About this Abstract |
Meeting |
12th International Conference on Magnesium Alloys and their Applications (Mg2021)
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Symposium
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12th International Conference on Magnesium Alloys and their Applications (Mg 2021)
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Presentation Title |
Effect of LPSO Phases on Crack Propagation in an Extruded Mg-Dy-Nd-Zn-Zr Alloy Influenced by Heat Treatment |
Author(s) |
Petra Maier, Benjamin Clausius, Norbert Hort |
On-Site Speaker (Planned) |
Petra Maier |
Abstract Scope |
The effect of LPSO-phases on the crack propagation in different microstructures modified by heat treatment is investigated. Solution heat treatment on a hot extruded RESOLOY (Mg-Dy-Nd-Zn-Zr) has been done to change the initial fine-grained microstructure, consisting of lamellar LPSO structures within the matrix, into coarser grains of less lamellae but more bulk LPSO-phases. Crack initiation and propagation are of interest. Since the coarser microstructure tends to twin under plastic deformation, the crack propagation is also influenced by twin boundaries. The bulk LPSO-phases clearly hinder crack growth, either by increasing the energy to pass through the phase or along its interface. Twin boundaries and LPSO-phases are also responsible for crack initiation. The microstructural features were characterized by micro- and nanohardness as well as the amount and location of LPSO-phases in dependence on the heat treatment condition. Bulk LPSO-phases show a higher hardness than the grains with or without lamellar LPSO-phases. |
Proceedings Inclusion? |
Planned: At-meeting proceedings |