TY - GEN
T1 - Characteristic evolution of residual stress in shape memory Fe-Mn-Si-Cr alloys
AU - Suzuki, S.
AU - Kwon, E. P.
AU - Tanaka, S. I.
PY - 2014
Y1 - 2014
N2 - Since the matrix phase is transformed to martensitic phase in shape memory alloys (SMAs) during plastic deformation, complicated residual stresses may arise during deformation, and they may affect the shape recovery ability of the alloys. Thus, it is important to be able to characterize the residual stresses formed in SMAs during plastic deformation and annealing. In this study, X-ray diffraction was used to characterize the residual stress formed in a Fe-Mn-Si-Cr SMA, which was deformed in the tensile direction and subsequently annealed. The results showed that the compressive stress persisted in the tensile direction of the face-centered cubic (fcc) matrix upon tensile deformation and unloading. Compressive stress is believed to result from the hexagonal close-packed (hcp) phase formed during stress-induced martensitic transformation. After the deformed samples were annealed to recover their shapes, the residual stress was considerably reduced. This is believed to be due to the decrease in the formation of the hcp phase or to the recovery of their shapes during annealing. Our results indicated that residual stress in the fcc matrix phase is associated with the shape recovery characteristics of the alloys after martensitic and reverse martensitic transformations.
AB - Since the matrix phase is transformed to martensitic phase in shape memory alloys (SMAs) during plastic deformation, complicated residual stresses may arise during deformation, and they may affect the shape recovery ability of the alloys. Thus, it is important to be able to characterize the residual stresses formed in SMAs during plastic deformation and annealing. In this study, X-ray diffraction was used to characterize the residual stress formed in a Fe-Mn-Si-Cr SMA, which was deformed in the tensile direction and subsequently annealed. The results showed that the compressive stress persisted in the tensile direction of the face-centered cubic (fcc) matrix upon tensile deformation and unloading. Compressive stress is believed to result from the hexagonal close-packed (hcp) phase formed during stress-induced martensitic transformation. After the deformed samples were annealed to recover their shapes, the residual stress was considerably reduced. This is believed to be due to the decrease in the formation of the hcp phase or to the recovery of their shapes during annealing. Our results indicated that residual stress in the fcc matrix phase is associated with the shape recovery characteristics of the alloys after martensitic and reverse martensitic transformations.
KW - Fe-Mn-Si-Cr alloy
KW - Martensitic transformation
KW - Shape memory effect
UR - http://www.scopus.com/inward/record.url?scp=84886035629&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84886035629&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.768-769.374
DO - 10.4028/www.scientific.net/MSF.768-769.374
M3 - Conference contribution
AN - SCOPUS:84886035629
SN - 9783037858493
T3 - Materials Science Forum
SP - 374
EP - 379
BT - International Conference on Residual Stresses 9 (ICRS 9)
PB - Trans Tech Publications Ltd
T2 - 9th International Conference on Residual Stresses, ICRS 2012
Y2 - 7 October 2012 through 9 October 2012
ER -