Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 856, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.157869
Keywords
-
Categories
Funding
- Direction Generale de l'Armement
Ask authors/readers for more resources
Starting from micrometric pure nickel powder, high-energy ball milling process and Spark Plasma Sintering technique allow the production of dense nanostructured materials. Milling under argon confinement limits the surface oxidation of particles, providing a nanostructured dense material with a significant improvement of true ductility.
Starting from micrometric pure nickel powder, high-energy ball milling process allows to produce nanostructured agglomerate powders associated with both a decrease of crystallite size and an increase of structural defects. With the help of a fast sintering process, such as the Spark Plasma Sintering technique, dense nanostructured materials can be elaborated. However, a drawback of this approach concerns the powder oxidation preventing the development of a perfectly densifled metallic material. A study was conducted on the oxidation characteristics of nickel powders revealing a significant oxidation during milling process not only on the surface but, also, inside the agglomerated particle powder. The origin of oxygen contamination has been identified by thermogravimetric and X-ray photoelectron spectrometer analyses. It was found that achieving the milling under argon confinement makes it possible to limit the surface oxidation of particles. A best compromise between mechanical activation (i.e. reactivity) and powder contamination was obtained under argon atmosphere with slow rotation speeds of the plate and bowls composing the planetary mill. Such condition provides a nanostructured dense material with a significant improvement of the true ductility (c increase from 28 to 38%) without a limited reduction of the mechanical tensile strength (Rm decrease from 740 to 720 MPa). (C) 2020 Published by Elsevier B.V.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available