Tailoring powder strengths for enhanced quality of cold sprayed Al6061 deposits

Huang, Chunjie; List, Alexander; Shen, Junjun; Fu, Banglong; Yin, Shuo; Chen, Ting; Klusemann, Benjamin; Gärtner, Frank; Klassen, Thomas

doi:10.1016/j.matdes.2022.110494

Tailoring powder strengths for enhanced quality of cold sprayed Al6061 deposits

Publication date

2022-02-28

Document type

Forschungsartikel

Author

Huang, Chunjie

List, Alexander

Shen, Junjun

Fu, Banglong

Yin, Shuo

Chen, Ting

Klusemann, Benjamin

Gärtner, Frank

Klassen, Thomas

Organisational unit

Werkstoffkunde

DOI

10.1016/j.matdes.2022.110494

URI

https://openhsu.ub.hsu-hh.de/handle/10.24405/17761

Publisher

Elsevier Science

Series or journal

Materials and Design

ISSN

0264-1275

Periodical volume

215

Article ID

110494

Peer-reviewed

✅

Part of the university bibliography

✅

Funding(s)

Publikationsfonds der HSU/UniBw H

Language

English

Keyword

Cold spraying

Al6061 powder treatment

Spraying parameters

Microstructural homogenization

Deposit mechanical properties

Single-particle adhesion

Abstract

As verified by literature, heat-treatments of as-atomized Al-alloy powders before cold spraying, result in microstructural homogenization and deposition efficiency increment. So far, a straightforward correlation between powder strength and consequences for the performance in cold spraying and deposit properties is still missing. This work thus provides reliable analyses of powder strengths in as-atomized and annealed states to the calculation of critical velocities and deposit quality parameter η, as well as the associated influences of powder strength on single-particle adhesion and deposit microstructures and properties. By annealing of as-atomized powder, its strength is reduced by about 60%, which allows decreasing the critical velocity for a successful deposition. Experimental results demonstrate that powder strength-based calculation of quality parameter η allows for a more realistic description of microstructural characteristics and deposits properties. The single-particle impact morphologies as well as the detachment features of adhering splats by cavitation tests visualize the respective deposition characteristics and bonding behaviors. The lower critical velocities by annealing contribute to better single splat adhesion, lower porosity, higher electrical conductivity, as well as improved tensile strength of deposits. The direct correlation of powder pre-annealing and strength in combination with cold spraying parameter variation allows defining effective strategies for improving deposit properties.

Description

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Version

Published version

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Metadata only access