Enhanced microstructure, mechanical properties, and thermal stability of powder metallurgy Al-Ni-Cu-Fe alloy through thermomechanical processing and recrystallization
Powder metallurgy (PM) Al-Ni-Cu-Fe alloys are promising for use as lightweight, heat-resistant structural components in automotive and industrial applications. However, their practical use is limited by interfacial inhomogeneities and second-phase segregation. To address these challenges, this study...
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Elsevier
2025-06-01
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| Series: | Materials Today Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590049825000268 |
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| author | Kai-Chieh Chang Chi-Fong Miu Fei-Yi Hung |
| author_facet | Kai-Chieh Chang Chi-Fong Miu Fei-Yi Hung |
| author_sort | Kai-Chieh Chang |
| collection | DOAJ |
| description | Powder metallurgy (PM) Al-Ni-Cu-Fe alloys are promising for use as lightweight, heat-resistant structural components in automotive and industrial applications. However, their practical use is limited by interfacial inhomogeneities and second-phase segregation. To address these challenges, this study implemented a novel three-stage post-sintering processing route comprising T4 solution pre-treatment, thermomechanical processing through hot rolling, and T6 aging. The T4 pretreatment promoted grain coarsening and reduced elemental segregation, thus improving alloy workability. Thermomechanical processing through hot rolling facilitated dynamic recrystallization, resulting in a uniform dispersion of secondary phases. The subsequent T6 aging refined the grains to an equiaxed structure and reduced the rolling-induced texture. As a result, the alloy achieved a tensile strength above 280 MPa, ∼7 % ductility, and maintained remarkable thermal stability below 200 °C. The strengthening was primarily attributed to grain-boundary pinning and hard-phase contributions from Al9FeNi and Al3(Zr, Sc), along with nano-precipitated Al2Cu and thermally stable quasi-periodic phases. These quasi-periodic phases formed semi-coherent interfaces with Al9FeNi and the matrix, serving as stress buffers to stabilize grain boundaries and enhance overall thermal stability. Together, these synergistic effects highlight the alloy's potential for high-temperature structural applications and provide insights to advance the development of heat-resistant PM aluminum alloys. |
| format | Article |
| id | doaj-art-e02bb25eac1440968550fc87fbf0b0fb |
| institution | OA Journals |
| issn | 2590-0498 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials Today Advances |
| spelling | doaj-art-e02bb25eac1440968550fc87fbf0b0fb2025-08-20T02:05:52ZengElsevierMaterials Today Advances2590-04982025-06-012610058110.1016/j.mtadv.2025.100581Enhanced microstructure, mechanical properties, and thermal stability of powder metallurgy Al-Ni-Cu-Fe alloy through thermomechanical processing and recrystallizationKai-Chieh Chang0Chi-Fong Miu1Fei-Yi Hung2Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 701, TaiwanDepartment of Materials Science and Engineering, National Cheng Kung University, Tainan, 701, TaiwanCorresponding author.; Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 701, TaiwanPowder metallurgy (PM) Al-Ni-Cu-Fe alloys are promising for use as lightweight, heat-resistant structural components in automotive and industrial applications. However, their practical use is limited by interfacial inhomogeneities and second-phase segregation. To address these challenges, this study implemented a novel three-stage post-sintering processing route comprising T4 solution pre-treatment, thermomechanical processing through hot rolling, and T6 aging. The T4 pretreatment promoted grain coarsening and reduced elemental segregation, thus improving alloy workability. Thermomechanical processing through hot rolling facilitated dynamic recrystallization, resulting in a uniform dispersion of secondary phases. The subsequent T6 aging refined the grains to an equiaxed structure and reduced the rolling-induced texture. As a result, the alloy achieved a tensile strength above 280 MPa, ∼7 % ductility, and maintained remarkable thermal stability below 200 °C. The strengthening was primarily attributed to grain-boundary pinning and hard-phase contributions from Al9FeNi and Al3(Zr, Sc), along with nano-precipitated Al2Cu and thermally stable quasi-periodic phases. These quasi-periodic phases formed semi-coherent interfaces with Al9FeNi and the matrix, serving as stress buffers to stabilize grain boundaries and enhance overall thermal stability. Together, these synergistic effects highlight the alloy's potential for high-temperature structural applications and provide insights to advance the development of heat-resistant PM aluminum alloys.http://www.sciencedirect.com/science/article/pii/S2590049825000268Powder metallurgy (PM)Al-Ni-Cu-Fe alloyThermomechanical processing (TMP)Mechanical propertiesThermal stabilityQuasi-symmetry phase |
| spellingShingle | Kai-Chieh Chang Chi-Fong Miu Fei-Yi Hung Enhanced microstructure, mechanical properties, and thermal stability of powder metallurgy Al-Ni-Cu-Fe alloy through thermomechanical processing and recrystallization Materials Today Advances Powder metallurgy (PM) Al-Ni-Cu-Fe alloy Thermomechanical processing (TMP) Mechanical properties Thermal stability Quasi-symmetry phase |
| title | Enhanced microstructure, mechanical properties, and thermal stability of powder metallurgy Al-Ni-Cu-Fe alloy through thermomechanical processing and recrystallization |
| title_full | Enhanced microstructure, mechanical properties, and thermal stability of powder metallurgy Al-Ni-Cu-Fe alloy through thermomechanical processing and recrystallization |
| title_fullStr | Enhanced microstructure, mechanical properties, and thermal stability of powder metallurgy Al-Ni-Cu-Fe alloy through thermomechanical processing and recrystallization |
| title_full_unstemmed | Enhanced microstructure, mechanical properties, and thermal stability of powder metallurgy Al-Ni-Cu-Fe alloy through thermomechanical processing and recrystallization |
| title_short | Enhanced microstructure, mechanical properties, and thermal stability of powder metallurgy Al-Ni-Cu-Fe alloy through thermomechanical processing and recrystallization |
| title_sort | enhanced microstructure mechanical properties and thermal stability of powder metallurgy al ni cu fe alloy through thermomechanical processing and recrystallization |
| topic | Powder metallurgy (PM) Al-Ni-Cu-Fe alloy Thermomechanical processing (TMP) Mechanical properties Thermal stability Quasi-symmetry phase |
| url | http://www.sciencedirect.com/science/article/pii/S2590049825000268 |
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