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Weibull statistical analysis of fracture behavior and Vicker’s hardness of yttria ceramics sintered at various temperatures

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Abstract

This study systematically investigated the microstructural evolution of hot-pressed sintered Yttria ceramics by varying the sintering temperature. Mechanical properties, including Vickers hardness, were rigorously assessed to gain insights into the material’s response to different processing conditions. Furthermore, fracture toughness was derived from Vickers hardness measurements, and a comprehensive Weibull statistical analysis was conducted to understand the material’s failure behavior. Our findings reveal distinct trends in mechanical properties as a function of sintering temperature. Specifically, the Shape and Scale parameters of the Weibull distribution exhibited significant variations in the temperature range where mixed crystalline and glassy phases coexisted. Notably, fracture toughness exhibited a pronounced decline at temperatures favoring the formation of glassy materials. Microstructural observations unveiled intriguing phenomena, including crack splitting and hackle formation, predominantly in the uncrystallized remnants of liquid phase specimens with increased density. The emergence of these fracture patterns underscores the role of microstructural changes within the grain boundaries. When crystalline phase transitions occurred, statistically processed fracture toughness data revealed a mean value of 1.39 ± 0.071 MPa, providing a robust confidence interval for Yttria ceramics. This research elucidates the complex interplay between microstructural variations and mechanical properties, shedding light on the critical factors influencing the performance and reliability of Yttria ceramics under varying sintering conditions.

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Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2021R1F1A1062334) and the Technology development Program (00220863) funded by the Ministry of SMEs and Startups (MSS, Korea) and Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (P0008458, HRD Program for Industrial Innovation).

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Authors and Affiliations

  1. Dept. of Materials Science and Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon, 22212, Korea

    Seung-Wook Kim, Hwa-Pyeong Lee, Ji-Ung Ha, Jin-Sam Choi & Dae-Yong Jeong

  2. Department of Physics, University of the Punjab, Lahore, 54590, Pakistan

    Fauzia Iqbal

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  1. Seung-Wook Kim
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Correspondence to Dae-Yong Jeong.

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Kim, SW., Lee, HP., Ha, JU. et al. Weibull statistical analysis of fracture behavior and Vicker’s hardness of yttria ceramics sintered at various temperatures. J. Korean Ceram. Soc. 61, 402–410 (2024). https://doi.org/10.1007/s43207-024-00375-z

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