Effects of crystallographic orientation on the superelastic response of FeMnAlNi single crystals
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2016 Elsevier B.V. All rights reserved. The effects of crystal orientation on the tensile superelastic response of the Fe43.5Mn34Al15Ni7.5 single crystalline shape memory alloy, oriented along the < 100 > and < 123 > directions were investigated. The single crystals aged at 200 C for 3 h demonstrated superelastic strains of 3.6% along the < 100 > orientation and 7.8% along the < 123 > orientation. Although the theoretical transformation strain in the < 100 > orientation is higher than that in the < 123 > orientation, the < 123 > oriented single crystals demonstrate better superelastic recovery in tension due to a higher number of active martensite variants, which promote better accommodation of internal strains and help minimize defect formation during transformation.