Directionally solidified dilute Zn-Mg alloys: Correlation between microstructure and corrosion properties

Vida, Talita A.; Conde, A.; Freitas, Emmanuelle S.; Arenas, M.A.; Cheung, Noé; Brito, Crystopher; Damborenea, J. de; Garcia, Amauri

doi:10.1016/j.jallcom.2017.06.228

Cited by 17 publications

(17 citation statements)

References 24 publications

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“…The mold plates were polished to ensure the same contact surface with the solidified metal for both alloys. In this way, the procedures and analyses performed resemble and corroborate with the recent solidification studies found in the literature [27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionsupporting

confidence: 85%

Upward Unsteady-State Solidification of Dilute Al–Nb Alloys: Microstructure Characterization, Microhardness, Dynamic Modulus of Elasticity, Damping, and XRD Analyses

Coutinho

Silva

Sousa

et al. 2019

Metals

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Aluminium alloys form many important structural components, and the addition of alloying elements contributes to the improvement of properties and characteristics. The objective of this work is to study the influence of thermal variables on the microstructure, present phases, microhardness, dynamic modulus of elasticity, and damping frequency in unidirectional solidification experiments, which were performed in situ during the manufacturing of Al–0.8 Nb and Al–1.2 Nb (wt.%) alloys. Experimental laws for the primary (λ1) and secondary (λ2) dendritic spacings for each alloy were given as a function of thermal variables. For Al–0.8%wt Nb, λ1 = 600.1( T ˙ )−1.85 and λ2 = 186.1(VL)−3.62; and for Al–1.2%wt Nb, λ1 = 133.6( T ˙ )−1.85 and λ2 = 55.6(VL)−3.62. Moreover, experimental growth laws that correlate the dendritic spacings are proposed. An increase in dendritic spacing influences the solidification kinetics observed, indicating that metal/mold interface distance or an increase in Nb content lowers the liquidus isotherm velocity (VL) and the cooling rate (Ṫ). There is also a small increase in the microhardness, dynamic modulus of elasticity, and damping frequency in relation to the composition of the alloy and the microstructure.

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Section: Introductionsupporting

confidence: 85%

Upward Unsteady-State Solidification of Dilute Al–Nb Alloys: Microstructure Characterization, Microhardness, Dynamic Modulus of Elasticity, Damping, and XRD Analyses

Coutinho

Silva

Sousa

et al. 2019

Metals

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“…Development of binary Zn alloys continued with notable works by Zheng and co-workers [87,88] on Zn-Mg, as well as zinc-calcium (Zn-Ca), and zincstrontium (Zn-Sr) alloys. Other reports on Zn-Mg include those by Kubasek et al [55,89,90], Yao et al [91],Gong et al [92], Murni et al [93], Shen et al [94], Galib and Sharif [95], Mostaed et al [96], Jablonska et al [97], Dambatta et al [98,99], Vida et al [100], Jarzebska et al [101], Jin et al [102], Xiao et al [103], Alves et al [104], Wang et al [105], and Yang et al [78]. The range of Mg addition typically ranged from 1 to 3 wt%; though relatively high (>5%) [90] and low (<0.1 wt%) [102,103] alloy additions of Mg have also been reported.…”

Section: Binary Alloysmentioning

confidence: 99%

“…Vida et al [100] used an advanced solidification technique called directional solidification casting to create cast Zn with some interesting microstructures. The process is a modification on traditional casting and uses a water-cooled mold that was designed to promote directional solidification by controlling heat flow conditions.…”

Section: Advanced Processing Techniquesmentioning

confidence: 99%

The influence of alloying and fabrication techniques on the mechanical properties, biodegradability and biocompatibility of zinc: A comprehensive review

2019

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Zinc has been identified as one of the most promising biodegradable metals along with magnesium and iron. Zinc appears to address some of the core engineering problems associated with magnesium and iron when applied to biomedical implant applications; hence the increase in the amount of research investigations on the metal in the last few years. In this review, the current state-of-the-art on biodegradable Zn, including recent developments, current opportunities and future directions of research are discussed. The discussions are presented with a specific focus on reviewing the relationships that exist between mechanical properties, biodegradability, and biocompatibility of zinc with alloying and fabrication techniques. This work hopes to guide future studies on biodegradable Zn that will help in advancing this field of research. Statement of Significance (i) The review offers an up-to-date and comprehensive review of the influence of alloying and fabrication technique on mechanical properties, biodegradability and biocompatibility of Zn; (ii) the work cites the most relevant biodegradable Zn fabrication processes including additive manufacturing techniques; (iii) the review includes a listing of research gap and future research directions for the field of biodegradable Zn.

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“…In this sense, some authors have performed studies on electrochemical corrosion of as-solidified samples in order to correlate microstructure parameters with the resulting corrosion resistance 1,4,[6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

“…A recent study 6 investigated the corrosion behavior of two dilute Zn-Mg alloys: Zn-0.3wt.% Mg and Zn-0.5wt.% Mg. These alloys were unidirectionally solidified under a range of cooling rates, which permitted different microstructural morphologies to be formed (cellular and dendritic).…”

Section: Introductionmentioning

confidence: 99%

Effects of Macrosegregation and Microstructure on the Corrosion Resistance and Hardness of a Directionally Solidified Zn-5.0wt.%Mg Alloy

et al. 2019

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This study aims to analyze the influence of macrosegregation on microstructure evolution, and of microstructure length scale on the corrosion resistance of a Zn-5.0wt.%Mg alloy casting. The analyzed samples were taken along the length of castings unidirectionally solidified in unsteady state conditions of heat extraction. Microstructure characterization, microhardness, linear polarization and electrochemical impedance spectroscopy (EIS) tests were performed. A unique type of microstructure was observed, characterized essentially by a morphology typified by idiomorphic MgZn 2 crystals in a "complex eutectic mixture" [coexistence of stable (Zn+Mg 2 Zn 11 ) and metastable (Zn+MgZn 2 ) eutectics]. The correlation between thermal and microstructural parameters, permitted experimental growth laws, correlating the evolution of the lamellar eutectic spacing with the cooling rate to be established. Vickers microhardness and electrochemical corrosion tests showed that more refined microstructures associated with higher experimental cooling rates, are related to a better set of higher hardness and corrosion resistance.

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Directionally solidified dilute Zn-Mg alloys: Correlation between microstructure and corrosion properties

Cited by 17 publications

References 24 publications

Upward Unsteady-State Solidification of Dilute Al–Nb Alloys: Microstructure Characterization, Microhardness, Dynamic Modulus of Elasticity, Damping, and XRD Analyses

Upward Unsteady-State Solidification of Dilute Al–Nb Alloys: Microstructure Characterization, Microhardness, Dynamic Modulus of Elasticity, Damping, and XRD Analyses

The influence of alloying and fabrication techniques on the mechanical properties, biodegradability and biocompatibility of zinc: A comprehensive review

Effects of Macrosegregation and Microstructure on the Corrosion Resistance and Hardness of a Directionally Solidified Zn-5.0wt.%Mg Alloy

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