Gürbüz, Rıza
The fatigue crack growth behaviour of 7050 T73651 high strength aluminium alloy that was originally developed for the aircraft industry was investigated in this study. The tests were conducted by using C-T specimens machined in six orientations under the action of constant amplitude sinusoidal load cycles. The tests were first carried out in laboratory air and then repeated in salt-water fog of a 5% NaCl solution to observe the effect of the environment on the fatigue crack growth behaviour. The experimental results showed that the fatigue life, maximum stress intensity range and the fatigue crack growth rate of the specimens were seriously affected by the environment. The severity of the effect, on the other hand, was observed to be dependent on the orientation. The strongest orientation was determined to be L-S, while the weakest was S-L.


Effects of SiC particulates on the fatigue behaviour of an Al-alloy matrix composite
Kaynak, Cevdet (2006-01-01)
In this study, the fatigue behaviour of aluminium matrix-silicon carbide (SiC) particulate reinforced composite specimens was investigated in comparison to the matrix aluminium alloy containing 12 wt% Si. Three different weight percentages of SiC particulates: 5, 10, and 15 in the size range of 40-60 gm were injected into the melt. Mg was also added to improve the wettability of Al-alloy matrix over SiC particulates resulting in better interfacial bonding. Test specimens were machined from squeeze casting b...
Effect of stress ratio on the rate of growth of fatigue cracks in 1100 Al-alloy
Bilir, Ömer.G.; Harun, Metin (Elsevier BV, 1990-1)
Axial load fatigue crack propagation tests were conducted on notched sheet specimens made of 1100 aluminum alloy. These tests were made at stress ratios (ratio of the minimum stress to the maximum stress) ranging from −0.5 to 0.5 in order to study the effects of stress ratio on fatigue crack growth. Experimental fatigue crack propagation data were analysed using Paris-Erdoǧan stress intensity analysis. The data from the tests at different stress ratios showed that two regions, namely, region I and region I...
Effect of retrogression and reaging heat treatment on corrosion fatigue crack growth behavior of AA7050 alloy
Akgün, Nevzat; Gürbüz, Rıza; Department of Metallurgical and Materials Engineering (2004)
The effect of retrogression and reaging heat treatment on corrosion fatigue crack growth behavior on AA7050 T73651 aluminum alloy is investigated. CT (Compact Tension) specimens are prepared in LS direction for fatigue crack growth tests . Samples are solution heat treated at 477 °C and aged at 120 °C for 24 h (T6 condition). After that, samples are retrogressed at 200 °C for times of 1, 5, 30, 55 and 80 minutes in a circulating oil bath. Then, samples are re-aged at 120 °C for 24 h (T6 condition). Hardness...
Effect of TiH2 particle size on foaming of aluminium
Kubilay, Ceylan; Öztürk, Tayfur; Department of Metallurgical and Materials Engineering (2005)
A study is carried out on the production of aluminum foams via powder processing. The study deals mainly with the effect of TiH2 particle size on the process of foaming. Mainly two TiH2 particle sizes were used; namely 27,5 ?m and 8,5 ?m. Foaming experiments were carried out at temperatures between 675oC ا 840oC. The viscosity of the system is adjusted by controlled addition of Al2O3. The study shows that choice of foaming agent size is influential in the foaming process. With the use of fine foaming agent,...
Effect of hydrogen on fatigue behavior of a cadmium coated high strength steel
Güleken, Ümran Başak.; Gürbüz, Rıza; Department of Metallurgical and Materials Engineering (2019)
C Despite the associated health and safety concerns of Cadmium, this material remains the most commonly used fastener plating material in aerospace applications. The plating operation is done by a well understood and common electrodeposition process. If a cadmium plated part has high strength (1000 MPa and above) then in order to prevent hydrogen embrittlement it must be baked at 191°C for 23 hours, within 2 hours after plating. Yet it has been seen that parts fail due to hydrogen embrittlement during servi...
Citation Formats
R. Gürbüz and W. SCHUTZ, “EFFECT OF SALT-WATER FOG ON FATIGUE CRACK-GROWTH BEHAVIOR OF 7050-ALUMINUM ALLOY IN DIFFERENT ORIENTATIONS,” JOURNAL OF MATERIALS SCIENCE, pp. 1032–1038, 1991, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47879.