TY - JOUR
T1 - An atomic study of substructures formed by shear transformation in cast γ -TiAl
AU - Zhang, Hanlei
AU - Kou, Hongchao
AU - Li, Xiaolei
AU - Tang, Bin
AU - Li, Jinshan
N1 - Publisher Copyright:
© 2015 Hanlei Zhang et al.
PY - 2015
Y1 - 2015
N2 - Substructures and microsegregation of γ/γ laths are analyzed with HRTEM and HAADF-STEM. Results show that the substructures are generated during evolution of shear transformation on the (111-) plane of γ lath. At the beginning, shear transformation evolves in a single γ lath, and a superstructure intrinsic stacking fault (SISF) forms in the γ lath. After the formation of the SISF, the shear transformation may evolve in two different ways. If the shear transformation evolves into neighboring γ laths, the SISF also penetrates into neighboring γ laths and a ribbon of SISFs forms. If shear transformation continues to evolve in the original lath, complex substructures begin to form in the original. If shear transformation in the original lath is homogeneous and complete, secondary twin forms which may further grow into twin intersection. Incomplete shear transformation could not form secondary twins but generates a high concentration of planar faults on the (111¯) plane. These planar faults may further penetrate the γ/γ lath interface, grow into adjacent laths, and form a ribbon of planar faults.
AB - Substructures and microsegregation of γ/γ laths are analyzed with HRTEM and HAADF-STEM. Results show that the substructures are generated during evolution of shear transformation on the (111-) plane of γ lath. At the beginning, shear transformation evolves in a single γ lath, and a superstructure intrinsic stacking fault (SISF) forms in the γ lath. After the formation of the SISF, the shear transformation may evolve in two different ways. If the shear transformation evolves into neighboring γ laths, the SISF also penetrates into neighboring γ laths and a ribbon of SISFs forms. If shear transformation continues to evolve in the original lath, complex substructures begin to form in the original. If shear transformation in the original lath is homogeneous and complete, secondary twin forms which may further grow into twin intersection. Incomplete shear transformation could not form secondary twins but generates a high concentration of planar faults on the (111¯) plane. These planar faults may further penetrate the γ/γ lath interface, grow into adjacent laths, and form a ribbon of planar faults.
UR - http://www.scopus.com/inward/record.url?scp=84930958503&partnerID=8YFLogxK
U2 - 10.1155/2015/675963
DO - 10.1155/2015/675963
M3 - 文章
AN - SCOPUS:84930958503
SN - 1687-8434
VL - 2015
JO - Advances in Materials Science and Engineering
JF - Advances in Materials Science and Engineering
M1 - 675963
ER -