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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.)

Exfoliation corrosion susceptibility in the zones of friction stir welded AA2098-T351

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Author(s):
Milagre, Mariana X. [1] ; Donatua, Uyime [1] ; Machado, Caruline S. C. [1] ; Araujo, Joao Victor S. [1] ; Ferreira, Raphael O. [2] ; Silva, Rejane Maria P. [1] ; Antunes, Renato A. [3] ; Costa, Isolda [1]
Total Authors: 8
Affiliation:
[1] Inst Pesquisas Energet Nucl IPEN CNEN, Ave Prof Lineu Prestes 2242, Sao Paulo, SP - Brazil
[2] Escola Politecn Univ Sao Paulo, PMR USP, Ave Prof Mello Moraes 2463, Sao Paulo, SP - Brazil
[3] Univ Fed ABC, Ctr Engn Modelagem & Ciencias Sociais Aplicadas, Ave Estados 5001, Santo Andre, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 8, n. 6, p. 5916-5929, NOV-DEC 2019.
Web of Science Citations: 1
Abstract

In the present study, the exfoliation susceptibility of the weld zones in friction stir welded AA2098-T351 was compared with that of the base metal (BM) according to ASTM G34 standard practice. Friction stir welding (FSW) had a significant effect on the microstructure of the Al alloy tested and the susceptibility to exfoliation was strongly affected by the microstructure. Different features of corrosion attack and exfoliation susceptibility were observed when the zones affected by FSW were tested isolated or coupled. Also, the near-surface deformed layer had an important effect on the Al alloy susceptibility to exfoliation. These are the main findings of this work. The corrosion features were correlated with the microstructural modifications related to the welding process and with the electrochemical response. The T1 phase morphology, distribution and size were critical for exfoliation susceptibility. The stir zone (SZ) was the zone most resistant to exfoliation. However, resistance to exfoliation varied with the temperatures reached in the heat affected zones (HAZs). The HAZ exposed to the lowest temperatures during welding, HAZ (LT), was the most susceptible to exfoliation, whereas the HAZ exposed to the highest temperatures, HAZ (HT), presented high resistance to exfoliation, similarly to the SZ. The ASTM-G34 practice was an effective and useful method in identifying the different exfoliation resistances of the BM and the various zones affected by FSW. The results of this practice were supported by electrochemical impedance spectroscopy (EIS) tests. (C) 2019 The Authors. Published by Elsevier B.V. (AU)

FAPESP's process: 13/13235-6 - Investigation on the localized corrosion and the fatigue corrosion resistance of high strength aluminum alloys joined by friction stir welding (FSW)
Grantee:Isolda Costa
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 18/06880-6 - Use of Localized Electrochemical Techniques for the Study of Corrosion of of High Strength Aluminum Alloys Joined by Friction (FSW).
Grantee:Rejane Maria Pereira da Silva
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 17/03095-3 - Investigation on corrosion susceptibility of Al-Cu-Li alloys by friction stir welding (FSW) through scanning vibrating electrode technique (SVET)
Grantee:Uyime Donatus
Support Opportunities: Scholarships in Brazil - Post-Doctoral