Compaction behavior of water-atomized CoCrFeMnNi high-entropy alloy powders

• Published in: Materials chemistry and physics Vol. 210; pp. 95 - 102
• Main Authors: Yim, Dami, Jang, Min Ji, Bae, Jae Wung, Moon, Jongun, Lee, Chul-Hee, Hong, Soon-Jik, Hong, Sun Ig, Kim, Hyoung Seop
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.05.2018; Elsevier BV
• Subjects: Alloy powders; Alloys; Atomizing; Compaction; Constitutive models; Deformation resistance; Dendritic structure; Densification; Dislocation density; Entropy; High entropy alloy; High entropy alloys; Powder metallurgy; Pressure dependence; Strain hardening; Tap density; Dislocation density; Compaction; High entropy alloy; Powder metallurgy
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2017.06.013

In this work, compaction behavior of CoCrFeMnNi high-entropy alloy powders with various particle sizes and size distributions, produced by water atomization, was investigated experimentally and theoretically. Theoretical modeling was employed using a pressure-dependent yield function in associated with a phenomenological constitutive model. Results for the quantitative densification behaviors from the experimental and theoretical analyses are in good agreement. We found that the size and size-distribution of the powder particles are important factors in the tap density as with conventional powder compaction. The compact density of large powder particles with coarse dendrite arm spacing is high due to low deformation resistance and low strain hardening (i.e., low evolution of dislocation density). [Display omitted] •The compaction behavior of CoCrFeMnNi high-entropy alloy powders of various sizes is studied.•The size and size-distribution of the powder particles are important factors in the tap density.•The strength of the matrix is the factor governing the final compact density.•The simulation densification behaviors are in good agreement with experimental ones.