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The Influence of α′ (bcc) Martensite on the Dynamic and Magnetic Response of Powder Metallurgy FeMnSiCrNi Shape Memory Alloys

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Proceedings of the International Conference on Martensitic Transformations: Chicago

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

In FeMnSi-based SMAs the “executive” phase is ε (hexagonal close packed, hcp) stress induced martensite which retransforms to γ (face center cubic, fcc) austenite during heating, causing free-recovery shape memory effect (SME). At low Mn content or high deformation degrees, α′ (body center cubic, bcc) martensite can be additionally induced by cooling or deformation, being considered as detrimental for the magnitude of SME. In the case of powder metallurgy (PM) Fe-14Mn-6Si-9Cr-5Ni (wt%) SMAs containing 5 fractions of mechanically alloyed (MA’ed) powders (0–40%vol.) solution treated to 5 temperatures (700–1100 °C), large amounts, (20–90%) of α′-bcc martensite were detected by XRD and observed by SEM. Nevertheless, free-recovery SME was obtained and enhanced by training, up to bending strokes of 24 mm, developed with a rate of 1.71 mm/°C. The paper corroborates the qualitative and quantitative evolutions of α′, ε and γ phases with DMA and thermomagnetic measurements performed on the 25 sets of specimens, during heating up to 500 °C.

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Acknowledgements

This research was supported by UEFISCDI through project code PN II-PT - PCE-2012-4-0033, Contract 13/2013.

Ministry of Research and Innovation, NUCLEU programme, PN 16370201 project is highly acknowledged.

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Authors and Affiliations

  1. Faculty of Materials Science and Engineering, The “Gheorghe Asachi” Technical University of Iaşi, Blvd. Dimitrie Mangeron 67, 700050, Iaşi, Romania

    M. Mocanu, E. Mihalache, B. Pricop, R. I. Comăneci & L. G. Bujoreanu

  2. National Institute of Research and Development for Technical Physics, Blvd. Dimitrie Mangeron 47, 700050, Iaşi, Romania

    F. Borza & M. Grigoraș

  3. Particulate Materials Laboratory, Metallurgical and Materials Engineering Department, Istanbul Technical University, 34469, Maslak, Turkey

    B. Özkal

Authors
  1. M. Mocanu
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  2. E. Mihalache
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  3. B. Pricop
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  4. F. Borza
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  5. M. Grigoraș
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  6. R. I. Comăneci
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  7. B. Özkal
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  8. L. G. Bujoreanu
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Corresponding author

Correspondence to L. G. Bujoreanu .

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Editors and Affiliations

  1. Colorado School of Mines, Golden, Colorado, USA

    Aaron P. Stebner

  2. Northwestern University, Evanston, Illinois, USA

    Gregory B. Olson

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Mocanu, M. et al. (2018). The Influence of α′ (bcc) Martensite on the Dynamic and Magnetic Response of Powder Metallurgy FeMnSiCrNi Shape Memory Alloys. In: Stebner, A., Olson, G. (eds) Proceedings of the International Conference on Martensitic Transformations: Chicago. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-76968-4_16

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