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http://dx.doi.org/10.5695/JKISE.2008.41.6.301

Effects of Impact Velocity on Crystallization and Activation Energy of Cu-based Bulk Metallic Glasses in Kinetic Spray Coating  

Yoon, Sang-Hoon (Kinetic Spray Coating Laboratory, Division of Materials Science & Engineering, College of Engineering, Hanyang University)
Bae, Gyu-Yeol (Kinetic Spray Coating Laboratory, Division of Materials Science & Engineering, College of Engineering, Hanyang University)
Kim, Jung-Hwan (Kinetic Spray Coating Laboratory, Division of Materials Science & Engineering, College of Engineering, Hanyang University)
Lee, Chang-Hee (Kinetic Spray Coating Laboratory, Division of Materials Science & Engineering, College of Engineering, Hanyang University)
Publication Information
Journal of the Korean institute of surface engineering / v.41, no.6, 2008 , pp. 301-307 More about this Journal
Abstract
In this paper, nanocrystallization of CuNiTiZr bulk metallic glass (BMG) subjecting to a kinetic spraying, dependent on impact velocity, was investigated by numerical and experimental approaches. The crystallization fraction and nucleation activation energy of initial feedstock and as-deposited coating were estimated by DSC and Kissinger method, respectively. The results of numerical modeling and experiment showed that the crystalline fraction and nucleation activation energy in BMG coatings were depended on kinetic energy of incident particle. Upon impact, the conversion of particle kinetic energy leads to not only decreasing free energy barrier but also increasing the driving force for an amorphous to crystalline phase transformation. The nanocrystallization of BMGs is associated with the strain energy delivered by a plastic deformation with a high strain rate.
Keywords
Kinetic spray; High-resolution electron microscopy (HREM); Metallic glasses; Crystallization; Superplasticity;
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