Abstract
Magnesium alloy WE54 has been used commercially for fabricating components for aerospace and aircraft applications. Its useful mechanical properties are achieved via a precipitation process, β1 and β′ are the two strengthening precipitate phases when this alloy is peak-aged at 250°C. The β1 precipitate plates often form with β′ particles attached to their end facets. The aim of this study is to understand the correlated nucleation of the β1 and β′ phases. The equilibrium shapes of coherent β1 and β′ precipitates are simulated using the phase field method. The preferential nucleation site of a nucleating precipitate at the interface of pre-existing particle/Mg matrix is analyzed through the calculation of the elastic interaction energy between the nucleating precipitate and the pre-existing particle. The evolution sequence of the β1 and β′ phases are also simulated in this work. Our results indicate that the coherency elastic strain energy can be reduced significantly if a β′ particle forms at an edge facet of a pre-existing β1 plate, and that the preferred nucleation sites of the β′ particles are at the two end-facets of the β1 plate. Under the assumption that the β1 phase nucleates first, the microstructure evolution sequence is proposed in this work.
Original language | English |
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Title of host publication | Proceedings of the 1st World Congress on Integrated Computational Materials Engineering, ICME |
Subtitle of host publication | Seven Springs, PA, USA; 10-14 July 2011 |
Editors | John Allison, Peter Collins, George Spanos |
Place of Publication | Hoboken NJ USA |
Publisher | John Wiley & Sons |
Pages | 3-8 |
Number of pages | 6 |
ISBN (Electronic) | 9781118147726 |
ISBN (Print) | 9780470943199 |
Publication status | Published - 2011 |
Event | World Congress on Integrated Computational Materials Engineering (ICME) 2011 - Seven Springs, United States of America Duration: 10 Jul 2011 → 14 Jul 2011 Conference number: 1st |
Conference
Conference | World Congress on Integrated Computational Materials Engineering (ICME) 2011 |
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Abbreviated title | ICME 2011 |
Country/Territory | United States of America |
City | Seven Springs |
Period | 10/07/11 → 14/07/11 |
Keywords
- Interaction energy
- Magnesium alloys
- Microstructure evolution
- Phase field approach
- Precipitation hardening