Mechanical Properties and Damage Tolerance of Bulk Yb3Al5O12 Ceramic

doi:10.1016/j.jmst.2015.01.002

Abstract

Abstract: Yb₃Al₅O₁₂ has potential applications as thermal barrier coatings (TBCs) because it shows low thermal conductivity and close thermal expansion coefficient to nickel-based superalloys. As a prospective TBC material, besides superior thermal properties, the mechanical properties are also important. In this paper, we present the mechanical properties of Yb₃Al₅O₁₂ including elastic moduli, hardness, strength, and fracture toughness. The Young's modulus of Yb₃Al₅O₁₂ is 282 GPa. The shear-modulus-to-bulk-modulus ratio of Yb₃Al₅O₁₂ is 0.63, which indicates relatively low shear deformation resistance. In addition, Yb₃Al₅O₁₂ exhibits high strength and fracture toughness but low hardness compared to yttria stabilized zirconia (YSZ), the most successful TBC material. SEM observation reveals that the fracture surface of Yb₃Al₅O₁₂ displays “layered structure feature”, which is caused by crack deflection. Investigation based on Hertzian contact test demonstrates that Yb₃Al₅O₁₂ is a damage-tolerant ceramic. Crack deflection and bridging can arouse shear faults, dissipate the local damage energy, and restrict the crack propagation within the material, which play an important role in enhancing the damage tolerance. The superior mechanical properties and good damage tolerance ensure Yb₃Al₅O₁₂ a promising candidate for TBC applications.

Key words: Yb3Al5O12, Mechanical properties, Damage, Strength

Xiaofei Wang, Huimin Xiang, Xin Sun, Jiachen Liu, Feng Hou, Yanchun Zhou. Mechanical Properties and Damage Tolerance of Bulk Yb₃Al₅O₁₂ Ceramic[J]. J. Mater. Sci. Technol., 2015, 31(4): 369-374.

Figures/Tables 6

Comparison between experimental and simulated X-ray diffraction patterns using the Reflex code in Materials Studio software suit X-ray diffraction patterns of Yb3Al5O12.

Microstructure of hot-pressed Yb3Al5O12 after thermal etching at 1400°

C for 1h.

(a) Vickers hardness of Yb3Al5O12 versus load

the inset figure is the 10 N indentation surface, and (b) high magnification of crack deflection and bridging.

Fracture surface of Yb3Al5O12 after compression.

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Mechanical Properties and Damage Tolerance of Bulk Yb₃Al₅O₁₂ Ceramic

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