Microstructure and fatigue behavior of cold spray coated Al5052

Ghelichi, R.; MacDonald, Daniel W.; Bagherifard, Sara; Jahed, Hamid; Guagliano, Mario; Jodoin, B.

doi:10.1016/j.actamat.2012.08.020

Cited by 130 publications

(58 citation statements)

References 17 publications

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“…The probability of development of sub-surface cracks in cast AZ31B which rupture at lower stresses is removed in CS samples as any premature cracks in the cast AZ31B were showed not to be progressive cracks. The higher impact velocity and temperature of the carrier gas of CS powder on the substrate induced severe plastic deformation resulting in adiabatic shear instability as discussed earlier [14,25,27]. Further, the thermal expansion coefficient (TEC) between coating (AA7075) and substrate (AZ31B) significantly influences the residual stress formation.…”

Section: Behavior Of Coating On Cyclic Loadingmentioning

confidence: 99%

“…When AA comes in contact with air a thin aluminum oxide layer is made which protects the substrate from penetration of the oxygen which in turn results better oxidation resistance. A number of research work has been reported on the surface modification of Mg alloy substrate in CS process using AA as coating materials [12][13][14][15][16][17][18]. Tao et al [20,21] investigated the corrosion behaviour of AZ91D Mg alloy and concluded that the main cause for Mg shortening is its corrosion fatigue life.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, Mg alloys are susceptible to form oxides, chlorides, and sulfides when in the harsh environment which limits its extensive applications. Studies reported that the fatigue and corrosion properties of Mg alloys can be improved by surface modification in CS method [12][13][14][15][16][17][18] by employing different coating materials, which has higher strength and better corrosion resistance. Aluminum and its alloys (AA) have shown to be an excellent coating material for coating the surface of the Mg alloy parts [19].…”

Section: Introductionmentioning

confidence: 99%

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Fatigue life enhancement of cast Mg alloy by surface modification in cold spray process

2018

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Abstract. To improve the fatigue life of Mg alloy, high strength AA7075 spherical powder was deposited on AZ31B samples in nitrogen carrier gas environment at 400°C temperature in cold spray process followed by electrostatic painting with zinc phosphate. The fully reverse four-point rotating-bending fatigue tests were conducted on the coated and uncoated samples in different environmental conditions. It is seen that the cold sprayed AA7075 improved the yield strength of the AZ31B cast alloy. Similarly, a significant fatigue enchantment was observed in the coated samples, reaching a fatigue strength of 90 MPa compared to as-cast fatigue strength of 70 MPa at 10 7 cycles when tested in air, and fatigue strength of 80 MPa under a 3.5%NaCl testing environment. The SEM analysis at the interface of the tensile tested sample exhibited the interfacial fracture followed by delamination of the coating. Similarly, delamination of coating was merely detected in the fatigue fracture sample tested in the air, while the sample tested in the corrosive environment showed pits which allowed the solution to penetrate in the AZ31B substrate results delamination and premature failure. However, the presence of e-paint forms a passive layer which is hindering the pit formation and extending the fatigue life.

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Section: Behavior Of Coating On Cyclic Loadingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fatigue life enhancement of cast Mg alloy by surface modification in cold spray process

2018

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“…Results of the present work conclude the opposite in regards to the fatigue limit after coating. Ziemian [27] and Ghelichi [28], with their co-workers, found that the fatigue behaviour of coated alloys depends on the coating properties and the coating deposition parameters. Although the factors that are responsible for the increased fatigue limit after cold spray are unclear, it is believed that the higher yield strength, work hardening at interface and higher bonding strength of the Al/Al 2 O 3 composite coatings in the present work play a dominant role in increasing fatigue resistance.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

The effect of cold sprayed coatings on the mechanical properties of AZ91D magnesium alloys

Xiong

Zhang

2014

Surface and Coatings Technology

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Although many previous studies have confirmed that cold sprayed Al+xAl 2 O 3 (x=0-75vol.%) composite coatings on magnesium alloys can effectively improve wear and corrosion resistance, the effect of such coatings on tensile and fatigue properties is still unclear. The present work aims to evaluate the tensile properties and fatigue resistance of an AZ91D alloy with cold sprayed Al+xAl 2 O 3 (x=0, 30, 50vol.%) coatings. The experimental results showed that although the cold spray coating leads to an increase in yield strength and fatigue limit, the tensile strength is reduced. In-situ examination of the macro-morphology of surfaces of the coated specimens during tensile testing was carried out through video recording. It indicated that once the tensile specimens have yielded, horizontal cracks that were perpendicular to the tensile axis formed on the surface of the specimens. Fractographic analysis of the fracture surfaces of the tensile specimens in a scanning electron microscope revealed that all the cracks within the cold sprayed coatings were suspended at the coating/substrate interface. Based on these experimental observations, it is considered that the improved yield strength is attributed to the constraint effect of the cold sprayed composite coatings on the magnesium substrate. The enhanced fatigue limit is a result of the higher yield strength and the coating/substrate interface barrier to crack propagation. The decrease in tensile strength is attributed to the brittle fracture of the cold sprayed coatings when yielding of the specimens.

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“…9,17,18 Thus, it is difficult or impossible to engineer a nanoscale surface using these manufacturing techniques. However, an NPDS has non-invasive deposition characteristics, as demonstrated by observing cross-sections with scanning electron microscopy, 19 which shows no damage on the polymer surface.…”

Section: Nanoscale Damagementioning

confidence: 99%

Nanoscale patterning and welding by solvent-free dry particle spray and focused ion beam

Choi

Kim

2014

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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Nano particle deposition system (NPDS) is one of dry particle spray methods such as cold spray and aerosol deposition. It can be used to build structures from metals, ceramics, and nanomaterials without any solvents at room temperature and under low vacuum conditions, reducing energy consumption. Recent advances in dry particle spray techniques, including NPDS, have demonstrated their use with advanced nanomaterials such as carbon nanotube. However, to date, this process has not been successfully scaled down to 100-nm scales. Here, we demonstrate the use of NPDS as dry particle spray method in the nanoscale regime with the help of a focused ion beam for nanoscale manufacturing. Nanoscale patterning and welding were achieved using a nano particle deposition system with miniaturized feature sizes that were smaller than 100 nm in scale.

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Microstructure and fatigue behavior of cold spray coated Al5052

Cited by 130 publications

References 17 publications

Fatigue life enhancement of cast Mg alloy by surface modification in cold spray process

Fatigue life enhancement of cast Mg alloy by surface modification in cold spray process

The effect of cold sprayed coatings on the mechanical properties of AZ91D magnesium alloys

Nanoscale patterning and welding by solvent-free dry particle spray and focused ion beam

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