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http://dx.doi.org/10.18419/opus-11399
Autor(en): | Gupta, Ankit Tas, Bengü Korbmacher, Dominique Dutta, Biswanath Neitzel, Yulia Grabowski, Blazej Hickel, Tilmann Esin, Vladimir Divinski, Sergiy V. Wilde, Gerhard Neugebauer, Jörg |
Titel: | A combined experimental and first-principles based assessment of finite-temperature thermodynamic properties of intermetallic Al3Sc |
Erscheinungsdatum: | 2021 |
Dokumentart: | Zeitschriftenartikel |
Seiten: | 19 |
Erschienen in: | Materials 14 (2021), No. 1837 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-114162 http://elib.uni-stuttgart.de/handle/11682/11416 http://dx.doi.org/10.18419/opus-11399 |
ISSN: | 1996-1944 |
Zusammenfassung: | We present a first-principles assessment of the finite-temperature thermodynamic properties of the intermetallic Al3Sc phase including the complete spectrum of excitations and compare the theoretical findings with our dilatometric and calorimetric measurements. While significant electronic contributions to the heat capacity and thermal expansion are observed near the melting temperature, anharmonic contributions, and electron–phonon coupling effects are found to be relatively small. On the one hand, these accurate methods are used to demonstrate shortcomings of empirical predictions of phase stabilities such as the Neumann–Kopp rule. On the other hand, their combination with elasticity theory was found to provide an upper limit for the size of Al3Sc nanoprecipitates needed to maintain coherency with the host matrix. The chemo-mechanical coupling being responsible for the coherency loss of strengthening precipitates is revealed by a combination of state-of-the-art simulations and dedicated experiments. These findings can be exploited to fine-tune the microstructure of Al-Sc-based alloys to approach optimum mechanical properties |
Enthalten in den Sammlungen: | 03 Fakultät Chemie |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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materials-14-01837-v2 (1).pdf | 2,49 MB | Adobe PDF | Öffnen/Anzeigen |
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