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Point defect intera...
Point defect interactions with Guinier-Preston zones in Al-Cu based alloys : Vacancy mediated GPZ to θ′-phase transformation
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Petrik, M. V. (author)
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Gornostyrev, Y. N. (author)
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- Korzhavyi, Pavel A., 1966- (author)
- KTH,Materialvetenskap
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(creator_code:org_t)
- Acta Materialia Inc, 2019
- 2019
- English.
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In: Scripta Materialia. - : Acta Materialia Inc. - 1359-6462 .- 1872-8456. ; 165, s. 123-127
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The energetics of point defect interactions with a Guinier-Preston zone (GPZ) in Al alloys are systematically studied using ab initio calculations and a supercell approach. We find that vacancies can be trapped by GPZs and that the presence of a vacancy in a Cu layer qualitatively changes the solute–GPZ interactions. A vacancy mediated mechanism of GPZ to θ′-phase transformation is suggested and shown to be thermodynamically feasible, which involves the formation of structural vacancies and splitting of a GPZ layer into two half-vacant Cu layers. This mechanism, in combination with the calculated attractive solute-vacancy interactions, is predicted to result in the solute segregation at the interface between Al matrix and the forming θ′-phase precipitate.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Keyword
- Ab initio calculations
- Aluminum alloys
- Phase transformation
- Point defects
Publication and Content Type
- ref (subject category)
- art (subject category)
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