Evolution and mechanism of crack propagation method of interface in laminated Ti/Al2O3 composite

Wu, Chao; Li, Yunkai; Wang, Zhi

doi:10.1016/j.jallcom.2016.01.041

Cited by 21 publications

(8 citation statements)

References 19 publications

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“…The interface between the Al 2 O 3 and Ti phases is weaker than the interface of monolithic Al 2 O 3. When Al 2 O 3 /Ti composites are sintered at high temperature, strong interfacial reactions between Al 2 O 3 and Ti lead to the formation of Ti‐Al intermetallic compounds such as TiAl and Ti 3 Al . These phases exhibit brittleness, low toughness, and poor creep resistance and thus result in weakened bonding force along with degraded mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Fine Ti‐dispersed Al₂O₃ composites and their mechanical and electrical properties

et al. 2018

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Al2O3/Ti composites containing 0‐30 vol% dispersed fine Ti particles were fabricated using a hot‐press sintering method at 1500°C from mixtures of Al2O3 and TiH2 powders. During sintering, TiH2 decomposed to form metallic Ti. The effects of the Ti content on the mechanical and electrical properties of the composites were then investigated. No Ti‐Al intermetallic compounds were detected by X‐ray diffraction, and energy‐dispersive X‐ray spectroscopy indicated the presence of Al‐Ti‐O solid solution and Ti‐O phases. The composites showed enhanced densification; the measured densities were higher than the calculated theoretical values. Microstructural observation revealed homogeneously distributed fine Ti particles dispersed in the Al2O3 matrix. The Ti particle size ranged from submicrometer to a few micrometers depending on the Ti content. The fracture mode of the composites was primarily transgranular, in contrast to the intergranular fracture mode of monolithic Al2O3. Although the flexural strength was decreased with increase in Ti content, the composite containing 20 vol% Ti displayed the maximum fracture toughness of 4.3 MPa·cm1/2, which was 37% greater than that of monolithic Al2O3. The composites containing more than 15 vol% Ti exhibited drastic decreases in resistivity (~10−1 Ωcm), which were attributed to the formation of interconnected Ti networks at these Ti contents. The percolation threshold volume for electrical conduction in the present system was calculated to be 13.8 vol%. The results indicate that dispersing fine Ti particles into Al2O3 increased the fracture toughness and improved the conductivity of Al2O3.

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Section: Introductionmentioning

confidence: 99%

Fine Ti‐dispersed Al₂O₃ composites and their mechanical and electrical properties

et al. 2018

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“…In the Al 2 O 3 /Ti study, it was found that Al 2 O 3 at the interface decomposes at high temperatures to generate a brittle Ti–Al phase. The decomposition produces O with a strong affinity for Ti, resulting in a strong interfacial bond 19–22 . In addition, residual stresses affect the properties of the laminated composites.…”

Section: Introductionmentioning

confidence: 99%

Influence of metallic properties on the fracture characteristics of Al₂O₃/Ti/Ni‐laminated composites

Liu

Xie

Xia

et al. 2022

Int J Applied Ceramic Tech

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The mutual confinement of ceramics and metals in laminated composites tends to change the original properties of ceramics and metals. In this study, two kinds of laminated composites, Al 2 O 3 /Ti and Al 2 O 3 /Ti/Ni, were prepared. Three-point bending experiments revealed that Al 2 O 3 /Ti underwent brittle fracture after elastic deformation. The fracture morphology analysis revealed that the Ti in Al 2 O 3 /Ti became brittle due to the formation of columnar crystals. The temperature gradient perpendicular to the direction of laminations during preparation was responsible for the formation of columnar crystals. The force-displacement curves of the Al 2 O 3 /Ti/Ni combine the properties of elastic deformation of ceramics and plastic deformation of metals. The reason why the Al 2 O 3 /Ti/Ni did not fracture completely in the bending experiments is that Ni maintained the toughness, and there is a good interfacial bond among Al 2 O 3 , Ti, and Ni. The indentation crack analysis revealed that cracks have long transverse propagation and short longitudinal propagation in both laminated composites. Finite element analysis revealed that this was due to compressive stress in the Al 2 O 3 layer and tensile stress in the metal layer. This compressive stress consumes the crack energy in the longitudinal direction and stops the crack in the metal layer. The brittle to ductile gradient transition among Al 2 O 3 , Ti, and Ni, combined with the guidance of crack propagation direction by the interfacial layer, enhances the ability of Al 2 O 3 /Ti/Ni to resist damage.

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“…Thus, for decades much attention has been focused on the development of Al 2 O 3 -metal composites. The performance of Al 2 O 3 -metal composites can be improved by introducing various metal particles such as Ni [13], Cu [6], Mo [14], Ti [15], etc. The Ti-Al 2 O 3 composite was prepared by using pressureless sintering, and the flexural strength was 160 MPa [16].…”

Section: Introductionmentioning

confidence: 99%

Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites

Chen

Shi

et al. 2019

Materials

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Fe-Al2O3 composites were prepared by pressureless sintering, using Bayan Obo iron concentrate and bauxite as the main raw materials, activated carbon was added as the reducing agent. The effects of different bauxite additions on the phase composition, microstructures, mechanical properties, and the corrosion-resistance were investigated. The results show that the average grain size of alumina decreased as the bauxite content increased. In addition, bauxite contains TiO2, CaO, and MgO, that can form a liquid phase at high temperature, causing the heat capacity of the micro-zone around the metal phase to be different, which leads to a change of undercooling and further affects the dislocation density of the metal phase. The plastic deformation ability of the metal phase can be improved with the low dislocation density. Fracture mechanism analysis indicated that the metal phase absorbed energy through plastic deformation. The optimum performance of the sample was as follows: the flexural strength was 310 MPa, the hardness 12.14 GPa, the alkali resistance 98.32%, and the acid resistance 95.44%.

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Evolution and mechanism of crack propagation method of interface in laminated Ti/Al2O3 composite

Cited by 21 publications

References 19 publications

Fine Ti‐dispersed Al₂O₃ composites and their mechanical and electrical properties

Fine Ti‐dispersed Al₂O₃ composites and their mechanical and electrical properties

Influence of metallic properties on the fracture characteristics of Al₂O₃/Ti/Ni‐laminated composites

Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites

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Evolution and mechanism of crack propagation method of interface in laminated Ti/Al2O3 composite

Cited by 21 publications

References 19 publications

Fine Ti‐dispersed Al2O3 composites and their mechanical and electrical properties

Fine Ti‐dispersed Al2O3 composites and their mechanical and electrical properties

Influence of metallic properties on the fracture characteristics of Al2O3/Ti/Ni‐laminated composites

Natural Advantages of Preparation of Composites from Minerals: Effect of Bauxite Addition on the Microstructures and Properties of Fe-Al2O3 Based Composites

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Product

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Fine Ti‐dispersed Al₂O₃ composites and their mechanical and electrical properties

Fine Ti‐dispersed Al₂O₃ composites and their mechanical and electrical properties

Influence of metallic properties on the fracture characteristics of Al₂O₃/Ti/Ni‐laminated composites