The effect of precipitates on the superelastic response of [100] oriented FeMnAlNi single crystals under compression

abstract

• 2015 Acta Materialia Inc. 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 -196C to 240C. 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 200C 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.

authors

• Karaman, Ibrahim

published proceedings

• ACTA MATERIALIA

author list (cited authors)

• Tseng, L. W., Ma, J. i., Hornbuckle, B. C., Karaman, I., Thompson, G. B., Luo, Z. P., & Chumlyakov, Y. I.

citation count

• 80

complete list of authors

• Tseng, LW||Ma, Ji||Hornbuckle, BC||Karaman, I||Thompson, GB||Luo, ZP||Chumlyakov, YI

publication date

• September 2015

publisher

• Elsevier  Publisher

published in

• ACTA MATERIALIA  Journal

keywords

• Atom Probe Tomography
• B2 Precipitates
• Fe-based Shape Memory Alloys
• Superelasticity

Digital Object Identifier (DOI)

• 10.1016/j.actamat.2015.06.061

start page

• 234

end page

• 244

volume

• 97

URL

• http%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.actamat.2015.06.061