Phenomenological understanding of the contribution of bulk and grain boundary precipitates on strengthening in prolonged-aged Al-Zn-Mg-Cu aluminium alloys
This study is aimed at elucidating the mechanistic impact of structural evolution of bulk and grain boundary precipitates on the strength-ductility balance in prolonged artificial aged Al-Zn-Mg-Cu alloys. Combining aberration-corrected scanning transmission electron microscopy and first-principles c...
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2025-03-01
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590049825000025 |
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| author | Cheng-Ling Tai Yu-Ning Chiu Chu-Jen Chen Shih-Kang Lin Hsin-Chih Lin R. Devesh Kumar Misra Yo-Lun Yang Chien-Nan Hsiao Cheng-Si Tsao Tsai-Fu Chung |
| author_facet | Cheng-Ling Tai Yu-Ning Chiu Chu-Jen Chen Shih-Kang Lin Hsin-Chih Lin R. Devesh Kumar Misra Yo-Lun Yang Chien-Nan Hsiao Cheng-Si Tsao Tsai-Fu Chung |
| author_sort | Cheng-Ling Tai |
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| description | This study is aimed at elucidating the mechanistic impact of structural evolution of bulk and grain boundary precipitates on the strength-ductility balance in prolonged artificial aged Al-Zn-Mg-Cu alloys. Combining aberration-corrected scanning transmission electron microscopy and first-principles calculations, the transition of bulk η-phase precipitates, which originated at Zn-terminated interfaces under tensile lattice strain field, was fundamentally explored. Intriguingly, as ageing progressed, significant partitioning of solute-Cu along the interfaces initiated a stacking transition in η-phase from hexagonal C14 to cubic C15 via di-hexagonal C36 Laves phase structures, leading to a reduction in lattice misfit strengthening. The driving mechanism behind this Laves phase transformation was found to link to interfacial lattice strain and Cu solute atom partitioning. Meanwhile, the aspect ratio of grain boundary S-phase precipitates that sporadically developed from the interconnected clusters present along the grain boundaries was progressively increased with ageing time, contributing to improved mechanical stability of grain boundary precipitates. Prolonged ageing led to a small decrease in tensile strength from 567 MPa to 526 MPa and minor increase in elongation from ∼11 % to ∼13 %. The new knowledge derived from the present study has the potential to transform the futuristic design and processing of next generation of aluminum alloys through tailoring of tensile strength and ductility, where the approach will be different from the conventional ageing process. |
| format | Article |
| id | doaj-art-bb22ff59f2d149b6983e04ec98a4aed0 |
| institution | Kabale University |
| issn | 2590-0498 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials Today Advances |
| spelling | doaj-art-bb22ff59f2d149b6983e04ec98a4aed02025-01-31T05:12:19ZengElsevierMaterials Today Advances2590-04982025-03-0125100557Phenomenological understanding of the contribution of bulk and grain boundary precipitates on strengthening in prolonged-aged Al-Zn-Mg-Cu aluminium alloysCheng-Ling Tai0Yu-Ning Chiu1Chu-Jen Chen2Shih-Kang Lin3Hsin-Chih Lin4R. Devesh Kumar Misra5Yo-Lun Yang6Chien-Nan Hsiao7Cheng-Si Tsao8Tsai-Fu Chung9Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, TaiwanDepartment of Materials Science and Engineering, National Cheng Kung University, Tainan, 70101, TaiwanDepartment of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan; Department of Materials Science and Engineering, National Taiwan University, Taipei, TaiwanDepartment of Materials Science and Engineering, National Cheng Kung University, Tainan, 70101, TaiwanDepartment of Materials Science and Engineering, National Taiwan University, Taipei, TaiwanDepartment of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, 500 W. University Avenue, El Paso, TX, 79968, USADepartment of Mechanical Engineering, National Taipei University of Technology, Taipei, TaiwanNational Applied Research Laboratories, Taiwan Instrument Research Institute, Hsinchu, TaiwanNational Synchrotron Radiation Research Center, Hsinchu, TaiwanDepartment of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan; High Entropy Materials Center, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan; Corresponding author. Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan.This study is aimed at elucidating the mechanistic impact of structural evolution of bulk and grain boundary precipitates on the strength-ductility balance in prolonged artificial aged Al-Zn-Mg-Cu alloys. Combining aberration-corrected scanning transmission electron microscopy and first-principles calculations, the transition of bulk η-phase precipitates, which originated at Zn-terminated interfaces under tensile lattice strain field, was fundamentally explored. Intriguingly, as ageing progressed, significant partitioning of solute-Cu along the interfaces initiated a stacking transition in η-phase from hexagonal C14 to cubic C15 via di-hexagonal C36 Laves phase structures, leading to a reduction in lattice misfit strengthening. The driving mechanism behind this Laves phase transformation was found to link to interfacial lattice strain and Cu solute atom partitioning. Meanwhile, the aspect ratio of grain boundary S-phase precipitates that sporadically developed from the interconnected clusters present along the grain boundaries was progressively increased with ageing time, contributing to improved mechanical stability of grain boundary precipitates. Prolonged ageing led to a small decrease in tensile strength from 567 MPa to 526 MPa and minor increase in elongation from ∼11 % to ∼13 %. The new knowledge derived from the present study has the potential to transform the futuristic design and processing of next generation of aluminum alloys through tailoring of tensile strength and ductility, where the approach will be different from the conventional ageing process.http://www.sciencedirect.com/science/article/pii/S2590049825000025Aberration-corrected scanning transmission electron microscopyAtomic-resolution strain mappingFirst-principles calculationsNanoprecipitateGrain boundary precipitateAl-Zn-Mg-Cu aluminium alloys |
| spellingShingle | Cheng-Ling Tai Yu-Ning Chiu Chu-Jen Chen Shih-Kang Lin Hsin-Chih Lin R. Devesh Kumar Misra Yo-Lun Yang Chien-Nan Hsiao Cheng-Si Tsao Tsai-Fu Chung Phenomenological understanding of the contribution of bulk and grain boundary precipitates on strengthening in prolonged-aged Al-Zn-Mg-Cu aluminium alloys Materials Today Advances Aberration-corrected scanning transmission electron microscopy Atomic-resolution strain mapping First-principles calculations Nanoprecipitate Grain boundary precipitate Al-Zn-Mg-Cu aluminium alloys |
| title | Phenomenological understanding of the contribution of bulk and grain boundary precipitates on strengthening in prolonged-aged Al-Zn-Mg-Cu aluminium alloys |
| title_full | Phenomenological understanding of the contribution of bulk and grain boundary precipitates on strengthening in prolonged-aged Al-Zn-Mg-Cu aluminium alloys |
| title_fullStr | Phenomenological understanding of the contribution of bulk and grain boundary precipitates on strengthening in prolonged-aged Al-Zn-Mg-Cu aluminium alloys |
| title_full_unstemmed | Phenomenological understanding of the contribution of bulk and grain boundary precipitates on strengthening in prolonged-aged Al-Zn-Mg-Cu aluminium alloys |
| title_short | Phenomenological understanding of the contribution of bulk and grain boundary precipitates on strengthening in prolonged-aged Al-Zn-Mg-Cu aluminium alloys |
| title_sort | phenomenological understanding of the contribution of bulk and grain boundary precipitates on strengthening in prolonged aged al zn mg cu aluminium alloys |
| topic | Aberration-corrected scanning transmission electron microscopy Atomic-resolution strain mapping First-principles calculations Nanoprecipitate Grain boundary precipitate Al-Zn-Mg-Cu aluminium alloys |
| url | http://www.sciencedirect.com/science/article/pii/S2590049825000025 |
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