On the Sc-rich core of Al3(Sc,Er,Zr) precipitates
•Sc atoms tend to segregate at dislocations.•Two groups of precipitates are formed upon aging at 600 °C one of which has a distinct core rich in Sc.•After 2 and 4 h of aging at 600 °C trapped positrons are mostly annihilated by Zr electrons. The development of microstructure in an Al–Sc–Er–Zr alloy...
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| Published in | Materials letters Vol. 325; p. 132759 |
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| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
15.10.2022
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| Subjects | |
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| Abstract | •Sc atoms tend to segregate at dislocations.•Two groups of precipitates are formed upon aging at 600 °C one of which has a distinct core rich in Sc.•After 2 and 4 h of aging at 600 °C trapped positrons are mostly annihilated by Zr electrons.
The development of microstructure in an Al–Sc–Er–Zr alloy during aging at 600 °C was investigated utilizing microhardness measurements, positron annihilation spectroscopy (PAS) and (scanning) transmission electron microscopy ((S)TEM). The results of positron lifetime (LT) spectroscopy and coincidence Doppler broadening (CBD) indicate that Sc atoms segregate at dislocations. Two major groups of precipitates were observed after 4 h of aging at 600 °C, one having the usual Er-rich core, Sc-rich inner shell and Zr rich outer shell structure and the other having a core rich in Sc. |
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| AbstractList | •Sc atoms tend to segregate at dislocations.•Two groups of precipitates are formed upon aging at 600 °C one of which has a distinct core rich in Sc.•After 2 and 4 h of aging at 600 °C trapped positrons are mostly annihilated by Zr electrons.
The development of microstructure in an Al–Sc–Er–Zr alloy during aging at 600 °C was investigated utilizing microhardness measurements, positron annihilation spectroscopy (PAS) and (scanning) transmission electron microscopy ((S)TEM). The results of positron lifetime (LT) spectroscopy and coincidence Doppler broadening (CBD) indicate that Sc atoms segregate at dislocations. Two major groups of precipitates were observed after 4 h of aging at 600 °C, one having the usual Er-rich core, Sc-rich inner shell and Zr rich outer shell structure and the other having a core rich in Sc. |
| ArticleNumber | 132759 |
| Author | Vlach, Martin Kudrnová, Hana Leibner, Michal Lukáč, František Veselý, Jozef Kodetová, Veronika Čížek, Jakub |
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| CitedBy_id | crossref_primary_10_1016_j_jallcom_2024_177927 crossref_primary_10_1016_j_jallcom_2024_178406 crossref_primary_10_1016_j_mtcomm_2023_107341 crossref_primary_10_1016_j_jmrt_2023_11_117 crossref_primary_10_1016_j_jallcom_2023_169710 crossref_primary_10_1177_02670836241249251 crossref_primary_10_3390_cryst13081228 |
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| SubjectTerms | Al3(Sc,Er,Zr) Al–Sc–Er–Zr alloy Core–shell PAS TEM |
| Title | On the Sc-rich core of Al3(Sc,Er,Zr) precipitates |
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