Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 50: Topical Session Modern Atom Probe Tomography IV - Thin Films and Structural Materials
MM 50.5: Vortrag
Donnerstag, 29. März 2012, 12:45–13:00, H 0107
The influence of Cu on the microstructure of AlCoCrFeNi high entropy alloys — •Anna Manzoni1, Nelia Wanderka1, Sheela Singh1, Haneen Daoud2, Rainer Völkl2, Uwe Glatzel2, B.S. Murty3, and John Banhart1 — 1Helmholtz-Zentrum Berlin, Berlin, Germany — 2Metallische Werkstoffe (Metals and Alloys), University Bayreuth, Bayreuth, Germany — 3Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, India
The microstructure of the five element equiatomic AlCoCrFeNi high entropy alloy is compared to the microstructure of six element equiatomic AlCoCrCuFeNi. The influence of Cu on the local microstructure as well as on the local concentration is investigated by SEM, TEM and atom probe tomography. Both as-cast alloys decompose into a dendritic and an interdendritic region. While the six elements alloy shows several Cu-precipitates in both the interdendritic and the dendritic region in addition to Al-Ni and Fe-Cr rich phases, the five elements alloy can be characterized by only two phases both in the dendritic and the interdendritic region. These Al-Ni rich and Fe-Cr rich phases in the AlCoCrFeNi show a very similar composition to those in the AlCoCrCuFeNi alloy. The influence of Cu seems to be limited to the creation of precipitates and to have no influence on the formation of the rest of the microstructure.