Ageing of Al-Mn-Cu-Be Alloys for Stimulating Precipitation of Icosahedral Quasicrystals
In this work, the ageing of some Al-Mn-Cu-Be alloys was investigated in the temperature range in which predominantly icosahedral quasicrystalline (IQC) precipitates can form. The alloys were cast into a copper mould, directly aged (T5 heat treatment) between 300 and 440 °C for different times. After...
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MDPI AG
2020-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/10/7/937 |
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| author | Tonica Bončina Mihaela Albu Franc Zupanič |
| author_facet | Tonica Bončina Mihaela Albu Franc Zupanič |
| author_sort | Tonica Bončina |
| collection | DOAJ |
| description | In this work, the ageing of some Al-Mn-Cu-Be alloys was investigated in the temperature range in which predominantly icosahedral quasicrystalline (IQC) precipitates can form. The alloys were cast into a copper mould, directly aged (T5 heat treatment) between 300 and 440 °C for different times. Afterwards, they were examined using scanning and transmission electron microscopy, X-ray diffraction and hardness testing. The main aim of the work was to determine the conditions at which a high number density of spherical icosahedral quasicrystalline precipitates can form. The highest number density of IQC precipitates was obtained at 300 °C after prolonged ageing. The spheroidal precipitates had a diameter less than 20 nm. The size of IQC precipitates increased with the increasing temperature, and in addition, decagonal quasicrystalline precipitates appeared. The time to maximum hardness decreased strongly with increasing ageing temperature. The IQC precipitates can form in a fairly broad temperature range in Al-Mn-Cu-Be alloys and that by varying ageing temperature and duration, rather different distributions of precipitates can be obtained. The presence of precipitates caused rather strong aluminium alloys and fast work hardening during initial plastic deformation. |
| first_indexed | 2024-03-10T18:32:58Z |
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| id | doaj.art-d1ad61341ca34c9299f64b5e41bdb6d7 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T18:32:58Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-d1ad61341ca34c9299f64b5e41bdb6d72023-11-20T06:31:51ZengMDPI AGMetals2075-47012020-07-0110793710.3390/met10070937Ageing of Al-Mn-Cu-Be Alloys for Stimulating Precipitation of Icosahedral QuasicrystalsTonica Bončina0Mihaela Albu1Franc Zupanič2Faculty of Mechanical Engineering, University of Maribor, SI-2000 Maribor, SloveniaGraz Centre for Electron Microscopy, A-8010 Graz, AustriaFaculty of Mechanical Engineering, University of Maribor, SI-2000 Maribor, SloveniaIn this work, the ageing of some Al-Mn-Cu-Be alloys was investigated in the temperature range in which predominantly icosahedral quasicrystalline (IQC) precipitates can form. The alloys were cast into a copper mould, directly aged (T5 heat treatment) between 300 and 440 °C for different times. Afterwards, they were examined using scanning and transmission electron microscopy, X-ray diffraction and hardness testing. The main aim of the work was to determine the conditions at which a high number density of spherical icosahedral quasicrystalline precipitates can form. The highest number density of IQC precipitates was obtained at 300 °C after prolonged ageing. The spheroidal precipitates had a diameter less than 20 nm. The size of IQC precipitates increased with the increasing temperature, and in addition, decagonal quasicrystalline precipitates appeared. The time to maximum hardness decreased strongly with increasing ageing temperature. The IQC precipitates can form in a fairly broad temperature range in Al-Mn-Cu-Be alloys and that by varying ageing temperature and duration, rather different distributions of precipitates can be obtained. The presence of precipitates caused rather strong aluminium alloys and fast work hardening during initial plastic deformation.https://www.mdpi.com/2075-4701/10/7/937aluminiumageingquasicrystaltransmission electron microscopy |
| spellingShingle | Tonica Bončina Mihaela Albu Franc Zupanič Ageing of Al-Mn-Cu-Be Alloys for Stimulating Precipitation of Icosahedral Quasicrystals Metals aluminium ageing quasicrystal transmission electron microscopy |
| title | Ageing of Al-Mn-Cu-Be Alloys for Stimulating Precipitation of Icosahedral Quasicrystals |
| title_full | Ageing of Al-Mn-Cu-Be Alloys for Stimulating Precipitation of Icosahedral Quasicrystals |
| title_fullStr | Ageing of Al-Mn-Cu-Be Alloys for Stimulating Precipitation of Icosahedral Quasicrystals |
| title_full_unstemmed | Ageing of Al-Mn-Cu-Be Alloys for Stimulating Precipitation of Icosahedral Quasicrystals |
| title_short | Ageing of Al-Mn-Cu-Be Alloys for Stimulating Precipitation of Icosahedral Quasicrystals |
| title_sort | ageing of al mn cu be alloys for stimulating precipitation of icosahedral quasicrystals |
| topic | aluminium ageing quasicrystal transmission electron microscopy |
| url | https://www.mdpi.com/2075-4701/10/7/937 |
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