TY - JOUR
T1 - Interface evolution mechanism and mechanical properties of Ti311/TC4 laminated composites during hot-pressing diffusion bonding
AU - Yuan, Jingjiu
AU - Fan, Qunbo
AU - Liu, Weifeng
AU - Xu, Shun
AU - Yang, Lin
AU - Cheng, Xingwang
AU - Zhang, Hongmei
AU - Yan, Qianyun
AU - Wang, Le
AU - Zhang, Junjie
N1 - Publisher Copyright:
© 2024 Elsevier Inc.
PY - 2024/5
Y1 - 2024/5
N2 - The dual-hardness titanium alloy laminated composites exhibit high hardness and toughness, making it an ideal material for applications in ballistic protection, wear-resistant and other fields. However, the substantial difference in hardness poses a challenge in effectively bonding these alloys, potentially resulting in the emergence of cracks and a decrease in bonding strength. In this study, a new Ti5Si3-reinforced high-hardness Ti311 (475 HV) and TC4 (352 HV) titanium alloys were successfully combined by hot-pressing diffusion bonding. The synergy effects of hot-pressing temperature and deformation on the microstructural evolution and mechanical properties of the Ti311/TC4 interface were systematically studied. The metallurgical bonding interface was formed at 850 °C under 25 MPa of 15.9% deformation, with the maximum shear strength value of 606 MPa. Moreover, a continuous and discontinuous coupled dynamic recrystallization mechanism was revealed. Deformed α grains were transformed to fine recrystallized grains, and gradually grew with the help of continuous dynamic recrystallization to eliminate the original flat interface. In addition, with the occurrence of element diffusion, the interface between Ti311 and TC4 is ultimately successfully bonded. Notably, the Ti5Si3 phase played a double-edge sword effect on bonding the Ti311/TC4 interface, promoting the occurrence of continuous dynamic recrystallization of adjacent α phase in TC4, but having negative effects on element diffusion.
AB - The dual-hardness titanium alloy laminated composites exhibit high hardness and toughness, making it an ideal material for applications in ballistic protection, wear-resistant and other fields. However, the substantial difference in hardness poses a challenge in effectively bonding these alloys, potentially resulting in the emergence of cracks and a decrease in bonding strength. In this study, a new Ti5Si3-reinforced high-hardness Ti311 (475 HV) and TC4 (352 HV) titanium alloys were successfully combined by hot-pressing diffusion bonding. The synergy effects of hot-pressing temperature and deformation on the microstructural evolution and mechanical properties of the Ti311/TC4 interface were systematically studied. The metallurgical bonding interface was formed at 850 °C under 25 MPa of 15.9% deformation, with the maximum shear strength value of 606 MPa. Moreover, a continuous and discontinuous coupled dynamic recrystallization mechanism was revealed. Deformed α grains were transformed to fine recrystallized grains, and gradually grew with the help of continuous dynamic recrystallization to eliminate the original flat interface. In addition, with the occurrence of element diffusion, the interface between Ti311 and TC4 is ultimately successfully bonded. Notably, the Ti5Si3 phase played a double-edge sword effect on bonding the Ti311/TC4 interface, promoting the occurrence of continuous dynamic recrystallization of adjacent α phase in TC4, but having negative effects on element diffusion.
KW - Bonding interface
KW - Diffusion bonding
KW - Microstructure
KW - Titanium alloys
UR - http://www.scopus.com/inward/record.url?scp=85189937206&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2024.113900
DO - 10.1016/j.matchar.2024.113900
M3 - Article
AN - SCOPUS:85189937206
SN - 1044-5803
VL - 211
JO - Materials Characterization
JF - Materials Characterization
M1 - 113900
ER -