Characterization of as-deposited cold sprayed Cr-coating on Optimized ZIRLO™ claddings
Journal article, 2021

As-produced Cr-coated Optimized ZIRLO™ cladding material fabricated with the cold-spray (CS) deposition process is studied. Cross-sectional electron microscopy, nano-hardness profiling, transmission electron microscopy, transmission Kikuchi diffraction, and atom probe tomography (APT) were performed to investigate the nature of the CS Cr-coating/Optimized ZIRLO™ interface, the microstructure of the coating, and the effects of the deposition on the Zr-substrate microstructure. The former surface of the Zr-substrate was found to have a highly deformed nano-crystalline microstructure, the formation of which was attributed to dynamic recrystallization occurring during coating deposition. This microstructural change, evaluated with electron backscattered diffraction and nano-hardness profiling, appeared to be confined to a depth of a few microns. Through APT analysis, a 10–20 nm thick intermixed bonding region was observed at the interface between coating and substrate. The chemical composition of this region suggests that this layer originated from a highly localized shearing and heating of a thin volume of the outermost former surface of the substrate. The study of the intermixed bonding region's crystalline structure was performed with high resolution transmission electron microscopy and revealed a distorted hexagonal close-packed structure.

Atom probe tomography

Cold spray deposition

Chromium coatings

Zirconium alloys

Accident tolerant fuels

Author

Andrea Fazi

Chalmers, Physics, Microstructure Physics

Hisham Aboulfadl

Chalmers, Physics, Microstructure Physics

Anand Harihara Subramonia Iyer

Chalmers, Physics, Microstructure Physics

Mohammad Sattari

Chalmers, Physics, Microstructure Physics

Krystyna Marta Stiller

Chalmers, Physics, Microstructure Physics

Hans-Olof Andrén

Chalmers, Physics, Microstructure Physics

Pratik Lokhande

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Mattias Thuvander

Chalmers, Physics, Microstructure Physics

Journal of Nuclear Materials

0022-3115 (ISSN)

Vol. 549 152892

Superior Accident Tolerant Fuel via Enhanced Technology (SAFETY)

Swedish Foundation for Strategic Research (SSF), 2018-02-01 -- 2023-01-31.

Subject Categories

Manufacturing, Surface and Joining Technology

Metallurgy and Metallic Materials

Areas of Advance

Energy

Materials Science

Infrastructure

Chalmers Materials Analysis Laboratory

DOI

10.1016/j.jnucmat.2021.152892

More information

Latest update

4/6/2021 1