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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Insight into the complex ternary phase behavior in Al-Mn-Ce alloys

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Author(s):
Coury, Francisco Gil [1] ; Pires, Elcio L. [2] ; Wolf, Witor [2] ; Paes de Almeida, Fernando H. [2] ; Costa e Silva, Andre Luiz [3] ; Botta, Walter J. [2] ; Kiminami, Claudio S. [2] ; Kaufman, Michael J. [1]
Total Authors: 8
Affiliation:
[1] Colorado Sch Mines, Dept Met & Mat Engn, 1500 Illinois St, Golden, CO 80401 - USA
[2] Univ Fed Sao Carlos, Dept Engn Mat, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[3] Univ Fed Fluminense, Escola Engn Ind Met Volta Redonda, Av Trabalhadores 420 Vila Santa Cecilia, 1R-27255125 Volta Redonda, RJ - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Alloys and Compounds; v. 727, p. 460-468, DEC 15 2017.
Web of Science Citations: 3
Abstract

The subtle change in the space group that occurs in the Al12-xMnxCe tau t phase as the Al/Mn ratio is varied in the Al-Mn-Ce system was characterized using scanning electron microscopy and analytical transmission electron microscopy and the atom positions associated with this change were refined using x-ray diffraction. In addition, the reaction temperatures were identified using differential scanning calorimetry. Understanding the nature of this phase is of particular importance because of its presence in a series of high strength, high temperature alloys that are being pursued in this system. It is shown that there are two distinct space groups for the t phase that are related to one another and depend on the Al/Mn ratio - at lower ratio, the space group is I4//mmm but at higher Al/Mn ratio, the Mn and Al atoms order on one of the Wyckoff sites in the I4/mmm structure and the ordering plus slight distortions away from the symmetry positions causes a loss of the body centering and a change to the P4/nmm space group with a unit cell approximately twice that of the I4/mmm cell. The results provide clarification to the conflicting reports in the literature and lead to a clearer assessment of the phase equilibria in the Al-rich portion of the Al-Mn-Ce system. (C) 2017 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 13/24530-9 - MECHANISM OF FORMATION OF QUASICRYSTALLINE PHASES IN ALUMINUM ALLOYS UNDER LOW COOLING RATES FROM THE LIQUID
Grantee:Francisco Gil Coury
Support Opportunities: Scholarships in Brazil - Master