TY - JOUR
T1 - Formation of lamellar microstructure in Ti-48Al-7Nb-2.5V-1Cr alloy
AU - Yu, Yonghao
AU - Kou, Hongchao
AU - Yi Wang, William
AU - Wang, Yichao
AU - Qiang, Fengming
AU - Zou, Chengxiong
AU - Li, Jinshan
N1 - Publisher Copyright:
© 2022 The Author(s)
PY - 2022/12
Y1 - 2022/12
N2 - The reasonable design and application of phase transformation is an efficient approach to coordinate the microstructure and properties of alloys. The sequence of compositional and structural transformation determines the type and mechanism of phase transformation. Because of their low density and excellent high-temperature properties, TiAl alloys that contain fully lamellar microstructure have been applied to low-pressure turbine engine blades. However, there is no consensus on the mechanism of lamellar formation. Here, we propose a new mechanism that is dominated by spinodal decomposition, in which compositional transformation occurs prior to structural transformation during lamellar formation. Transitional lamellae with fcc-based long-period superstructures are introduced to prove the mechanism of sequentially spinodal decomposition, shear transformation, compositional modulation and ordering.
AB - The reasonable design and application of phase transformation is an efficient approach to coordinate the microstructure and properties of alloys. The sequence of compositional and structural transformation determines the type and mechanism of phase transformation. Because of their low density and excellent high-temperature properties, TiAl alloys that contain fully lamellar microstructure have been applied to low-pressure turbine engine blades. However, there is no consensus on the mechanism of lamellar formation. Here, we propose a new mechanism that is dominated by spinodal decomposition, in which compositional transformation occurs prior to structural transformation during lamellar formation. Transitional lamellae with fcc-based long-period superstructures are introduced to prove the mechanism of sequentially spinodal decomposition, shear transformation, compositional modulation and ordering.
KW - Compositional modulation
KW - Lamellar microstructure
KW - Long-period superstructure
KW - Spinodal decomposition
KW - TiAl alloy
UR - https://www.scopus.com/pages/publications/85141484165
U2 - 10.1016/j.matdes.2022.111342
DO - 10.1016/j.matdes.2022.111342
M3 - 文章
AN - SCOPUS:85141484165
SN - 0264-1275
VL - 224
JO - Materials and Design
JF - Materials and Design
M1 - 111342
ER -