About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
|
Presentation Title |
The Role of Amorphous Shear Bands in Deformation of Crystalline Materials |
Author(s) |
Izabela A. Szlufarska |
On-Site Speaker (Planned) |
Izabela A. Szlufarska |
Abstract Scope |
Amorphous shear bands (a-SBs) are known to form in crystalline materials subjected to high strain rates or in the presence of severe plastic deformation. Formation of a-SBs is typically followed by cavitation and fracture and therefore a-SB have been considered detrimental to mechanical performance. We have recently found that a-SBs can form in crystalline materials without pre-existing damage and at low strain rates. We also found that a-SBs do not have to lead to cavitation and fracture, but instead can be drivers of plasticity in the absence of dislocations. Using a combination of molecular simulations and small-scale mechanical testing we identified properties of materials that support formation of a-SBs and we proposed criteria for when a-SBs will increase fracture toughness instead of leading to cavitation. Our findings provide insights into improvements of fracture toughness of nominally brittle materials. |
Proceedings Inclusion? |
Planned: |