About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Characterization of Nuclear Materials and Fuels with Advanced X-ray and Neutron Techniques
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Presentation Title |
Microstructural Characterization of the Stress and Strain Deformation Partitioning Evolution in Tungsten Heavy Alloys |
Author(s) |
David Sprouster, M. E. Alam, G. R. Odette, L Snead |
On-Site Speaker (Planned) |
David Sprouster |
Abstract Scope |
Tungsten is generally too brittle to serve a structural function. However, the fracture toughness of 90 to 97 wt.%W Fe-Ni liquid phase sintered tungsten heavy alloys (WHAs) is typically 10 to 20 times larger than monolithic W. These WHAs are composed of 30 µm W-particles embedded in a continuous surrounding thin walled honeycomb ductile fcc Fe-Ni-W phase matrix. The superior WHA toughness involves new mechanisms associated with arrest, blunting and bridging of numerous dilatational shielding process zone W-particle scale microcracks, that sustain large amounts of plastic deformation, even in the W-constituent. Here, both laboratory and synchrotron-based x-ray techniques are used to characterize the in-situ evolution of local constituent stress and strain, their multiaxial stress states, as well as dislocation structures and damage, in tensile specimens loaded to near rupture. This unique database will be key to developing rigorous models of the remarkable new toughing mechanisms operating in WHA. |
Proceedings Inclusion? |
Planned: |