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 degrees C to 240 degrees C. In this work, we investigated the effect of B2 nanoprecipitates on the superelastic characteristics of [100] 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 degrees 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. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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Texas A&M Univ, Dept Mech Engn, MS 3123, College Stn, TX 77843 USATexas A&M Univ, Dept Mech Engn, MS 3123, College Stn, TX 77843 USA
Tseng, L. W.
Ma, Ji
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Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USATexas A&M Univ, Dept Mech Engn, MS 3123, College Stn, TX 77843 USA
Ma, Ji
Vollmer, M.
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Univ Kassel, Inst Werkstofftech Mat Engn, D-34125 Kassel, GermanyTexas A&M Univ, Dept Mech Engn, MS 3123, College Stn, TX 77843 USA
Vollmer, M.
Krooss, P.
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Univ Kassel, Inst Werkstofftech Mat Engn, D-34125 Kassel, GermanyTexas A&M Univ, Dept Mech Engn, MS 3123, College Stn, TX 77843 USA
Krooss, P.
Niendorf, T.
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Univ Kassel, Inst Werkstofftech Mat Engn, D-34125 Kassel, GermanyTexas A&M Univ, Dept Mech Engn, MS 3123, College Stn, TX 77843 USA
Niendorf, T.
Karaman, I.
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Texas A&M Univ, Dept Mech Engn, MS 3123, College Stn, TX 77843 USA
Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USATexas A&M Univ, Dept Mech Engn, MS 3123, College Stn, TX 77843 USA