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    Early Stages of Precipitation Process in Al-(Mn-)Sc-Zr Alloy Characterized by Positron Annihilation

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    Type
    Article
    Authors
    Vlach, Martin
    Cizek, Jakub
    Melikhova, Oksana
    Stulikova, Ivana
    Smola, Bohumil
    Kekule, Tomas
    Kudrnova, Hana
    Gemma, Ryota
    Neubert, Volkmar
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Thin Films & Characterization
    Date
    2015-01-29
    Online Publication Date
    2015-01-29
    Print Publication Date
    2015-04
    Permanent link to this record
    http://hdl.handle.net/10754/346766
    
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    Abstract
    Thermal effects on the precipitation stages in as-cast Al-0.70 at. pct Mn-0.15 at. pct Sc-0.05 at. pct Zr alloy were studied. The role of lattice defects was elucidated by positron annihilation spectroscopy (lifetime and coincidence Doppler broadening) enabling investigation of solutes clustering at the atomic scale. This technique has never been used in the Al-Sc- and/or Al-Zr-based alloys so far. Studies by positron annihilation were combined with resistometry, hardness measurements, and microstructure observations. Positrons trapped at defects are preferentially annihilated by Sc electrons. Lifetime of trapped positrons indicates that Sc atoms segregate at dislocations. Maximum fraction of positrons annihilated by Sc electrons occurring at 453 K (180 °C) suggests that clustering of Sc bound with vacancies takes place. It is followed by peak of this fraction at 573 K (300 °C). A rise of the contribution of trapped positrons annihilated by Zr electrons starting at 513 K (240 °C) and attaining maximum also at 573 K (300 °C) confirms that Zr participates in precipitation of the Al3Sc particles already at these temperatures. The pronounced hardening at 573 K (300 °C) has its nature in the precipitation of the Al3Sc particles with a Zr-rich shell. The contribution of trapped positrons annihilated by Mn electrons was found to be negligible. © 2015, The Minerals, Metals & Materials Society and ASM International.
    Citation
    Early Stages of Precipitation Process in Al-(Mn-)Sc-Zr Alloy Characterized by Positron Annihilation 2015, 46 (4):1556 Metallurgical and Materials Transactions A
    Publisher
    Springer Nature
    Journal
    Metallurgical and Materials Transactions A
    DOI
    10.1007/s11661-015-2767-x
    Additional Links
    http://link.springer.com/10.1007/s11661-015-2767-x
    ae974a485f413a2113503eed53cd6c53
    10.1007/s11661-015-2767-x
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division

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