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http://dx.doi.org/10.5781/KWJS.2007.25.3.028

Effects of Amorphous Phase Fraction on the Scratch Response of NiTiZrSiSn Bulk Meatllic Glass in the Kinetic Spraying Process  

Yoon, Sang-Hoon (Kinetic spray coating laboratory, Division of Materials Science & Engineering, College of Engineering, Hanyang University)
Kim, Soo-Ki (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 Welding and Joining / v.25, no.3, 2007 , pp. 28-36 More about this Journal
Abstract
A bulk amorphous NiTiZrSiSn powder produced using an inert gas atomization was sprayed by kinetic spraying process that is basically a solid-state deposition process onto a mild steel substrate. They were successfully overlaid onto the mild steel substrate. In order to evaluate the tribological behavior of the kinetic sprayed NiTiZrSiSn BMG (Bulk Metallic Glass) coatings, a partially crystallized coating and a fully crystallized coating were prepared by the isothermal heat treatments. Tribological behaviors were investigated in view of friction coefficient, hardness and amorphous phase fraction of coating layer. Surface morphologies and depth in the wear tracks were observed and measured by scanning electron microscope and alpha-step. From the examination of the scratch wear track microstructure, transition from the ductile like deformation (micro cutting) to the brittle deformation (micro fracturing) in the scratch groove was observed with the increase of the crystallinity.
Keywords
Amorphous; Kinetic spray coating; Crystallinity; Scratch test;
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