The effect of precipitates on the superelastic response of [1 0 0] oriented FeMnAlNi single crystals under compression

L. W. Tseng, Ji Ma, B. C. Hornbuckle, I. Karaman, G. B. Thompson, Z. P. Luo, Y. I. Chumlyakov

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Abstract

Abstract FeMnAlNi shape memory alloys were recently discovered to have a small temperature dependence of the superelastic critical stress in a large superelastic temperature window from -196°C to 240°C. In this work, we investigated the effect of B2 nanoprecipitates on the superelastic characteristics of [1 0 0] oriented Fe43.5Mn34Al15Ni7.5 single crystals under compression, and found that the size, volume fraction and composition of precipitates strongly influence the transformation temperature, superelastic strain, critical stress for stress-induced martensitic transformation and stress hysteresis of the single crystals. The single crystals aged at 200°C for 3 h show 7.2% superelastic strain with the precipitate size of about 6-10 nm. Longer aging times or higher aging temperature reduces superelastic recovery due to the coarsening of the precipitates.

Original languageEnglish
Article number12246
Pages (from-to)234-244
Number of pages11
JournalActa Materialia
Volume97
DOIs
Publication statusPublished - 2015 Jul 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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