Ultrafine-grained nickel refined by dislocation activities at intermediate strain rate impact: Deformation microstructure and mechanical properties

L. Farbaniec, A. Abdul-Latif, J. Gubicza, G. Dirras

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This article presents an application of the impact-induced deformation in effective grain refinement in polycrystalline nickel. Ultrafine-grained microstructure was processed by means of Dynamic Plastic Deformation at room temperature using a falling impactor with a maximum impact velocity of 10 m s -1. The commercially pure (98.4 wt%) starting material was characterised by a coarsegrained (∼25 μm) microstructure. Electron backscattering diffraction and transmission electron microscopy studies showed that the initial equiaxed grains evolved into a laminar structure of submicron size narrow domains delineated by high-angle grain boundaries. The texture after deformation exhibits preferential orientations including a strong 220 fibre texture. The mechanical behaviour under quasi-static compression at room temperature and at a strain rate of 2 9 10 -3 s -1 was investigated in directions parallel and perpendicular to the impact axis. Stress-strain responses showed an increased yield strength (440-520 MPa) compared with the initial state (90 MPa). The strainhardening behaviour was found to strongly depend on the orientation of the compression axis.

Original languageEnglish
Pages (from-to)7932-7938
Number of pages7
JournalJournal of Materials Science
Volume47
Issue number22
DOIs
Publication statusPublished - Nov 2012

Fingerprint

Nickel
Strain rate
Textures
Mechanical properties
Microstructure
Grain refinement
Backscattering
Yield stress
Plastic deformation
Grain boundaries
Diffraction
Transmission electron microscopy
Temperature
Electrons
Fibers
Ultrafine
Direction compound

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Ultrafine-grained nickel refined by dislocation activities at intermediate strain rate impact : Deformation microstructure and mechanical properties. / Farbaniec, L.; Abdul-Latif, A.; Gubicza, J.; Dirras, G.

In: Journal of Materials Science, Vol. 47, No. 22, 11.2012, p. 7932-7938.

Research output: Contribution to journalArticle

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