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Author |
Ding, L.; Ehlers, F.J.H.; Hu, R.; Zhang, Z.; Nagaum, H.; Hutchinson, C.; Liu, Q.; Jia, Z. |
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Title |
On the order-disorder transformation within a main hardening precipitate in Al-Mg-Si alloys |
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A1 Journal article |
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Year  |
2025 |
Publication |
Philosophical magazine |
Abbreviated Journal |
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Volume |
105 |
Issue |
3 |
Pages |
169-188 |
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Keywords |
A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT) |
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Abstract |
The earliest stages of solid-state precipitation in age hardenable alloys, before the first ordered phase formation, are notoriously elusive, yet often of central importance to material properties quantification. The order-disorder precipitate transformations are currently accepted to proceed by long-range chemical ordering on a substructure extending through the particle, with the Al-Mg-Si alloy Guinier-Preston (GP) zone -> beta '' transformation representing the most well-documented example. It is shown here that the structurally distinct beta '' phase arises directly from solute diffusion-controlled precipitation within a precipitate, providing an alternative pathway for the transformation of one precipitate to a more thermodynamically stable precipitate. The emergence of dispersed beta '' nuclei in the otherwise fcc-based particle is revealed by structural and chemical signs of a significant spatial solute variation. Furthermore, upon reduced aging temperature, heavily structurally flawed final particles result from increasingly challenging nucleus coalescence. The highly localised origin of this process suggests that early-stage precipitate transformation mechanisms be revisited for other age hardenable alloys. |
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Wos |
WOS:001343878200001 |
Publication Date |
2024-10-28 |
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ISSN |
1478-6435 |
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Additional Links |
UA library record; WoS full record |
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Open Access |
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Approved |
no |
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Call Number |
UA @ admin @ c:irua:210502 |
Serial |
9452 |
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| Permanent link to this record |
