Characterization of bulk bimodal polycrystalline nickel deformed by direct impact loadings

G. Dirras, D. Tingaud, G. Csiszár, J. Gubicza, H. Couque, F. Mompiou

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Spark plasma sintering of a blend of powders with nanometer and micrometer sized particles yielded to a composite-like nickel microstructure consisting of ultrafine-grained (UFG) and coarse-grained (CG) volumes with the fractions of 36% and 64%, respectively. Microstructure evolution and nanohardness distributions of specimens submitted to impact loading at various velocities between 12 and 50ms-1 were determined. At a velocity of 12ms-1, cracks were formed in the UFG regions but they were stopped by the CG entities. Higher velocities resulted in crack-free microstructures and considerable grain fragmentation within CG regions. X-ray line profile analysis investigations showed a decrease of mean crystallite size from ~104 (initial state) to ~41nm (highest velocity). The dislocation density first increased up to 20ms-1 then it decreased considerably with increasing impact velocity, indicating recovery in the microstructure due to the conversion of plastic work into heat. Accordingly, the average nanohardness decreased with increasing the velocity from 20 to 31ms-1. No difference between the microstructures impacted at 31 and 50ms-1 was observed.

Original languageEnglish
Pages (from-to)48-57
Number of pages10
JournalMaterials Science and Engineering A
Volume601
DOIs
Publication statusPublished - Apr 17 2014

Fingerprint

Nickel
nickel
microstructure
Microstructure
Nanohardness
cracks
impact velocity
Cracks
sparks
Spark plasma sintering
Crystallite size
micrometers
sintering
fragmentation
plastics
Powders
recovery
heat
composite materials
Plastics

Keywords

  • Bimodal microstructure
  • Dislocations
  • Impact
  • Nanohardness
  • Nickel
  • Spark plasma sintering

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Characterization of bulk bimodal polycrystalline nickel deformed by direct impact loadings. / Dirras, G.; Tingaud, D.; Csiszár, G.; Gubicza, J.; Couque, H.; Mompiou, F.

In: Materials Science and Engineering A, Vol. 601, 17.04.2014, p. 48-57.

Research output: Contribution to journalArticle

Dirras, G. ; Tingaud, D. ; Csiszár, G. ; Gubicza, J. ; Couque, H. ; Mompiou, F. / Characterization of bulk bimodal polycrystalline nickel deformed by direct impact loadings. In: Materials Science and Engineering A. 2014 ; Vol. 601. pp. 48-57.
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