About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
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Presentation Title |
G-14: Optimization of Nanocrystalline, Ultra-fine Grained and Bimodal Nickel According to Mechanical Properties |
Author(s) |
Michael Marx, Dominic Rathmann, Christian Motz |
On-Site Speaker (Planned) |
Michael Marx |
Abstract Scope |
Optimizing the mechanical properties of nanocrystalline (nc), bimodal and ultrafine grained (ufg) nickel has been investigated with focus on tensile and fatigue strength and thermal and mechanical stability of the microstructure. The material was prepared by pulsed electro deposition with a layer thicknesses up to 2 mm and very homogeneous microstructure. Electron backscatter diffraction and transmission Kikuchi diffraction in scanning electron microscope were optimized as high resolution measurement techniques. Nc, bimodal and ufg microstructures could be adjusted by selecting suitable amount of additives and heat treatment parameters. The mechanical stability was investigated especially under cyclic loading with crack growth. The nc microstructures show the best mechanical properties. By atom probe tomography the reduction of strength and ductility of the bimodal and ufg microstructures could be attributed to grain boundary embrittlement caused by sulfur containing additives and heat treatment. Therefore, further approaches were discussed to increase the stability of nc metals. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nanotechnology, Characterization |