Microstructure and Mechanical Properties at Elevated Temperature of Powder Metallurgy Al-Zn-Mg-Cu Alloy Subjected to Hot Extrusion
In this work, Al-Zn-Mg-Cu powders containing 0.15 and 0.33 wt % oxygen were utilized to prepare high-strength aluminum alloys through the process of cold isostatic pressing, sintering, hot extrusion, and heat treatment. Microstructural and mechanical properties at elevated temperatures of 250, 350,...
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| Format: | Article |
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MDPI AG
2022-01-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/2/259 |
| _version_ | 1797478063208923136 |
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| author | Weihao Han Yang Li Pei Li Guoping Su Chenzeng Zhang Chunfang Sun Cunguang Chen Fang Yang Zhimeng Guo |
| author_facet | Weihao Han Yang Li Pei Li Guoping Su Chenzeng Zhang Chunfang Sun Cunguang Chen Fang Yang Zhimeng Guo |
| author_sort | Weihao Han |
| collection | DOAJ |
| description | In this work, Al-Zn-Mg-Cu powders containing 0.15 and 0.33 wt % oxygen were utilized to prepare high-strength aluminum alloys through the process of cold isostatic pressing, sintering, hot extrusion, and heat treatment. Microstructural and mechanical properties at elevated temperatures of 250, 350, and 450 °C were investigated by scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and high-temperature tensile tests. Results showed that the tensile strengths of the obtained Al-Zn-Mg-Cu alloys with 0.15 wt % oxygen were 185, 46, and 18 MPa at 250, 350, and 450 °C, respectively. When the oxygen content of Al-Zn-Mg-Cu alloy rose to 0.33 wt %, the tensile strengths at the corresponding temperature reached up to 205, 68, and 25 MPa, respectively. The excellent high-temperature performance could be attributed to double hindrance to dislocation motion and grain boundary migration by a large amount of nano γ-Al<sub>2</sub>O<sub>3</sub> created by the in-creased oxygen, thereby resulting in fine grains even at high temperatures. |
| first_indexed | 2024-03-09T21:26:42Z |
| format | Article |
| id | doaj.art-8fe31dbd96074e5fb7dd06dbc15361fd |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T21:26:42Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-8fe31dbd96074e5fb7dd06dbc15361fd2023-11-23T21:07:31ZengMDPI AGMetals2075-47012022-01-0112225910.3390/met12020259Microstructure and Mechanical Properties at Elevated Temperature of Powder Metallurgy Al-Zn-Mg-Cu Alloy Subjected to Hot ExtrusionWeihao Han0Yang Li1Pei Li2Guoping Su3Chenzeng Zhang4Chunfang Sun5Cunguang Chen6Fang Yang7Zhimeng Guo8Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaIn this work, Al-Zn-Mg-Cu powders containing 0.15 and 0.33 wt % oxygen were utilized to prepare high-strength aluminum alloys through the process of cold isostatic pressing, sintering, hot extrusion, and heat treatment. Microstructural and mechanical properties at elevated temperatures of 250, 350, and 450 °C were investigated by scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and high-temperature tensile tests. Results showed that the tensile strengths of the obtained Al-Zn-Mg-Cu alloys with 0.15 wt % oxygen were 185, 46, and 18 MPa at 250, 350, and 450 °C, respectively. When the oxygen content of Al-Zn-Mg-Cu alloy rose to 0.33 wt %, the tensile strengths at the corresponding temperature reached up to 205, 68, and 25 MPa, respectively. The excellent high-temperature performance could be attributed to double hindrance to dislocation motion and grain boundary migration by a large amount of nano γ-Al<sub>2</sub>O<sub>3</sub> created by the in-creased oxygen, thereby resulting in fine grains even at high temperatures.https://www.mdpi.com/2075-4701/12/2/259powder metallurgyAl-Zn-Mg-Cu alloyhigh temperature strengthoxygen content |
| spellingShingle | Weihao Han Yang Li Pei Li Guoping Su Chenzeng Zhang Chunfang Sun Cunguang Chen Fang Yang Zhimeng Guo Microstructure and Mechanical Properties at Elevated Temperature of Powder Metallurgy Al-Zn-Mg-Cu Alloy Subjected to Hot Extrusion Metals powder metallurgy Al-Zn-Mg-Cu alloy high temperature strength oxygen content |
| title | Microstructure and Mechanical Properties at Elevated Temperature of Powder Metallurgy Al-Zn-Mg-Cu Alloy Subjected to Hot Extrusion |
| title_full | Microstructure and Mechanical Properties at Elevated Temperature of Powder Metallurgy Al-Zn-Mg-Cu Alloy Subjected to Hot Extrusion |
| title_fullStr | Microstructure and Mechanical Properties at Elevated Temperature of Powder Metallurgy Al-Zn-Mg-Cu Alloy Subjected to Hot Extrusion |
| title_full_unstemmed | Microstructure and Mechanical Properties at Elevated Temperature of Powder Metallurgy Al-Zn-Mg-Cu Alloy Subjected to Hot Extrusion |
| title_short | Microstructure and Mechanical Properties at Elevated Temperature of Powder Metallurgy Al-Zn-Mg-Cu Alloy Subjected to Hot Extrusion |
| title_sort | microstructure and mechanical properties at elevated temperature of powder metallurgy al zn mg cu alloy subjected to hot extrusion |
| topic | powder metallurgy Al-Zn-Mg-Cu alloy high temperature strength oxygen content |
| url | https://www.mdpi.com/2075-4701/12/2/259 |
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