TY - JOUR
T1 - Evolution and mechanism of crack propagation method of interface in laminated Ti/Al2O3 composite
AU - Wu, Chao
AU - Li, Yunkai
AU - Wang, Zhi
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/4/25
Y1 - 2016/4/25
N2 - Metal-Ceramic composites possess remarkable mechanical properties and chemical stability, but suffer from brittleness. Here, we prepare laminated Ti/Al2O3 composite via tap-casting and hot-press sintering at 1500 °C with an applied pressure of 30 MPa for 1.5 h to improve its mechanical performance. Compact laminated structure and crack deflections emerged in a distinct interfacial region were observed. The EDS and XRD results demonstrate that aluminum (Al) and oxygen (O) elements transmit through the interface to titanium (Ti) layers and react with Ti to form AleTi intermetallic compounds, titanium oxides and solid solutions of Al-Ti-O. Meanwhile, triple junction boundary emerging in interface is evaluated by Zener's relation. Finally, the schematic illustration of microstructure evolution indicates that the hybrid fracture mode (e.g. trans-granular fracture, inter-granular fracture and the co-existing mode) results in the crack deflection. Owing to this hybrid fracture method, the laminated Ti/Al2O3 composite invariably performs better performance than monolithic composite.
AB - Metal-Ceramic composites possess remarkable mechanical properties and chemical stability, but suffer from brittleness. Here, we prepare laminated Ti/Al2O3 composite via tap-casting and hot-press sintering at 1500 °C with an applied pressure of 30 MPa for 1.5 h to improve its mechanical performance. Compact laminated structure and crack deflections emerged in a distinct interfacial region were observed. The EDS and XRD results demonstrate that aluminum (Al) and oxygen (O) elements transmit through the interface to titanium (Ti) layers and react with Ti to form AleTi intermetallic compounds, titanium oxides and solid solutions of Al-Ti-O. Meanwhile, triple junction boundary emerging in interface is evaluated by Zener's relation. Finally, the schematic illustration of microstructure evolution indicates that the hybrid fracture mode (e.g. trans-granular fracture, inter-granular fracture and the co-existing mode) results in the crack deflection. Owing to this hybrid fracture method, the laminated Ti/Al2O3 composite invariably performs better performance than monolithic composite.
KW - Interfacial reaction
KW - Laminated structure
KW - Ti/AlO composite
UR - https://www.scopus.com/pages/publications/84954317514
U2 - 10.1016/j.jallcom.2016.01.041
DO - 10.1016/j.jallcom.2016.01.041
M3 - Article
AN - SCOPUS:84954317514
SN - 0925-8388
VL - 665
SP - 37
EP - 41
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -