# Co-precipitation strengthening behavior on paint-baked Al–Mg–Si–Cu aluminium alloys under combined pre- and natural ageing

https://mdr.nims.go.jp/datasets/5b47ecd0-3f14-4f92-b747-b1c1e7c2498b

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## Id

5b47ecd0-3f14-4f92-b747-b1c1e7c2498b

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-04-27T02:54:44.248038Z

## Updated at

2026-04-27T04:19:07.724662Z

## Published at

2026-04-27T05:25:21.266653Z

## Doi



## First published url

https://doi.org/10.1016/j.jmrt.2026.02.065

## Date published

2026-02-10

## Recorded date published

2026-3

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Co-precipitation strengthening behavior on paint-baked Al–Mg–Si–Cu aluminium
    alloys under combined pre- and natural ageing
  title_type: original
  lang: en

## Description

- description: Optimizing the interplay between pre-ageing (PA), natural ageing (NA),
    and paint-baking (PB) is critical for enhancing the precipitation hardening of
    Al-Mg-Si-Cu alloys. This study investigates the multiphase precipitation kinetics
    in an Al-0.7Si-0.9Mg-0.2Cu (wt%) alloy subjected to PA (80 °C for 1 h), varying
    NA durations (1–30 days), and PB (180 °C for 30 min). By combining synchrotron
    small-angle X-ray scattering (SAXS) with high-resolution transmission/scanning
    transmission electron microscopy (TEM/STEM) characterization, we reveal two governing
    mechanisms responsible for the superior mechanical performance. First, prolonged
    NA (30 days) promotes the atomic-scale ordering of GP zones. Initially disordered
    clusters evolve into ordered configurations containing Si/Cu-rich layers, effectively
    reducing the thermodynamic barrier for β''/β' precipitation during subsequent
    baking. Second, we elucidate a strain-induced selective nucleation mechanism for
    θ'/Q' phases along dislocations. Continuous solute segregations transition into
    segmented precursors, where only variants satisfying crystallographic matching
    conditions undergo growth into discrete precipitates. This hierarchical microstructure,
    comprising dense β''/β' in the matrix and discrete θ'/Q' along dislocations, enhances
    both strength and ductility. The optimized processing yields an ultimate tensile
    strength of ~249 MPa with excellent ductility (~19.6%), demonstrating that the
    strategic application of prolonged NA can effectively tailor precipitate architecture
    in Al-Mg-Si-Cu alloys.
  description_type: abstract
  lang: und

## Creator

- name: Wei-Yi Yang
  role: author
- name: Ching-Wen Yeh
  role: author
- name: Seiichiro Ii
  role: author
  orcid: https://orcid.org/0000-0003-3999-384X
- name: R. Devesh Kumar Misra
  role: author
- name: Po-Kai Chiu
  role: author
- name: Tsai-Fu Chung
  role: author
  orcid: https://orcid.org/0000-0001-8962-4992

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: Al–Mg–Si–Cu aluminum alloys
  schema: not_defined
- subject: Pre-ageing
  schema: not_defined
- subject: Prolonged natural ageing
  schema: not_defined
- subject: Paint-baking
  schema: not_defined
- subject: Multiphasic Co-precipitation
  schema: not_defined
- subject: Strain-induced selective nucleation mechanism
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Journal of Materials Research and Technology
  issn: '22387854'
  volume: '41'
  start_page: 4558
  end_page: 4574

## Conference



## Related item



## Funding

- funder_name: National Science and Technology Council

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



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## Custom property



## Fileset

- id: 99376d81-ef57-47df-9b14-5824ec9d38f0
  filename: 1-s2.0-S2238785426003145-main.pdf
  content_type: application/pdf
  size: 28320012
  md5: 8c51a0da117ab50a4eab105f4f7ba473

## Thumbnail

fileset_id: 99376d81-ef57-47df-9b14-5824ec9d38f0
filename: 1-s2.0-S2238785426003145-main.pdf