The formation of quasicrystals in Al-Cu-Fe-(M=Cr, Ni) melt-spun ribbons

Autor(es)

Wolf, W. ^[1] ; Coury, F. G. ^[2] ; Kaufman, M. J. ^[2] ; Bolfarini, C. ^[3] ; Kiminami, C. S. ^[3] ; Botta, W. J. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Programa Posgrad Ciencia & Engn Mat, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Colorado Sch Mines, Dept Met & Mat Engn, Golden, CO 80401 - USA

^[3] Univ Fed Sao Carlos, Dept Engn Mat, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 731, p. 1288-1294, JAN 15 2018.
• Citações Web of Science: 3

Resumo

The influence of Cr and Ni additions in rapidly-solidified Al-Cu-Fe alloys was investigated. Four compositions, namely, Al64Cu20Fe13Ni3, Al63Cu18Fe10Ni9, Al65Cu22Fe10Cr3 and Al67Cu20Fe5Cr8 were selected based on a methodology in which the average valence electron per atom (e/a) ratio of the ternary Al-Cu-Fe quasicrystal was maintained constant. Melt-spun ribbons of all four alloys were produced and then examined by X-ray diffraction, transmission electron microscopy and energy dispersive X-ray spectroscopy. The results indicate that the Al-Cu-Fe icosahedral quasicrystalline phase has limited solubility for Ni such that with increasing Ni content, the fraction of the quasicrystalline phase decreased drastically and two primitive B2 cubic phases were formed instead. Additions of Cr resulted in the formation of a decagonal quasicrystal at the expense of the icosahedral phase. At 3 at% Cr, both icosahedral and decagonal phases were observed, with the former having the major volume fraction. For the alloy containing 8 at% Cr, only the decagonal phase was observed. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/05987-8 - Processamento e caracterização de ligas metálicas amorfas, metaestáveis e nano-estruturadas
• Beneficiário: Claudio Shyinti Kiminami
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/09008-0 - Fabricação de ligas de alumínio com fases quasicristalinas e intermetálicas com baixo coeficiente de atrito e baixa energia de adesão superficial para aplicação como revestimentos na indústria petroquímica
• Beneficiário: Witor Wolf
• Modalidade de apoio: Bolsas no Brasil - Doutorado