Effect of Localized Corrosion on Fatigue-Crack Growth in 2524-T3 and 2198-T851 Aluminum Alloys Used as Aircraft Materials

被引：30
|
作者：
Moreto, J. A. [1 ,2 ]
Broday, E. E. [3 ]
Rossino, L. S. [4 ,5 ]
Fernandes, J. C. S. [6 ,7 ]
Bose Filho, W. W. [8 ]
机构：
[1] Univ Fed Triangulo Mineiro, Inst Exact Sci Nat & Educ, Ave Doutor Randolfo Borges Jr, BR-38064200 Uberaba, MG, Brazil
[2] Univ Sao Paulo, Dept Mat Engn, Ave Trabalhador Sao Carlense, BR-13566590 Sao Carlos, SP, Brazil
[3] Fed Univ Technol Parana UTFPR, Dept Prod Engn, Ave Monteiro Lobato S-N Km 04, BR-84016210 Ponta Grossa, PR, Brazil
[4] Sorocaba Technol Coll FATEC, Ave Engenheiro Carlos Reinaldo Mendes, BR-18013280 Sao Paulo, Brazil
[5] Fed Univ Sao Carlos UFSCar, Rodovia Joao Leme dos Santos Km 110, BR-18052780 Sorocaba, SP, Brazil
[6] Univ Lisbon, Inst Super Tecn, Dept Chem Engn, P-1049001 Lisbon, Portugal
[7] CQE, P-1049001 Lisbon, Portugal
[8] Univ Sao Paulo, Dept Mat Engn, Ave Trabalhador Saocarlense, BR-13566590 Sao Carlos, SP, Brazil
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2018年 / 27卷 / 04期
关键词：
Al alloys; corrosion-fatigue; seawater fog environment; 2XXX series Al alloys; AL; BEHAVIOR; PROPAGATION; INITIATION;
D O I：
10.1007/s11665-018-3244-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Corrosion and fatigue of aluminum alloys are major issues for the in-service life assessment of aircraft structures and for the management of aging air fleets. The aim of this work was to evaluate the effect of localized corrosion on fatigue crack growth (FCG) resistance of the AA2198-T851 Al-Li alloy (Solution Heat Treated, Cold Worked, and Artificially Aged), comparing it with the FCG resistance of AA2524-T3 (Solution Heat Treated and Cold Worked), considering the effect of seawater fog environment. Before fatigue tests, the corrosion behavior of 2198-T851 and 2524-T3 aluminum alloys was verified using open circuit potential and potentiodynamic polarization techniques. Fatigue in air and corrosion fatigue tests were performed applying a stress ratio (R) of 0.1, 15 Hz (air) and 0.1 Hz (seawater fog) frequencies, using a sinusoidal waveform in all cases. The results showed that the localized characteristics of the 2198-T851 and 2524-T3 aluminum alloys are essentially related to the existence of intermetallic compounds, which, due to their different nature, may be cathodic or anodic in relation to the aluminum matrix. The corrosive medium has affected the FCG rate of both aluminum alloys, in a quite similar way.
引用
收藏
页码：1917 / 1926
页数：10
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