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Journal of Materials Science

, Volume 54, Issue 5, pp 4354–4365 | Cite as

Study of the microstructure and texture heterogeneities of Fe–48wt%Ni alloy severely deformed by equal channel angular pressing

  • Rabeb Lachhab
  • Mohamed Ali Rekik
  • Hiba Azzeddine
  • Thierry Baudin
  • Anne-Laure Helbert
  • François Brisset
  • Mohamed Khitouni
Metals
  • 46 Downloads

Abstract

A Fe–48wt%Ni alloy was processed by severe plastic deformation using equal channel angular pressing process. A stacking of 9 sheets was introduced and pressed up to two passes into die with an inner angle of Φ = 90º and outer arc of curvature ψ = 17° at room temperature following route A. The same material in bulk form was also ECAPed up to one pass. The microstructure and the texture were investigated by means of electron backscattered diffraction and X-ray diffraction, respectively. To evaluate the mechanical response, Vickers microhardness was carried out. The given analyses concern the as-received sample, the peripheral and the central plates of the pressed stacks and the upper, the middle and the lower parts of the pressed bulk material. The deformation was heterogeneous, and variations in texture and microstructure, resulting from different efficiencies in the shearing process, were locally noted. For the stacks samples, the microstructure evolved from equiaxed grains of 9 μm with high fraction of high-angle grain boundaries (around 90%) to a heterogeneous fine grain structure with an average grain size of 3 μm after two passes. On the contrary, for the bulk sample, the evolution was to a banded structure after one pass. Results of mechanical property show that microhardness increased significantly from 147 Hv before deformation to mean values of 244 (after one pass) and 235 Hv (after two passes) for the bulk and stacked samples, respectively. The Hall–Petch effect and dislocation density were evaluated as most responsible in material strengthening.

Notes

Acknowledgements

This work was supported by the PHC-Maghreb program No. 16MAG03. Authors would like to thank R. Batonnet, Y. Ateba Betanda and T. Waeckerlé from Aperam alloys Imphy society, France, for providing the Fe–48%Ni (wt%) alloy.

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Laboratoire de Chimie Inorganique Ur-11-Es-73Faculté des sciences de SfaxSfaxTunisie
  2. 2.Faculté de PhysiqueUniversité des Sciences et de la Technologie Houari BoumedieneBab EzzouarAlgérie
  3. 3.Département de PhysiqueUniversité de Mohamed BoudiafM’silaAlgérie
  4. 4.ICMMO, SP2M, UMR CNRS 8182Univ. Paris-Sud, Université Paris-SaclayOrsay CedexFrance

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