Effects of chromic acid anodizing on fatigue behavior of 7050 T7451 aluminum alloy

Date

2021-09-01

Author

Ilhan, Cagri
Gürbüz, Rıza

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

217
views

0
downloads

The effect of chromic acid anodizing (CAA) surface treatment on 7050 T7451 aluminum alloy was presented in this study in terms of fatigue behavior. CAA is a treatment against corrosion by producing aluminum oxide layer (Al2O3) at the surface. However, fatigue performance of 7050 T7451 is affected by the coating. In this study, eight different CAA processes were examined with regard to etching stage of pre-treatments by using an alkaline etchant and/or acid etchants with various immersion times. Optical microscopic examinations were applied in order to determine pitting characteristics for the selection of CAA process parameters before fatigue tests. A CAA process was selected among eight processes in terms of pitting characteristics in order to apply fatigue specimens. Four fatigue test groups were determined to investigate bare condition of 7050 T7451 and sub-stages of the CAA particularly. Constant amplitude axial fatigue tests were conducted on specimens at 91 Hz at stress ratio (R) -1 until run-out criteria, which was 106 cycles. Fatigue life reduction was determined due to pretreatments of CAA. Fracture surfaces of the specimens were examined by scanning electron microscope (SEM) to investigate morphology and crack initiation sites.

URI

https://hdl.handle.net/11511/92645

Journal

MATERIALS TESTING

DOI

https://doi.org/10.1515/mt-2021-0003

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

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 BUILD DIRECTION ON CRACK GROWTH BEHAVIOR OF Ti6Al4V ALLOY MANUFACTURED BY ELECTRON BEAM MELTING Çalık, Feyziye; Gürbüz, Rıza; Department of Metallurgical and Materials Engineering (2022-12-01) The effects of build orientation on the crack propagation behavior of Ti6Al4V fabricated by elecron beam melting which is one of metal additive manufacturing methods were examined in this study. Firstly, Ti6Al4V blocks were manufactured at different building angles (00,300,450and 900) regarding as base plane using EBM. Subsequently, test specimens were machined from these blocks in compliance with ASTM E8, ASTM E399 and ASTM E647 standards for tensile, fracture toughness and crack growth rate specimen...
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 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 post-processing heat treatment on the mechanical properties of inconel 718 fabricated by selective laser melting Özer, Seren; Dericioğlu, Arcan Fehmi; Department of Metallurgical and Materials Engineering (2020) In this study, effect of the building direction and post-processing heat treatments on the microstructure and high temperature mechanical properties of as-fabricatedInconel 718 alloys have been investigated. Inconel 718 samples were fabricated in two different building directions such that their longitudinalaxes wereeither parallel (horizontally built) or perpendicular (vertically built) to the building plate. During the selective laser melting (SLM)process, some undesired features can...

Citation Formats

C. Ilhan and R. Gürbüz, “Effects of chromic acid anodizing on fatigue behavior of 7050 T7451 aluminum alloy,” MATERIALS TESTING, vol. 63, no. 9, pp. 805–810, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/92645.