TY - JOUR
T1 - Effect of different stages of deformation on the microstructure evolution of Ti-rich NiTi shape memory alloy
AU - Tadayyon, Ghazal
AU - Guo, Yina
AU - Mazinani, Mohammad
AU - Zebarjad, Seyed Mojtaba
AU - Tiernan, Peter
AU - Tofail, Syed A.M.
AU - Biggs, Manus J.P.
N1 - Publisher Copyright:
© 2017 Elsevier Inc.
PY - 2017/3/1
Y1 - 2017/3/1
N2 - The main objective of this work was to investigate the thermomechanical behavior and microstructural changes of a Ti-rich NiTi shape memory alloy (SMA). The microstructural and texture evolution of aged NiTi alloy at different degrees of deformation were elicited by transmission electron microscopy (TEM). An effort was made to correlate results obtained from the tensile test with results from microstructure studies. The undeformed sample reveals a self-accommodated morphology with straight and well defined twin boundaries. At different stages of deformation, diverse mechanisms were involved. These mechanisms include marstraining, detwinning accompanied by dislocation movement, and finally, severe plastic deformation, subdivision and amorphization of the matrix. Under increasing strains, high density lattice defects were generated and the morphology of B19’ became disordered.
AB - The main objective of this work was to investigate the thermomechanical behavior and microstructural changes of a Ti-rich NiTi shape memory alloy (SMA). The microstructural and texture evolution of aged NiTi alloy at different degrees of deformation were elicited by transmission electron microscopy (TEM). An effort was made to correlate results obtained from the tensile test with results from microstructure studies. The undeformed sample reveals a self-accommodated morphology with straight and well defined twin boundaries. At different stages of deformation, diverse mechanisms were involved. These mechanisms include marstraining, detwinning accompanied by dislocation movement, and finally, severe plastic deformation, subdivision and amorphization of the matrix. Under increasing strains, high density lattice defects were generated and the morphology of B19’ became disordered.
KW - Detwinning
KW - NiTi shape memory alloys
KW - Plastic deformation mechanisms
KW - Strain burst
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=85010672880&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2017.01.024
DO - 10.1016/j.matchar.2017.01.024
M3 - Article
AN - SCOPUS:85010672880
SN - 1044-5803
VL - 125
SP - 51
EP - 66
JO - Materials Characterization
JF - Materials Characterization
ER -