Microstructure Development in Additive Friction Stir-Deposited Cu
- Resource Type
- Authors
- Brett E. Tucker Roper; Paul G. Allison; Kristopher A. Darling; Jonathan L. Priedeman; Gregory B. Thompson; Jessica J. Lopez; J. Brian Jordon; B.J. Phillips; B. Chad Hornbuckle
- Source
- Metals, Vol 10, Iss 1538, p 1538 (2020)
Metals
Volume 10
Issue 11
- Subject
- lcsh:TN1-997
Materials science
recrystallization
microstructure
chemistry.chemical_element
02 engineering and technology
Work hardening
additive friction stir-deposition
01 natural sciences
metals and alloys
0103 physical sciences
General Materials Science
Composite material
Porosity
indentation and hardness
lcsh:Mining engineering. Metallurgy
010302 applied physics
Recrystallization (metallurgy)
021001 nanoscience & nanotechnology
Microstructure
Copper
Grain size
chemistry
Vickers hardness test
0210 nano-technology
Crystal twinning
- Language
- English
- ISSN
- 2075-4701
This work details the additive friction stir-deposition (AFS-D) of copper and evaluation of its microstructure evolution and hardness. During deposition, a surface oxide is formed on the deposit exterior. A very fine porosity is formed at the substrate&ndash
deposit interface. The deposit (four layers of 1 mm nominal height) is otherwise fully dense. The grains appear to have recrystallized throughout the deposit with varying levels of refinement. The prevalence of twinning was found to be dependent upon the grain size, with larger local grain sizes having a higher number of twins. Vickers hardness measurements reveal that the deposit is softer than the starting feedstock. This result indicates that grain refinement and/or higher twin densities do not replace work hardening contributions to strengthen Cu processed by additive friction stir-deposition.