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

  • M. Mocanu
  • E. Mihalache
  • B. Pricop
  • F. Borza
  • M. Grigoraș
  • R. I. Comăneci
  • B. Özkal
  • L. G. Bujoreanu
Conference paper
Part of the The Minerals, Metals & Materials Series book 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.

Keywords

FeMnSiCrNi SMA Martensite Structural analysis Dynamic mechanical analysis Thermomagnetic analysis 

Notes

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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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • M. Mocanu
    • 1
  • E. Mihalache
    • 1
  • B. Pricop
    • 1
  • F. Borza
    • 2
  • M. Grigoraș
    • 2
  • R. I. Comăneci
    • 1
  • B. Özkal
    • 3
  • L. G. Bujoreanu
    • 1
  1. 1.Faculty of Materials Science and EngineeringThe “Gheorghe Asachi” Technical University of IaşiIaşiRomania
  2. 2.National Institute of Research and Development for Technical PhysicsIaşiRomania
  3. 3.Particulate Materials Laboratory, Metallurgical and Materials Engineering DepartmentIstanbul Technical UniversityMaslakTurkey

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