Electrochemical Characterization of a Novel Mg70Al18Zn6Ca4Y2 Low Entropy Alloy in Different Aqueous Environments

Sudha, Priya; Tun, Khin Sandar; Nahata, Anchal; Gupta, Manoj; Vincent, S.

doi:10.1007/s11661-021-06247-z

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…The calculation formula of normalΔSnormalmix is as follows: Here R is the gas constant (8.314J·mol −1 ·K −1 ), and ci is the atomic percentage of the i-th component. Low-entropy alloys [18] are defined as normalΔSnormalmix less than R, normalΔSnormalmix between R and 1.5R is defined as medium-entropy alloys [19,20], and normalΔSnormalmix greater than 1.5R is defined as high-entropy alloys [21,22]. According to formula (1), the normalΔSnormalmix of REE0 alloy and three groups of AlCoCrFeNi 2.1 -based HEAs was 1.55R and 1.64R, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effects of rare earth elements on AlCoCrFeNi_2.1 eutectic high-entropy alloy

Nong

et al. 2023

Materials Science and Technology

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In order to explore the effect of rare earth elements (REEs) on the eutectic high-entropy alloys (EHEAs), 0.2 atomic per cent of Sc, Y, and La elements were added to the AlCoCrFeNi2.1(REE0) EHEA in this work. The phase composition, element distribution, electrochemical properties and mechanical properties of the alloys were analysed. The results showed that the AlCoCrFeNi2.1-based HEAs are still composed of Co, Cr, Fe (face-centred cubic)-rich phase and Al, Ni (face-centred cubic)-rich phase. After Sc, Y, La were added, Ni2Sc, Al2Y, Al2La and other intermetallics were formed in the AlCoCrFeNi2.1 alloy. In addition, it was proved that Y element can promote the formation of hexagonal close-packed (HCP) phase. AlCoCrFeNi2.1Y0.2(Y0.2) alloy has excellent corrosion resistance. AlCoCrFeNi2.1Sc0.2(Sc0.2) alloy has the best mechanical properties. HIGHLIGHTS With the addition of rare earth elements, the face-centred cubic phase and the B2 phase still exist in the alloy. In addition, there are intermetallics in the alloys. Combined with first-principles calculations, it was determined that the Laves phases in AlCoCrFeNi2.1Y0.2 alloy may be Al2Y, Al3Y or AlY. The Laves phase in the AlCoCrFeNi2.1La0.2 alloy may be Al2La, Al3La or LaNi5. The addition of Y element can promote the formation of HCP phase in AlCoCrFeNi2.1 alloy. The generated HCP phase occupies the position of the original B2 phase. Y element can also improve corrosion resistance. The Vickers hardness of AlCoCrFeNi2.1Sc0.2 alloy is 20% higher than that of AlCoCrFeNi2.1 alloy, while the compressive strength of 1897 MPa and the compressive deformation of 26% are retained.

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Section: Resultsmentioning

confidence: 99%

Effects of rare earth elements on AlCoCrFeNi_2.1 eutectic high-entropy alloy

Nong

et al. 2023

Materials Science and Technology

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“…Subsequently, a suitable equivalent circuit was selected to fit the best curve. Detailed experimental procedures are elaborated elsewhere [ 42 ].…”

Section: Methodsmentioning

confidence: 99%

Biocorrosion and Cytotoxicity Studies on Biodegradable Mg-Based Multicomponent Alloys

Sudha,

Tun,

Pillai

et al. 2024

Bioengineering

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Magnesium-based multicomponent alloys with different compositions, namely Mg60Al20Zn5Cu10Mn5 (Mg60 alloy), Mg70Al15Zn5Cu5Mn5 (Mg70 alloy), and Mg80Al5Cu5Mn5Zn5 (Mg 80) alloys, were prepared using the disintegrated melt deposition technique. The DMD technique is a distinctive method that merges the benefits from gravity die casting and spray forming. This approach facilitates high solidification rates, process yields, and reduced metal wastage, resulting in materials with a fine microstructure and minimal porosity. Their potential as biodegradable materials was assessed through corrosion in different simulated body fluids (SBFs), microstructure, and cytotoxicity tests. It was observed that the Mg60 alloy exhibited low corrosion rates (~× 10−5 mm/year) in all SBF solutions, with a minor amount of corrosive products, and cracks were observed. This can be attributed to the formation of the Mg32(AlZn)49 phase and to its stability due to Mg(OH)2 film, leading to excellent corrosion resistance when compared to the Mg70 and M80 alloys. Conversely, the Mg80 alloy exhibited high corrosion rates, along with more surface degradation and cracks, due to active intermetallic phases, such as Al6Mn, Al2CuMg, and Al2Cu phases. The order of corrosion resistance for the Mg alloy was found to be ASS > HBSS > ABP > PBS. Further, in vitro cytotoxicity studies were carried out using MDA-MB-231 tumor cells. By comparing all three alloys, in terms of proliferation and vitality, the Mg80 alloy emerged as a promising material for implants, with potential antitumor activity.

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“…Once the analysis was done, for fitting, impedance spectra were converted into an equivalent circuit by using EC‐Lab software. [ 23,24 ]…”

Section: Methodsmentioning

confidence: 99%

“…Once the analysis was done, for fitting, impedance spectra were converted into an equivalent circuit by using EC-Lab software. [23,24] 2.4 | Scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) analysis SEM (Model: JEOL JSM-6010) equipped with EDS was used to understand the surface morphologies and chemical composition of the Al 75 Mg 5 Li 10 Zn 5 Cu 5 alloy after PDP and EIS measurements.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Electrochemical characterization of a novel multicomponent Al₇₅Mg₅Li₁₀Zn₅Cu₅ low entropy alloy in different pH environments

Sudha

Tun

Gupta

et al. 2022

Materials & Corrosion

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The corrosion behavior and microstructure of a novel multicomponent Al 75 Mg 5 Li 10 Zn 5 Cu 5 low entropy alloy (Al LEA) were investigated in different Cl − ion concentrations of acidic (HCl), neutral (NaCl), and alkaline (NaOH) media. The study was performed by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The surface morphologies and chemical composition were examined by using a scanning electron microscope with energy-dispersive X-ray spectroscopy. The results indicated that with the increase of the Cl − ion concentrations, the degradation rate with more pits and cracks was observed in both acidic and neutral media. This is due to the breakdown of Al(OH) 3 /Al 2 O 3 passive layer. In an alkaline medium, increasing of pH value from pH 8 to pH 12, there was a slight increment in corrosion rate (CR). However, the corrosion trend was not witnessed on alloy surfaces because of the formation of Mg 32 (Al, Zn) 49 and AlCu phases, which are more stable than α-Al. The order of Al-LEA CR is found to be HCl > NaCl > NaOH. The results obtained from the polarization and EIS were in good agreement with each other.

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Electrochemical Characterization of a Novel Mg70Al18Zn6Ca4Y2 Low Entropy Alloy in Different Aqueous Environments

Cited by 8 publications

References 32 publications

Effects of rare earth elements on AlCoCrFeNi_2.1 eutectic high-entropy alloy

Effects of rare earth elements on AlCoCrFeNi_2.1 eutectic high-entropy alloy

Biocorrosion and Cytotoxicity Studies on Biodegradable Mg-Based Multicomponent Alloys

Electrochemical characterization of a novel multicomponent Al₇₅Mg₅Li₁₀Zn₅Cu₅ low entropy alloy in different pH environments

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Electrochemical Characterization of a Novel Mg70Al18Zn6Ca4Y2 Low Entropy Alloy in Different Aqueous Environments

Cited by 8 publications

References 32 publications

Effects of rare earth elements on AlCoCrFeNi2.1 eutectic high-entropy alloy

Effects of rare earth elements on AlCoCrFeNi2.1 eutectic high-entropy alloy

Biocorrosion and Cytotoxicity Studies on Biodegradable Mg-Based Multicomponent Alloys

Electrochemical characterization of a novel multicomponent Al75Mg5Li10Zn5Cu5 low entropy alloy in different pH environments

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Effects of rare earth elements on AlCoCrFeNi_2.1 eutectic high-entropy alloy

Effects of rare earth elements on AlCoCrFeNi_2.1 eutectic high-entropy alloy

Electrochemical characterization of a novel multicomponent Al₇₅Mg₅Li₁₀Zn₅Cu₅ low entropy alloy in different pH environments