Transition to abnormal grain growth from the pinned state and from normal growth.
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| Title: | Transition to abnormal grain growth from the pinned state and from normal growth. |
|---|---|
| Authors: | Patterson, Burton R.1 (AUTHOR) patters@mse.ufl.edu |
| Source: | Acta Materialia. Jun2026, Vol. 311, pN.PAG-N.PAG. 1p. |
| Subjects: | Grain size, Microstructure, Aluminum alloys, Metal crystal growth, Crystal grain boundaries |
| Abstract: | Abnormal grain growth (AGG) in particulate structures has been experimentally studied and modeled for initiation from the pinned state and from normal grain growth, with different mechanisms and microstructural paths. From the pinned state AGG initiates after reduction in resisting pressure by particle coarsening and/or dissolution, releasing some grains to grow into the surrounding pinned structure until most of it is consumed. The boundary curvature and driving pressure of the abnormal grain increases with increasing number of faces as it grows, allowing it to progress unstopped into the structure from which it initiated. In the second case, during normal grain growth in the presence of a coarser particulate structure, the increasing grain size reduces driving pressure to the point of partial pinning with some grains continuing growth and hindering that of the abnormal grain, resulting in a broad size distribution, less extreme than in the first case. The initiation of these two variants is quantified in terms of a proposed unitless "grain anchorage" parameter, G A , that is the ratio of the resisting and driving pressures. A similar term has been proposed in prior 2D analytical models but has never been experimentally tested in 3D Experiments with aluminum alloy AA3105 containing soluble constituent particles and dispersoids showed abnormal growth initiating at consistent values of G A ≈ 4 for the NGG → AGG transition and ≈ 6 for Pinned → AGG over a range of temperatures, particulate structures and initiation times. These results should be general among particulate materials. [Display omitted] [ABSTRACT FROM AUTHOR] |
| Copyright of Acta Materialia is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 193199998 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Transition to abnormal grain growth from the pinned state and from normal growth. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Patterson%2C+Burton+R%2E%22">Patterson, Burton R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> patters@mse.ufl.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Acta+Materialia%22">Acta Materialia</searchLink>. Jun2026, Vol. 311, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Grain+size%22">Grain size</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum+alloys%22">Aluminum alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+crystal+growth%22">Metal crystal growth</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+grain+boundaries%22">Crystal grain boundaries</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abnormal grain growth (AGG) in particulate structures has been experimentally studied and modeled for initiation from the pinned state and from normal grain growth, with different mechanisms and microstructural paths. From the pinned state AGG initiates after reduction in resisting pressure by particle coarsening and/or dissolution, releasing some grains to grow into the surrounding pinned structure until most of it is consumed. The boundary curvature and driving pressure of the abnormal grain increases with increasing number of faces as it grows, allowing it to progress unstopped into the structure from which it initiated. In the second case, during normal grain growth in the presence of a coarser particulate structure, the increasing grain size reduces driving pressure to the point of partial pinning with some grains continuing growth and hindering that of the abnormal grain, resulting in a broad size distribution, less extreme than in the first case. The initiation of these two variants is quantified in terms of a proposed unitless "grain anchorage" parameter, G A , that is the ratio of the resisting and driving pressures. A similar term has been proposed in prior 2D analytical models but has never been experimentally tested in 3D Experiments with aluminum alloy AA3105 containing soluble constituent particles and dispersoids showed abnormal growth initiating at consistent values of G A ≈ 4 for the NGG → AGG transition and ≈ 6 for Pinned → AGG over a range of temperatures, particulate structures and initiation times. These results should be general among particulate materials. [Display omitted] [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Acta Materialia is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.actamat.2026.122176 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Grain size Type: general – SubjectFull: Microstructure Type: general – SubjectFull: Aluminum alloys Type: general – SubjectFull: Metal crystal growth Type: general – SubjectFull: Crystal grain boundaries Type: general Titles: – TitleFull: Transition to abnormal grain growth from the pinned state and from normal growth. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Patterson, Burton R. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 13596454 Numbering: – Type: volume Value: 311 Titles: – TitleFull: Acta Materialia Type: main |
| ResultId | 1 |
