Metallurgical and Materials Transactions A

, Volume 44, Issue 9, pp 4310–4322 | Cite as

Microstructural Developments Through Marforming in a Ni-Ti-Fe Shape Memory Alloy

  • R. Basu
  • L. Jain
  • B. C. Maji
  • M. Krishnan
  • I. Samajdar
Article
First Online:

Abstract

A hot-rolled Ni-Ti-Fe alloy was subjected to marforming: approximately 8 pct reduction (in thickness) in the martensite phase by laboratory rolling. Before the next marforming step, the sample was annealed to bring back calorimetric signatures of reversible austenite-martensite phase transformation. Significant differences in microstructure could be achieved by combinations of marforming and annealing. Such differences, on the other hand, originated from the marformed microstructure: two distinct regions of remarkably different substructures. The difference was mainly through the relative presence of defects: micro-twins and dislocations. The regions of lower defect densities got textured gradually, with marforming steps, to γ (ND//〈111〉) fiber. The regions with high defect densities, on the other hand, provided non-γ fine clustered grains after annealing. Though debates may continue on the exact nature and origin of micro-twins, the present study brought out their dominant role in determining almost all aspects of microstructural developments.

Keywords

Austenite Martensite Residual Stress Shape Memory Alloy Austenite Phase 
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.
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Notes

Acknowledgments

Support from the Department of Science and Technology and National Facility of Texture and Orientation Imaging Microscopy (OIM) is appreciated. A special mention needs to be made of the key reader and the two reviewers of this manuscript. Their appreciation for the results and careful/meticulous review have indeed improved the quality/readability of this manuscript.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2013

Authors and Affiliations

  • R. Basu
    • 1
    • 2
  • L. Jain
    • 1
  • B. C. Maji
    • 3
  • M. Krishnan
    • 3
  • I. Samajdar
    • 1
  1. 1.Department of Metallurgical Engineering and Materials ScienceIndian Institute of Technology BombayMumbaiIndia
  2. 2.Oxford Instruments India Pvt. Ltd.MumbaiIndia
  3. 3.Bhabha Atomic Research CenterMumbaiIndia

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