(董树勇), WEI Bing-chen(魏炳忱), LI Wei-huo(李维火) National Microgravity Laboratory... turbine applications. The two-phase Nb/Nb5Si3 in situ composites exhibit a good balance in mechanical properties. Using the 52 m drop tube, the effect of undercooling and rapid solidification......
; 文章编号:1672-7207(2015)08-2837-06 Effect of Al-5Ti-0.2C refiner on nucleation and undercooling degree of 7085 aluminum alloy NING Jiajie, LI Xiaoqian, JIANG..., and DSC was used to measure the undercooling degree of the melt during solidification. The effects of Al-5Ti-0.2C refiner on nucleation and undercooling degree during the solidification of 7085......
by setting the b/a (a and b are the semi-major and semi-minor sizes in the initial elliptical crystals, respectively) value to be less than or equal to 1. With an increase in the undercooling value, the equilibrium morphology of the crystal changes from a star-like shape to facet dendrites without side branches. The steady-state tip velocity increases exponentially when the dimensionless undercooling......