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Observing the crack tip behaviour at the nanoscale during fracture of ceramics
Materials Science · Submitted 19 Jul 2024
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Our analysis demonstrates how phase transformation toughening, previously thought to be effective at the microscale and above, promotes crack deflection at the nano-level and increases the fracture resistance by ~50%.
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The abstract, sentence by sentence
Ultimately, brittle fracture involves breaking atomic bonds. However, we still lack a clear picture of what happens in the highly deformed region around a moving crack tip. Consequently, we still cannot link nano to atomic-scale phenomena with the macroscopic toughness of materials. The unsolved challenge is to observe the movement of the crack front at the nanoscale while extracting quantitative information. Here we address this challenge by monitoring stable crack growth inside a TEM. Our analysis demonstrates how phase transformation toughening, previously thought to be effective at the microscale and above, promotes crack deflection at the nano-level and increases the fracture resistance by ~50%. The work will help to connect the atomistic and continuous view of fracture in a way that can guide the design of the next generation of strong and tough materials demanded by technologies as diverse as healthcare, energy generation or transport.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Ultimately, brittle fracture involves breaking atomic bonds. | background 1.00 | 0.05 | 0.02 | asserted 1.00 |
| s1 | However, we still lack a clear picture of what happens in the highly deformed region around a moving crack tip. | gap 0.99 | 0.11 | 0.02 | asserted 0.95 |
| s2 | Consequently, we still cannot link nano to atomic-scale phenomena with the macroscopic toughness of materials. | gap 0.97 | 0.08 | 0.02 | asserted 0.99 |
| s3 | The unsolved challenge is to observe the movement of the crack front at the nanoscale while extracting quantitative information. | gap 0.99 | 0.05 | 0.03 | asserted 0.99 |
| s4 | Here we address this challenge by monitoring stable crack growth inside a TEM. | method 0.53 | 0.95 | 0.04 | asserted 0.96 |
| s5 | Our analysis demonstrates how phase transformation toughening, previously thought to be effective at the microscale and above, promotes crack deflection at the nano-level and increases the fracture resistance by ~50%. | result 0.99 | 0.93 | 0.89 | asserted 1.00 |
| s6 | The work will help to connect the atomistic and continuous view of fracture in a way that can guide the design of the next generation of strong and tough materials demanded by technologies as diverse as healthcare, energy generation or transport. | interpretation 0.77 | 0.25 | 0.13 | hedged possibility 0.62 |
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The paper
Original abstract
Ultimately, brittle fracture involves breaking atomic bonds. However, we still lack a clear picture of what happens in the highly deformed region around a moving crack tip. Consequently, we still cannot link nano to atomic-scale phenomena with the macroscopic toughness of materials. The unsolved challenge is to observe the movement of the crack front at the nanoscale while extracting quantitative information. Here we address this challenge by monitoring stable crack growth inside a TEM. Our analysis demonstrates how phase transformation toughening, previously thought to be effective at the microscale and above, promotes crack deflection at the nano-level and increases the fracture resistance by ~50%. The work will help to connect the atomistic and continuous view of fracture in a way that can guide the design of the next generation of strong and tough materials demanded by technologies as diverse as healthcare, energy generation or transport.
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