TY - JOUR
T1 - Simultaneously achieving exceptional and heat treatment insensitive strength-ductility synergy in an α+β titanium alloy via tailoring silicide and heterogeneous α precipitates
AU - Dai, Jinhua
AU - Tang, Bin
AU - Wang, Chuanyun
AU - Fan, Yurong
AU - Wei, Beibei
AU - Wu, Jiaqi
AU - Wang, Yilei
AU - Chen, Xiaofei
AU - Zhang, Xiang
AU - Han, Yiheng
AU - Chen, Wentao
AU - Li, Jinshan
AU - Zhang, Pingxiang
N1 - Publisher Copyright:
© 2025
PY - 2025/11/20
Y1 - 2025/11/20
N2 - The development of cost-effective titanium alloys with outstanding mechanical properties has always been a primary concern of the modern aerospace industry. However, the intrinsic sensitivity of their α precipitates to heat treatments proliferates the manufacturing costs to achieve desirable strength and ductility, especially in engineering occasions. In current work, a silicide-containing α+β Ti-5Al-7.5V-0.5Mo-0.5Zr-0.5Si (TC5751S) alloy has been evidenced to exhibit advanced mechanical properties with reduced sensitivity to heat treatments. It is noted that more nano-scale secondary α (αs) precipitate with a simultaneous dissolution in micron-scale primary α (αp) and (Ti, Zr)5Si3 silicides in the current alloy as the solution temperature increases. However, this alloy shows excellent and stabilized strength-ductility synergy in all cases (ultimate tensile strength: 1335±30 MPa, yield strength: 1245±30 MPa, fracture strain: 9.6 %±0.5 %) irrespective of the aforementioned variations in the microstructure. This stabilized strength and ductility of TC5751S are rationalized based on the compensation mechanisms between the contributions from silicide and heterogeneous α precipitates. The quantitative analysis unveils that the increased αs/β phase boundary strengthening (σPB) is approximately offset by the decrease in silicide strengthening (σsilicide) due to silicide dissolution with increasing solution temperatures, leading to the strength of TC5751S in a dynamic equilibrium state. Simultaneously, the dissolution of silicides reduces the cracking tendency and complements the ductility loss due to αp reduction and αs precipitation, leading to the ductility insensitive to heat treatments. Therefore, the compensating role of silicides to the effects of heterogeneous α precipitates on both the strength and ductility of titanium alloys has been well-verified in our work, providing a novel pathway to the development of high-performance titanium alloys friendly to processing strategies.
AB - The development of cost-effective titanium alloys with outstanding mechanical properties has always been a primary concern of the modern aerospace industry. However, the intrinsic sensitivity of their α precipitates to heat treatments proliferates the manufacturing costs to achieve desirable strength and ductility, especially in engineering occasions. In current work, a silicide-containing α+β Ti-5Al-7.5V-0.5Mo-0.5Zr-0.5Si (TC5751S) alloy has been evidenced to exhibit advanced mechanical properties with reduced sensitivity to heat treatments. It is noted that more nano-scale secondary α (αs) precipitate with a simultaneous dissolution in micron-scale primary α (αp) and (Ti, Zr)5Si3 silicides in the current alloy as the solution temperature increases. However, this alloy shows excellent and stabilized strength-ductility synergy in all cases (ultimate tensile strength: 1335±30 MPa, yield strength: 1245±30 MPa, fracture strain: 9.6 %±0.5 %) irrespective of the aforementioned variations in the microstructure. This stabilized strength and ductility of TC5751S are rationalized based on the compensation mechanisms between the contributions from silicide and heterogeneous α precipitates. The quantitative analysis unveils that the increased αs/β phase boundary strengthening (σPB) is approximately offset by the decrease in silicide strengthening (σsilicide) due to silicide dissolution with increasing solution temperatures, leading to the strength of TC5751S in a dynamic equilibrium state. Simultaneously, the dissolution of silicides reduces the cracking tendency and complements the ductility loss due to αp reduction and αs precipitation, leading to the ductility insensitive to heat treatments. Therefore, the compensating role of silicides to the effects of heterogeneous α precipitates on both the strength and ductility of titanium alloys has been well-verified in our work, providing a novel pathway to the development of high-performance titanium alloys friendly to processing strategies.
KW - Ductility
KW - Heat treatment sensitivity
KW - Microstructure
KW - Silicide
KW - Strengthening mechanism
KW - Titanium alloy
UR - http://www.scopus.com/inward/record.url?scp=105002917616&partnerID=8YFLogxK
U2 - 10.1016/j.jmst.2025.01.072
DO - 10.1016/j.jmst.2025.01.072
M3 - 文章
AN - SCOPUS:105002917616
SN - 1005-0302
VL - 236
SP - 51
EP - 66
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -