Influence of Silver nanoparticles addition on the phase transformation, mechanical properties and corrosion behaviour of Cu–Al–Ni shape memory alloys

Saud, S. N.; Hamzah, Esah; Abubakar, T.; Bakhsheshi‐Rad, Hamid Reza; Farahany, Saeed; Abdolahi, Ahmad; Taheri, Mahdi

doi:10.1016/j.jallcom.2014.05.173

Cited by 67 publications

(23 citation statements)

References 39 publications

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“…In general, the presence of Cu, Al, and Fe can be seen, which are the most important elements of the coating, with Zn from the substrate and Na and Cl from the corrosive electrolyte. The presence of these elements makes it possible to conclude that after the electrochemical tests, a coating of thin salt crystals and corrosion products with cuprous chloride (CuCl) was produced [26]. Figure 13 shows the Bode diagrams of Al-Cu coating applications at 1 h immersion time.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

“…Rpo is the resistance of the circuit to current flow through the pores, while Rsln represents the resistance of the electrolyte between the working electrode and the reference electrode, and Rct is the resistance to charge transfer. The time constant at higher frequencies in this circuit represents the dielectric pattern (CPEc and M) of the coating, and the time constant at lower frequencies represents the coating/substrate interface (CPEcd and N) properties [26]. The CPEs are a mathematical support that represents several elements of an electrical circuit.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

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The Corrosion Resistance of Aluminum–Bronze Coatings as a Function of Gas Pressure Used in the Thermal Spraying Process

2019

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We report the results of the influence of acetylene and oxygen gas pressure on the corrosion resistance of bronze-aluminum coatings deposited on a naval brass substrate by means of the thermal (flame) deposition process. The coatings were characterized by means of scanning electronic microscopy (SEM), energy-dispersive X-ray spectrometry (EDS), X-ray diffraction (XRD), X-ray fluorescence (XRF), and transmission electron microscopy (TEM). The corrosion tests were carried out via Tafel and electrochemical impedance spectroscopy (EIS). In addition, some samples were selected in order to investigate heat treatment and its effects on corrosion resistance. The results indicate that changes in the pressure and flow of the gas affects the composition, morphology, and physical properties of the coatings, and these effects have consequences for the behavior of the coatings when they are immersed in corrosion environments. The collision speed of the particles was identified as the most significant factor that influences the properties and the performance of the coating. The gas pressure modified the oxides and the porosity level, which improved the corrosion resistance.Coatings 2019, 9, 507 2 of 17 coatings in terms of adherence, mechanical properties, and corrosion resistance [2]. In order to optimize the results, the coatings have been deposited while changing the work distance and substrate roughness, and the effect of the pretreatment of the surface using different physical and chemical methods has been studied [3]. However, a combination of parameters relating to the combustion and gas projection pressure for producing better strength and good adhesion has not been found. Aluminum-bronze coatings have good wear and corrosion resistance properties because a copper oxide layer is formed on the surface. They are recommended for the protection and dimensional restoration of parts that are subject to harsh operating conditions [1].In the process of thermal projection by combustion, the chemical energy of combustible and combustion gases is used for the generation of the flame responsible for melting the projected particles. Oxyacetylene torches use a mixture of acetylene (C 2 H 2 ) and oxygen (O 2 ), which in a stoichiometric ratio produces a flame that reaches a temperature of up to 3386 K at 1 atmosphere of pressure [4]. An oxidant or highly oxidizing flame is when an excess of oxidizer is applied, and as a result, a primary reaction zone (cone of the flame) is obtained that is much longer than in a reductive flame or a stoichiometric flame. The particles stay longer in the hottest area of the flame, and therefore they can achieve better heating.The axial and radial temperature distribution and the changes in the velocity of the flame gases significantly affect the temperature of the particles and their behavior in flight, which influences the quality of the coating. The hot gases generated by combustion undergo complex events that involve heat and mass transfer phenomena in the boundary layers of the particle [5]. In ord...

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Section: Electrochemical Measurementsmentioning

confidence: 99%

Section: Electrochemical Measurementsmentioning

confidence: 99%

The Corrosion Resistance of Aluminum–Bronze Coatings as a Function of Gas Pressure Used in the Thermal Spraying Process

2019

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“…Since their discovery in the 1960s [1], Cu-based shape memory alloys (SMAs) have been widely used in engineering purposes due to their good thermal and electrical conductivity, moderate shape memory properties, and low cost of production in comparison with NiTi SMAs [2,3]. However, they represent poor strain recovery and formability as a result of brittleness in polycrystalline state, therefore, its practical application is limited [4][5][6][7]. Cu-Zn-Al and Cu-Al-Ni are the most commonly used alloys in Cu-based SMAs [8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and thermodynamic analysis of nanostructured Cu-13.2%Al-4%Ni ternary system synthesized by mechanical alloying

Mayahi

Shokuhfar

Vaezi

2019

Metall. Res. Technol.

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Thermodynamic analysis of nanostructured Cu-13.2%Al-4%Ni synthesized by mechanical alloying was studied through Miedema's semi-empirical model. The variations of lattice strain, crystallite size and microstructural evolution at various milling times were also measured using X-ray diffraction and scanning electron microscope. The results showed an increase in lattice strain and reduction in crystallite size due to an increase in density of structural defects as a result of high-energy collisions during mechanical alloying. The calculated thermodynamic data suggested that in all binary Cu-Al, Al-Ni and Ni-Cu systems, there is a driving force for solid solution formation over all compositions due to negative Gibbs free energy changes in those compositions, while this value is positive for the formation of amorphous phase over some compositions which can be attributed to the absence of driving force. Additionally, thermodynamic data were in agreement with XRD results which showed solid solution was formed at middle stages of mechanical alloying. Moreover, it is concluded that the formation of solid solution is easier at three corners of ternary diagram, where the concentration of one element is major, whilst amorphous phase formation is more desirable in other compositions.Keywords: thermodynamic properties / nanostructured materials / powder metallurgy / mechanical alloying / shape memory alloys *

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“…Cu-Al-Ni HTSMAs have been widely investigated due to its lower cost [3][4][5][6] in comparison with some well studied HTSMAs, such as Ti-Ni-Pd, TiTa and Ni-Mn-Ga [7][8][9][10][11][12][13][14][15], etc. However, polycrystalline Cu-Al-Ni alloys suffer from high brittleness, which is associated with large elastic anisotropy, intergranular cracking and large grain size [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…However, polycrystalline Cu-Al-Ni alloys suffer from high brittleness, which is associated with large elastic anisotropy, intergranular cracking and large grain size [16,17]. Some methods were adopted to improve the mechanical properties of polycrystalline Cu-Al-Ni, including grain refinement [18] and fourth element addition [3,[19][20][21]. Published results showed that rare earth Gd addition can tailor the microstructure and mechanical properties of shape memory alloys [22][23][24], and accordingly, Gd is added into Cu-13.0Al-4.0Ni HTSMA to improve its plastic in the present work.…”

Section: Introductionmentioning

confidence: 99%

Effects of Gd addition on the microstructure, mechanical properties and shape memory effect of polycrystalline Cu-Al-Ni shape memory alloy

et al. 2016

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Influence of Silver nanoparticles addition on the phase transformation, mechanical properties and corrosion behaviour of Cu–Al–Ni shape memory alloys

Cited by 67 publications

References 39 publications

The Corrosion Resistance of Aluminum–Bronze Coatings as a Function of Gas Pressure Used in the Thermal Spraying Process

The Corrosion Resistance of Aluminum–Bronze Coatings as a Function of Gas Pressure Used in the Thermal Spraying Process

Microstructure and thermodynamic analysis of nanostructured Cu-13.2%Al-4%Ni ternary system synthesized by mechanical alloying

Effects of Gd addition on the microstructure, mechanical properties and shape memory effect of polycrystalline Cu-Al-Ni shape memory alloy

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