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Discontinuous Dissolution Reaction in a Fe-13.5 at. % Zn Alloy
Paweł Zięba1, Mateusz Chronowski1, Jarosław Opara2
1Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Cracow, Poland.
This study investigates the dissolution of lamellar structures in a Fe-Zn alloy. The dissolution occurs discontinuously, leaving behind "ghost images" and "ghost lines" in the new solid solution.
Area of Science:
- Materials Science
- Metallurgy
- Physical Chemistry
Background:
- Discontinuous precipitation reactions form lamellar structures composed of alpha (solute-depleted solid solution) and Gamma (Fe3Zn10 intermetallic) phases.
- Understanding the dissolution behavior of these structures is crucial for controlling alloy properties.
Purpose of the Study:
- To investigate the dissolution process of lamellar alpha and Gamma phases in a Fe-13.5 at.% Zn alloy.
- To characterize the microstructural evolution and chemical composition during dissolution.
- To simulate and determine the zinc concentration profiles in the post-dissolution region.
Main Methods:
- Optical microscopy
- Scanning electron microscopy (SEM)
- Transmission electron microscopy (TEM)
- Quantitative microchemical analysis
- Simulation of concentration profiles
Main Results:
- Dissolution occurs discontinuously, characterized by a receding reaction front.
- The post-dissolution solid solution exhibits inhomogeneity, showing 'ghost images' of former Gamma lamellae and 'ghost lines' of the receding front.
- Simulated Zn concentration profiles correlate with microchemical analysis, indicating the influence of Gamma lamellae dissolution.
Conclusions:
- The dissolution of discontinuous precipitation products in Fe-Zn alloys proceeds discontinuously.
- Microstructural 'ghost features' provide evidence of the dissolution pathway.
- Zinc concentration profiles are significantly influenced by the local composition at the sites of Gamma lamellae dissolution.
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