High ductility and strength by internal interface recrystallization of cold sprayed zinc and its fracture behavior

Wednesday, May 24, 2023: 2:00 PM
301B (Quebec City Convention Centre)
Dr. Chunjie Huang , Helmut Schmidt University, University of the Federal Armed Forces, Hamburg, Germany, Hamburg, Germany
Dr. Banglong Fu , Solid-State Materials Processing, Helmholtz-Zentrum Hereon, Institute of Materials Mechanics, Geesthacht, Germany
Mr. Ting Chen , Solid-State Materials Processing, Helmholtz-Zentrum Hereon, Institute of Materials Mechanics, Germany, Geesthacht, Germany
Ms. Levke wiehler , Helmut Schmidt University, University of the Federal Armed Forces, Hamburg, Germany, Hamburg, Germany
Dr. Alexander List , Helmut Schmidt University, University of the Federal Armed Forces, Hamburg, Germany, Hamburg, Germany
Mr. Andreas Elsenberg , Helmut Schmidt University, University of the Federal Armed Forces, Hamburg, Germany, Hamburg, Germany
Prof. Benjamin Klusemann , Solid-State Materials Processing, Helmholtz-Zentrum Hereon, Institute of Materials Mechanics, Geesthacht, Germany
Dr. Frank Gärtner , Helmut Schmidt University/University of the Federal Armed Forces Hamburg, Hamburg, Germany
Prof. Wenya Li , Northwestern Polytechnical University, Xi'an, China
Prof. Thomas Klassen , Helmut Schmidt University, University of the Federal Armed Forces, Hamburg, Germany, Hamburg, Germany
Tailoring strength and ductility in additive manufacturing or repair is key to successful applications. Therefore, cold spraying must be tuned for maximum amounts of well-bonded internal interfaces as well as sufficient softening of the highly work-hardened deposit. Zinc with its low melting temperature is an ideal model system to study phenomena associated with high strain rate deformation and local temperature distributions, both, in single impacts and thicker deposits. Bonding and recrystallization can be facilitated by covering wide parameter regimes in cold spraying. Despite less thermal influences, Zn single splats already show recrystallization at internal interfaces, which gets more prominent with higher process gas temperature. At the attained higher temperatures, coatings are almost fully recrystallized, and the recrystallization also seems to improve bonding to the deposit-substrate interface.

Under an optimum condition of Tgas at 350 oC, an ultimate deposit strength of up to 135 MPa and an elongation to failure of 18.4 % are reached, comparable to that of laser-manufactured or bulk Zn material. Thus, a well-tuned interplay between high amounts of bonded interfaces and softening by recrystallization allows for deriving bulk-like performance of cold sprayed material without additional post-treatments.

See more of: Cold Sprayed or Aerosol Deposition - Metals, Polymers, Ceramics, and Metal Matrix Composite Coatings II
See more of: Fundamentals/Research & Development