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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.)

Effects of cobalt and solidification cooling rate on intermetallic phases and tensile properties of a -Cu, -Zn, -Fe containing Al-Si alloy

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Author(s):
Xavier, Marcella G. C. [1] ; Souza, Thaisa M. G. [2] ; Cheung, Noe [3] ; Garcia, Amauri [3] ; Spinelli, Jose E. [4]
Total Authors: 5
Affiliation:
[1] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, BR-13565905 Sao Carlos, SP - Brazil
[2] Fed Univ Santa Catarina UFSC, Dept Mat Engn, BR-89036256 Blumenau, SC - Brazil
[3] Univ Estadual Campinas, UNICAMP, Dept Mfg & Mat Engn, BR-13083860 Campinas, SP - Brazil
[4] Fed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY; v. 107, n. 1-2, p. 717-730, MAR 2020.
Web of Science Citations: 0
Abstract

Tensile properties of recycled Al-Si alloys are reduced in the presence of high iron (Fe) content. Until nowadays, the addition of manganese (Mn) is the only way permitting to transform the deleterious beta-Al5FeSi phase. Alternatively, for the first time, the effects of cobalt (Co) and solidification cooling rate on the neutralization of the beta-Al5FeSi phase are reported. The Al5FeSi phase changes into the Al-5(Fe,Co)Si phase. In the present study, recycled Al-7 wt%Si alloys are investigated. Their compositions were established guided by some typical scrap compositions (in wt%) having small impurities such as iron (0.6% Fe), zinc (0.25% Zn), and copper (0.35% Cu). The attempt is made in order to enhance the mechanical strength of the Al-7%Si-0.6%Fe-0.35%Cu-0.25%Zn alloy by means of modification with Co. Two directionally solidified (DS) alloy castings are generated, which are the Al-7%Si-0.6%Fe-0.35%Cu-0.25%Zn and Al-7%Si-0.6%Fe-0.35%Cu-0.25%Zn-0.5%Co alloys, in which samples solidified at different cooling rates have been generated. Tensile strength and ductility are reported for both tested alloys and their respective samples. The strength increases owing to the addition of Co, which is promising if small alloying scraps are considered in the production of Fe-rich Al-Si alloys. The presence of Co induces mechanical strengthening by the formation of higher fractions of intermetallics. The ductility, however, showed some loss with almost 25% of decrease caused by Co. (AU)

FAPESP's process: 17/12741-6 - Application of experimental solidification techniques, characterization of microstructure and properties in the evaluation of eutectic and hypereutectic Al-base and Zn-base alloys
Grantee:José Eduardo Spinelli
Support Opportunities: Regular Research Grants