Microstructure and mechanical properties of cold sprayed 7075 deposition during non-isothermal annealing

Rokni, Masoud; Widener, Christian; Champagne, Victor K.; Crawford, Grant A.

doi:10.1016/j.surfcoat.2015.07.016

Cited by 68 publications

(10 citation statements)

References 63 publications

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“…Rokni et al [62] were able to measure the microhardness on the first layer of sprayed powder and the coating after multiple passes. They found out that the first layer showed microhardness of 1.26 ± 0.18 GPa, approximately the hardness of 7075 Al powder [125] while the metal layers subsequently deposited showed higher hardness values (1.5-1.8 GPa). The hardness of the bonding layer is indicative of a low degree of plastic deformation (work hardening) in this region and indicates the absence of peening [126,127], attributed to more particle deformation resulting from metal/metal particle interactions in the build-up layers of the deposit.…”

Section: Properties Of the Coatings Microhardnessmentioning

confidence: 99%

Cold spray deposition of metallic coatings on polymers: a review

et al. 2021

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Cold spray deposition, which can be framed in the wider family of additive manufacturing, is a manufacturing technique that is able to produce coatings on diverse types of substrates through the deposition of feedstock powder. As a low-temperature process, cold spray represents a potential solution for the metallization of temperature-sensitive materials, i.e. polymers and polymer matrix composites. The study of the cold spray technology for the metallization of polymers is still in its early stage, and the deposition mechanisms of metals on polymer-based materials are not thoroughly understood yet. On these premises, a review on this topic is needed to systematically depict the actual state of the art and to provide a reliable and well-organized overview discussing all the theories arisen in these years. In summary, this review aims: i) to collect all the available literature and enucleate the most discussed and interesting points (the most prevailing theories regarding the bonding mechanisms, the influence of the different process parameters and the main characteristics of cold-sprayed coating), providing a reliable and well-organized state of the art; ii) to define the open questions and to delineate the directions of future work.

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Section: Properties Of the Coatings Microhardnessmentioning

confidence: 99%

Cold spray deposition of metallic coatings on polymers: a review

et al. 2021

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“…"Significant improvement in both the tensile strength and elongation of the CS 316L stainless steel was achieved by vacuum annealing treatment due to the absence of the oxide inclusions and a considerably enhanced bonding strength at the inter-particle interfaces [29]. Moreover, heat treatment (solution and aging treatment) was applied to improve the mechanical properties of CS Al alloys, such as 6061Al [31] and 7075Al [32,33]." 4.…”

Section: Dear Editormentioning

confidence: 99%

Effect of annealing treatment on microstructure and mechanical properties of cold sprayed TiB2/AlSi10Mg composites

Xie

Chen

et al. 2021

Surfaces and Interfaces

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“…The representative microstructures were etched, showing where prior particle boundaries exist. Upon inspection, interparticle voids and porosity can be observed; lower particle-impact velocity and subsequent lack of local deformation in some particles results in these types of imperfections forming in cold spray deposits [32][33][34]. Rokni et al [24] observed similar microstructure in their as-deposited cold-sprayed Al 6061 materials and found the imperfections to influence the mechanical properties.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Stress Corrosion Cracking Resistance of Cold-Sprayed Al 6061 Deposits Using a Newly Developed Test Fixture

et al. 2019

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The stress corrosion cracking (SCC) response of Al 6061 bulk deposits produced by high-pressure cold spray (HPCS) was investigated and compared to commercial wrought Al 6061-T6 material. Representative tensile coupons were stressed to 25%, 65% and 85% of their respective yield strength and exposed to ASTM B117 salt fog for 90 days. After exposure, the samples were mechanically tested to failure, and subsequently investigated for stress corrosion cracking via optical and scanning electron microscopy with energy-dispersive X-ray spectroscopy (EDS). The results were compared to the wrought Al 6061-T6 properties and correlated with the observed microstructures. Wrought samples showed the initiation of stress corrosion cracking, while the cold-sprayed deposits appeared to be unaffected or affected by general corrosion only. Optical microscopy revealed evidence of stress corrosion cracking in the form of intergranular corrosion in the wrought samples, while no significant corrosion was observed in the cold-sprayed deposits. Fractography revealed wrought samples failed due to multiple mechanisms, with predominant cleavage and intergranular failure, but cold-sprayed samples only failed by ductile dimple rupture. The difference in SCC response between the differently processed materials is attributed to the documented benefits of the cold spray process, which includes maintaining fine grain structure of the feedstock powder and high density after consolidation, low oxidation, and work hardening effect.the strength required. The cold spray process can also produce near-net shapes before machining to final components, making it a possible method for three-dimensional (3D) manufacturing. Unlike thermal spray methods or conventional manufacturing processes, the main advantages of using cold spray is that it can produce coatings and bulk materials with no recrystallization, thus maintaining the structure and size of starting powders. As a low-temperature process, it operates below the melting point of metals and results in very low porosity deposits without the need for combustible gasses. Additional motivation to use this process is the low oxide content, which can improve corrosion resistance, mechanical properties, and wear resistance by eliminating sites for localized corrosion and premature failure.There has been a great deal of research into corrosion mechanisms in metallic materials over the past century [5][6][7][8][9][10][11][12][13][14][15][16][17]. Atmospheric or environmentally assisted corrosion is one of the least understood areas of corrosion. Stress corrosion cracking is a type of atmospheric corrosion that is very difficult to detect and mitigate, since it only occurs in alloys that have been under stress in corrosive environments. Metallic materials used extensively in engineering and defense applications are susceptible to corrosion. Corrosion costs the US billions of dollars per year in preventative maintenance and product loss. There are many different types of corrosion that can attack metallic materials,...

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Microstructure and mechanical properties of cold sprayed 7075 deposition during non-isothermal annealing

Cited by 68 publications

References 63 publications

Cold spray deposition of metallic coatings on polymers: a review

Cold spray deposition of metallic coatings on polymers: a review

Effect of annealing treatment on microstructure and mechanical properties of cold sprayed TiB2/AlSi10Mg composites

Stress Corrosion Cracking Resistance of Cold-Sprayed Al 6061 Deposits Using a Newly Developed Test Fixture

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