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Journal of Materials Science

, Volume 48, Issue 13, pp 4613–4619 | Cite as

Evolution of a martensitic structure in a Cu–Al alloy during processing by high-pressure torsion

  • G. F. Zhang
  • X. Sauvage
  • J. T. WangEmail author
  • N. Gao
  • T. G. Langdon
Nanostructured Materials

Abstract

A Cu-11.8 wt% Al alloy was quenched in iced water from a high temperature (850 °C) to introduce a martensitic phase and then the alloy was processed using quasi-constrained high-pressure torsion (HPT). The micro-hardness and the microstructures of the unprocessed and severely deformed materials were investigated using a wide range of experimental techniques (X-ray diffraction, optical microscopy, scanning electron microscopy, transmission electron microscopy, and high- resolution TEM). During HPT, a stress-induced martensite–martensite transformation occurs and an \( \alpha^{\prime}_{1} \) martensite phase is formed. In the deformed material, there are nanoscale deformation bands having high densities of defects and twins in the \( \alpha^{\prime}_{1} \) martensite. It was observed that a high density of dislocations became pinned and accumulated in the vicinity of twin boundaries, thereby demonstrating a strong interaction between twin boundaries and dislocations during the HPT process.

Keywords

Martensite HRTEM Severe Plastic Deformation Twin Boundary Deformation Twin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This study was supported by the Ministry of Science and Technology of China under Grant No. 2012CB932203 of the National Key Basic Research Program and by the Royal Society of the UK under International Joint Project No. JP871294. GFZ is grateful to the Xu Guangqi program 2009 and the 3rd scholarship program of NUST for providing an opportunity to study in the University of Rouen, Groupe de Physique des Matériaux, CNRS (UMR 6634), supervised by Dr. Xavier Sauvage for 6 months. Thanks are due to Chuanting Wang for HPT processing of the samples.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • G. F. Zhang
    • 1
  • X. Sauvage
    • 2
  • J. T. Wang
    • 1
    Email author
  • N. Gao
    • 3
  • T. G. Langdon
    • 3
    • 4
  1. 1.School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjingPeople’s Republic of China
  2. 2.Groupe de Physique des Matériaux, CNRS (UMR 6634)University of RouenSaint-EtienneFrance
  3. 3.Materials Research Group, Faculty of Engineering and the EnvironmentUniversity of SouthamptonSouthamptonUK
  4. 4.Departments of Aerospace & Mechanical Engineering and Materials ScienceUniversity of Southern CaliforniaLos AngelesUSA

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