{"title":"氮化硅陶瓷的微尺度上升r曲线行为","authors":"Takahiro Saito, Tatsuki Ohji, Takuma Takahashi, Motoyuki Iijima, Junichi Tatami","doi":"10.1111/jace.20477","DOIUrl":null,"url":null,"abstract":"<p>This study investigated <i>R-</i>curve behavior when a crack extended several 100 nm for Y<sub>2</sub>O<sub>3</sub>–Al<sub>2</sub>O<sub>3</sub> doped Si<sub>3</sub>N<sub>4</sub> ceramics, using single-edge notched microcantilever beam specimens. The serrate or sawtooth behavior was observed around the maximum load of the load-displacement diagram, indicating the repetition of crack initiation and arrest. The toughness plots with crack extension from the diagram resulted in a rising <i>R</i>-curve fitting into one smooth line, which showed a 1.4 MPa m<sup>1/2</sup> toughness increase during crack extension equivalent to one-grain diameter. The maximum bridging stress calculated from the <i>R</i>-curve, approximately 1.8 GPa, was also close to the previous results, while the stress was estimated to rise more steeply than previously thought.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 7","pages":""},"PeriodicalIF":3.5000,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20477","citationCount":"0","resultStr":"{\"title\":\"Microscale rising R-curve behavior of silicon nitride ceramics\",\"authors\":\"Takahiro Saito, Tatsuki Ohji, Takuma Takahashi, Motoyuki Iijima, Junichi Tatami\",\"doi\":\"10.1111/jace.20477\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>This study investigated <i>R-</i>curve behavior when a crack extended several 100 nm for Y<sub>2</sub>O<sub>3</sub>–Al<sub>2</sub>O<sub>3</sub> doped Si<sub>3</sub>N<sub>4</sub> ceramics, using single-edge notched microcantilever beam specimens. The serrate or sawtooth behavior was observed around the maximum load of the load-displacement diagram, indicating the repetition of crack initiation and arrest. The toughness plots with crack extension from the diagram resulted in a rising <i>R</i>-curve fitting into one smooth line, which showed a 1.4 MPa m<sup>1/2</sup> toughness increase during crack extension equivalent to one-grain diameter. The maximum bridging stress calculated from the <i>R</i>-curve, approximately 1.8 GPa, was also close to the previous results, while the stress was estimated to rise more steeply than previously thought.</p>\",\"PeriodicalId\":200,\"journal\":{\"name\":\"Journal of the American Ceramic Society\",\"volume\":\"108 7\",\"pages\":\"\"},\"PeriodicalIF\":3.5000,\"publicationDate\":\"2025-03-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.20477\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of the American Ceramic Society\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1111/jace.20477\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, CERAMICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the American Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/jace.20477","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
Microscale rising R-curve behavior of silicon nitride ceramics
This study investigated R-curve behavior when a crack extended several 100 nm for Y2O3–Al2O3 doped Si3N4 ceramics, using single-edge notched microcantilever beam specimens. The serrate or sawtooth behavior was observed around the maximum load of the load-displacement diagram, indicating the repetition of crack initiation and arrest. The toughness plots with crack extension from the diagram resulted in a rising R-curve fitting into one smooth line, which showed a 1.4 MPa m1/2 toughness increase during crack extension equivalent to one-grain diameter. The maximum bridging stress calculated from the R-curve, approximately 1.8 GPa, was also close to the previous results, while the stress was estimated to rise more steeply than previously thought.
期刊介绍：
The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials.
Papers on fundamental ceramic and glass science are welcome including those in the following areas:
Enabling materials for grand challenges[...]
Materials design, selection, synthesis and processing methods[...]
Characterization of compositions, structures, defects, and properties along with new methods [...]
Mechanisms, Theory, Modeling, and Simulation[...]
JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.
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