A detailed analysis of the determination of fracture toughness by nanoindentation induced radial cracks

Guo, Yi; Staedler, Thorsten; Müller, Julian; Heuser, Steffen; Butz, Benjamin; Jiang, Xin

doi:10.1016/j.jeurceramsoc.2019.10.013

Cited by 13 publications

(7 citation statements)

References 28 publications

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“…Additionally, the determined moduli of these composites using the proposed method were in good agreement with surface acoustic wave results . Meanwhile, its fracture toughness was enhanced to 11.1 ± 1.1 MPa m 1/2 . Such a value is of extreme significance since the fracture toughness is known to be the critical for the investigation of crack morphology and the appropriate selection of reference materials to ensure reproducible evaluation of fracture toughness for any unknown material.…”

Section: Dia/sic Compositessupporting

confidence: 63%

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Diamond Composite: A “1 + 1 > 2” Strategy to Design and Explore Advanced Functional Materials

Chen,

Dong,

Jiang

et al. 2024

Acc. Mater. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS: Diamond composite (DC) refers to a system which consists of diamond (Dia) and other components. Various interactions between diamond and other components exist. The first DC, Dia/β-silicon carbide (β-SiC) composite, was grown in 1992 by means of chemical vapor deposition (CVD) technique. Later on, precise control of the distribution, crystallinity, and orientation of both diamond and β-SiC phases in these composites was sequentially achieved, generating numerous Dia/β-SiC composites and further leading to their wide applications in diverse fields. Inspired by the activities of Dia/ β-SiC composites, other DCs, produced using different CVD techniques, have been reported, including Dia/carbides, Dia/oxides, Dia/nitrides, Dia/sp 2 -carbon, Dia/metal, Dia/metal alloy, and Dia/organic composites. Meanwhile, these composites possess different micro-and nanostructures. Since DCs fully combine the outstanding properties of diamond with those of other components, their utilization in the mechanical, physical, chemical, and biomedical fields have been extensively explored and tested. This "1 + 1 > 2" strategy is believed to be extremely efficient and useful to design and explore advanced diamond functional materials. The origin of superior enhancement and/or new properties of these DCs using the "1 + 1 > 2" strategy stems from the interface and interactions between individual components as well as their synergistic effects. This Account summarizes the progress and achievements of DCs in our group. Their typical synthesis methods, namely, dry and wet ones, are first overviewed. The dry methods are conducted in the gas phase(s), covering high-pressure high-temperature (HPHT) method, CVD method, and physical vapor deposition (PVD). While the wet methods mainly include electrochemical deposition and hydrothermal processes. The mechanical, and physical features of different Dia/β-SiC DCs are then detailed. Some application examples of these Dia/β-SiC DCs are highlighted. In the second part of this Account, synthesis and applications of other DCs, especially those with photo/electrochemical features, are illustrated, for example, the electrocatalysis of Dia/graphite composites toward oxygen reduction/evolution reactions (ORR/OER) and further the construction of flexible zinc-air batteries, the use of Dia/ oxides (carbide) composites for the construction of battery-like supercapacitors, the employment of Dia/TiO 2 composites for photoelectrochemical degradation of environmental pollutants, and the application of Dia/metal composites for electrochemical sensing. This Account finishes with the future prospects of DCs, encompassing their meticulous conceptualization and synthesis, as well as their multifarious applications across diverse domains.

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Section: Dia/sic Compositessupporting

confidence: 63%

“…Further addition of TMB led to a conductivity of as high as 100 S cm −1 . 41 In this case, two regions corresponding to β-SiC crystals appear: highly conductive and nonconductive areas. (Figure 3c).…”

Section: Synthesismentioning

confidence: 99%

Diamond Composite: A “1 + 1 > 2” Strategy to Design and Explore Advanced Functional Materials

Chen,

Dong,

Jiang

et al. 2024

Acc. Mater. Res.

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“…The deviation from this result is because the actual Berkovich indenter deviates from the ideal assumption of complete rigidity and perfection. Thus, the area considered in the nanoindentation calculations is smaller than the actual contact area between the indenter and specimen 45–47 . This can lead to the overestimation of the hardness and Young's modulus, especially in indentations with a small tip radius.…”

Section: Resultsmentioning

confidence: 99%

Y_1/6Yb_5/6TaO₄/8YSZ composite ceramics with enhanced mechanical and thermal properties

Wang,

Chen,

Zhang

et al. 2024

J Am Ceram Soc.

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Ceramic thermal barrier coatings (TBCs) with high toughness and low thermal conductivity are important for developing aero engines with high thrust‐to‐weight ratio and thermal efficiency. In this work, the properties of tantalate Y1/6Yb5/6TaO4 (YYT) were optimized by introducing 8 wt.% yttria‐stabilized zirconia (8YSZ), synthesized using spark plasma sintering, as a second‐phase ceramic. The highest toughness (3.57 MPa m1/2) of the YYT/8YSZ composite ceramics was due to multiple toughening mechanisms. The underlying mechanisms of these processes were revealed based on the microstructures and residual stress of the YYT/8YSZ composite ceramics. A shift from an intergranular fracture to a transgranular fracture was caused by the difference between soft‐grain YYT and hard‐grain 8YSZ, which consumed the fracture energy. Furthermore, the formation of microcracks, crack deflection, bridging, and branching were analyzed based on the differences in Young's moduli and thermal expansion coefficients of YYT and 8YSZ. Internal defects and weak connections between the YYT and 8YSZ grains reduced the thermal conductivity of the composites until it reached its lowest value at 1.4 W m−1 K−1. The studied toughening mechanisms could be applied to various composites. Moreover, herein, we provide a new strategy to design and synthesize TBCs with enhanced performance.

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“…The indentation crack length (ICL) method allows evaluating the K c by measuring the crack lengths emanated from corners of the imprint and is very useful for a variety of materials in small scales and thin films/coatings [19,20]. Guo et al [21] examined the existing ICL models of various materials such as silicon, soda-lime glass, silicon carbide, sapphire and fused quartz by using nanoindentation, and they revealed that these materials exhibit different crack development mechanisms at the same indentation depths. Bor et al [22] studied the fracture toughness of supercrystalline materials by comparing indenter types and ICL models from literature and stated that Berkovich indenter presents the most accurate results, and distinct K c values were obtained for different models that indicated that the determination of crack mechanism is crucial to obtain correct results.…”

Section: Introductionmentioning

confidence: 99%

Nanomechanical characterisation of single‐crystal Bi ₂ Se ₃ topological insulator

Uzun

Yetmez

Akıncı

2021

Micro & Nano Letters

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Topological insulators (TIs) are recently discovered high‐tech materials where their potential use in nanoelectronic devices such as spintronics and quantum computers, due to their unique electronic features, can be a solution to the emerging need for high‐bit data processing. Yet their mechanical properties are not well understood for their use in practical applications. With the objective of exploiting the nanomechanical behaviour of TIs, bulk single‐crystal Bi2Se3 TI is grown by using the Bridgeman–Stockbarger method and mechanically characterised by the nanoindentation method. The Young's modulus and hardness were extracted from the load‐displacement data by using Oliver and Pharr's standard method. Further, fracture toughness of the material was reported for the first time after comprehensive research of indentation crack length (ICL) methods. The grown Bi2Se3 exhibits hardness and Young's modulus as 323 MPa and 6.018 GPa at nanoscale, respectively. Fracture toughness of the TI was evaluated at 0.034 MPa m1/2 and elastic recovery was around 60% after the full unloading process.

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A detailed analysis of the determination of fracture toughness by nanoindentation induced radial cracks

Cited by 13 publications

References 28 publications

Diamond Composite: A “1 + 1 > 2” Strategy to Design and Explore Advanced Functional Materials

Diamond Composite: A “1 + 1 > 2” Strategy to Design and Explore Advanced Functional Materials

Y_1/6Yb_5/6TaO₄/8YSZ composite ceramics with enhanced mechanical and thermal properties

Nanomechanical characterisation of single‐crystal Bi ₂ Se ₃ topological insulator

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A detailed analysis of the determination of fracture toughness by nanoindentation induced radial cracks

Cited by 13 publications

References 28 publications

Diamond Composite: A “1 + 1 > 2” Strategy to Design and Explore Advanced Functional Materials

Diamond Composite: A “1 + 1 > 2” Strategy to Design and Explore Advanced Functional Materials

Y1/6Yb5/6TaO4/8YSZ composite ceramics with enhanced mechanical and thermal properties

Nanomechanical characterisation of single‐crystal Bi 2 Se 3 topological insulator

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Product

Resources

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Y_1/6Yb_5/6TaO₄/8YSZ composite ceramics with enhanced mechanical and thermal properties

Nanomechanical characterisation of single‐crystal Bi ₂ Se ₃ topological insulator