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Research Article
Zhaodong Wang
Northeastern University
Corresponding Author
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Formation mechanism of β’’-Mg5Si6 and its PFZ in an Al-Mg-Si-Mn alloy was studied by the means of experiment and first-principles calculations. Results show that at 270°C during the 100 °C/h heating period, β’’-Mg5Si6 precipitated inside the dendrites, whereas precipitation free zones (PFZs) of β’’-Mg5Si6 presented near the dendrite arm regions. The formation of the β’’-Mg5Si6 and its PFZ were related to the concentration of vacancy. Low-concertation zones of vacancy formed near the eutectics during the solidification due to the constitutional supercooling, no β’’-Mg5Si6 precipitated in the low-concertation zones of vacancy due to the vacancy-dependence of β’’-Mg5Si6, the Si vacancy-containing β’’-Mg5Si6 was extremely unstable and Si vacancies prefer to stay away from distribution.
Keywords
precipitation free zone (PFZ), β’’-Mg5Si6, vacancy, first-principles calculations
This preprint is available for download as a PDF.
No competing interests reported.
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This preprint is under consideration at Scientific Reports. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Zhaodong Wang
Northeastern University
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 09 Nov, 2021
No community comments so far
Editor invited
On 08 Nov, 2021
Submission checks complete
On 08 Nov, 2021
First submitted
On 31 Oct, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Formation mechanism of β’’-Mg5Si6 and its PFZ in an Al-Mg-Si-Mn alloy was studied by the means of experiment and first-principles calculations. Results show that at 270°C during the 100 °C/h heating period, β’’-Mg5Si6 precipitated inside the dendrites, whereas precipitation free zones (PFZs) of β’’-Mg5Si6 presented near the dendrite arm regions. The formation of the β’’-Mg5Si6 and its PFZ were related to the concentration of vacancy. Low-concertation zones of vacancy formed near the eutectics during the solidification due to the constitutional supercooling, no β’’-Mg5Si6 precipitated in the low-concertation zones of vacancy due to the vacancy-dependence of β’’-Mg5Si6, the Si vacancy-containing β’’-Mg5Si6 was extremely unstable and Si vacancies prefer to stay away from distribution.
This preprint is available for download as a PDF.
No competing interests reported.
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