On the formation of metallic glass coatings by means of Cold Gas Spray technology

Abstract Novel Cold Gas Spray technology has been used to build-up coatings of Fe-base metallic glasses on low alloyed carbon steel. Impact morphologies have been studied demonstrating extensive shear band formation but also homogeneous plastic flow in the metallic glass particles despite high strain rates, 10 8 –10 9  s −1 , involved in the technique. Interestingly, thick coatings with good deposition efficiencies have been built-up in conditions of homogeneous flow. Coating formation is discussed in terms of fundamentals of dynamics of undercooled liquids, plastic flow mechanism and crystallization kinetics of metallic glasses. Therefore, the method herein established is valid for any metallic glass.