Kube, Sebastian A.
Cha, Judy J.
Ellen Scanley, B.
Kiminami, Claudio S.
Botta, Walter J.
Número total de Autores: 10
Afiliação do(s) autor(es):
 Univ Fed Sao Carlos, Programa Posgrad Ciencia & Engn Mat, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
 Univ Fed Minas Gerais, Dept Engn Met & Mat, Av Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG - Brazil
 Yale Univ, Dept Mech Engn & Mat Sci, New Haven, CT 06511 - USA
 Southern Connecticut State Univ, Dept Phys, New Haven, CT 06515 - USA
 Univ Fed Sao Carlos, Dept Engn Mat, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 5
Tipo de documento:
MAY 9 2019.
Citações Web of Science:
Aluminum-based quasicrystals typically form across narrow composition ranges within binary to quaternary alloys, which makes their fabrication and characterization challenging. Here, we use combinatorial approaches together with fast characterization techniques to study a wide compositional range including known quasicrystal forming compositions. Specifically, we use magnetron cosputtering to fabricate libraries of similar to 140 Al-Cu-Fe and similar to 300 Al-Cu-Fe-Cr alloys. The alloys compositions are measured through automated energy dispersive X-ray spectroscopy. Phase formation and thermal stability are investigated for different thermal processing conditions (as-sputtered and annealed at 400 degrees C, 520 degrees C and 600 degrees C for Al-Cu-Fe libraries; annealed at 600 degrees C for Al-Cu-Fe-Cr libraries) using automated X-ray diffraction and transmission electron microscopy. In both systems the compositional regions across which the quasicrystalline phase forms are identified. In particular, we demonstrate that the quasicrystalline phase forms across an unusually broad composition range in the Al-Cu-Fe-Cr system. Additionally, some of the considered alloys vitrify during sputtering, which also allows us to study their nucleation behavior. We find that phases with polytetrahedral symmetry, such as the icosahedral quasicrystal and the lambda-Al13Fe4 phase, exhibit higher nucleation rates but lower growth rates, as compared to other phases with a lower degree of polytetrahedral order. Altogether, the here used combinatorial approach is powerful to identify compositional regions of quasicrystals. (AU)