The relation between microstructure and corrosion behavior of Mg-Gd-Zn alloy with long period stacking ordered structure

Zhang, J.-S.; Wang, D.; Zhang, W.-B.; Pei, Haixiang; You, Zhi-yong; Xu, Chunxiang; Cheng, Weili

doi:10.1002/maco.201407696

Cited by 18 publications

(4 citation statements)

References 32 publications

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“…There are long period stacking ordered (LPSO) phase, W phase (Mg 3 Zn 3 RE 2 ) and I phase (Mg 3 Zn 6 RE) formed when Zn/RE atomic ratio is different, which would influence its mechanical properties and corrosion resistance. As reported the corrosion resistance of Mg 95.5 Gd 3.5 Zn 1 with LPSO phase is better than that those without LPSO phase owing to the less accelerating corrosion process of LPSO phase [22], which was in agreement with Zhang's study [23]. Xu et al [24] pointed out that the quasicrystal I phase has a series of advantages, such as high hardness, low interfacial energy, outstanding corrosion resistance, etc.…”

Section: Introductionsupporting

confidence: 80%

Microstructure and Corrosion Behavior of the As-Extruded Mg–4Zn–2Gd–0.5Ca Alloy

Niu

Cao

Deng

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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In order to study the corrosion resistance of extruded magnesium alloys, the Mg-4Zn-2Gd-0.5Ca alloy was extruded at the speed of 0.01-0.1 mm/s with the temperature of 280-360 °C in present study. Hot extrusion results show that the volume fraction of precipitates (V pre ), V DRX (the dynamic recrystallization rate) and the average size of DRXed grain (d DRX ) decrease with the decrease in extrusion speed, and the corrosion rate of the alloy also shows a downward trend. On the contrary, the values of V pre , V DRX and d DRX increase with the increase in extrusion temperature, and the corrosion resistance of Mg-4Zn-2Gd-0.5Ca alloy decreases. When the extrusion speed is 0.01 mm/s and the extrusion temperature is 280 °C, the alloy has the best corrosion resistance. The corrosion of extruded Mg-4Zn-2Gd-0.5Ca alloy occurs preferentially on the magnesium matrix around W and I phases in the DRXed zone. With the further corrosion, the corrosion continues to spread along the phase, and the corrosion area gradually increases. Galvanic corrosion plays a leading role in the corrosion process. Moreover, there are a large number of basal plane textures in the unDRXed region, which is conducive to improving the corrosion resistance of magnesium alloys. In addition, the decrease in grain size also makes the corrosion of magnesium alloy more uniform.

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Section: Introductionsupporting

confidence: 80%

Microstructure and Corrosion Behavior of the As-Extruded Mg–4Zn–2Gd–0.5Ca Alloy

Niu

Cao

Deng

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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“…Previous studies have proved that Mg–RE–Zn alloys possess very attractive mechanical properties and high corrosion resistance derived from long period stacking ordered (LPSO) structures or stacking faults (SFs), where RE is short for rare earth, such as Gd (Zhang, Ba, et al, ; Zhang, Wang, et al, ; Zhang, Wang, Ba, Wang, & Xue, ; Zhang, Zhang, Liu, Yang, & Wang, ), Dy (Bi et al, ; Peng et al, ), Ho (Zhang, Zhang, et al, ), and Er (Leng et al, ; Zhang, Xu, et al, ). The LPSO structures and SFs contain high levels of the solute elements RE and Zn, and can inhibit basal slip, activate non‐basal slip, and further refine Mg recrystallized grains during hot working, thus significantly improving the mechanical properties of these Mg alloys (Jiao et al, ; Leng et al, ; Xu, Han, & Xu, ; Zhang, Zhang, et al, ; Zhang, Xu, et al, ; Zhang, Zhang, et al, ; Zou, Chen, & Chen, ).…”

Section: Introductionmentioning

confidence: 99%

“…activate non-basal slip, and further refine Mg recrystallized grains during hot working, thus significantly improving the mechanical properties of these Mg alloys Leng et al, 2013;Xu, Han, & Xu, 2016;Zou, Chen, & Chen, 2018). Furthermore, a significant improvement in resistance to corrosion was reported for LPSOcontaining Mg-Gd-Zn-based alloys (Zhang, Ba, et al, 2014;Zhang, Ba, Wang, Wu, & Xue, 2016;Zhang, Wang, et al, 2015) and SF-containing Mg-Ho-Zn and Mg-Er-Zn alloys (Leng et al, 2013;. We have recently studied the corrosion behavior of SF-containing Mg-3Gd-1Zn-0.4Zr alloy by quasi insitu scanning transmission electron microscopy, supplemented by scanning electron microscopy method prior to and following only 1 min immersion in 0.1M NaCl solution.…”

mentioning

confidence: 99%

Corrosion behavior and mechanical degradation of as‐extruded Mg–Gd–Zn–Zr alloys for orthopedic application

et al. 2019

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The microstructures, corrosion behavior, and mechanical degradation of the as‐extruded Mg–6.0Gd–0.5Zn–0.4Zr (wt %, GZ60K) and Mg–6.0Gd–1.0Zn–0.4Zr (wt %, GZ61K) alloys were investigated. In both alloys, stacking faults and precipitates are formed in the recrystallized microstructures. The corrosion rate of GZ61K calculated by the hydrogen evolution in simulated body fluid is 0.34 ± 0.13 mm/year, which is lower than that of GZ60K (0.45 ± 0.09 mm/year); and the current density of GZ61K (5.23 ± 1.41 μA cm−2) is much lower than that of GZ60K (11.95 ± 3.37 μA cm−2). The corrosion results indicate GZ61K is more resistant to corrosion than GZ60K, but GZ60K presents more uniform corrosion mode as compared to GZ61K. After immersion in simulated body fluid for 7, 14, and 21 days, a slight decrease in the strength of both alloys is observed. The yield strength half‐life is assessed for mechanical degradation and determined to be 125 and 85 days for GZ60K and GZ61K, respectively. The as‐extruded GZ60K alloy with more uniform corrosion and longer mechanical integrity shows promising potential for orthopedic application.

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“…[29][30][31][32][33][34][35][36][37] In contrast, the role of chemically distinct LPSO phase on the corrosion of Mg-Gd-Zn alloys in NaCl is contradictory and hence not clear. [38][39][40][41] Studies on the variation of corrosion behavior of the Mg-RE-Zn alloy system (irrespective of the RE alloying element) as a function of chemically distinct SFs and (or) LPSO phase remain limited. In most cases, parameters such as composition, additional phases, processing and heat-treatment conditions of Mg-RE-Zn alloys are not isolated in studying the role of chemically distinct SFs and (or) LPSO phase in terms of corrosion morphology.…”

mentioning

confidence: 99%

A Closer Look at the Role of Nanometer Scale Solute-Rich Stacking Faults in the Localized Corrosion of a Magnesium Alloy GZ31K

Zhang

Kairy

Dai

et al. 2018

J. Electrochem. Soc.

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The localized corrosion of as-cast Mg-3Gd-1Zn-0.4Zr (GZ31K) was investigated herein. Assessment of this alloy was carefully selected owing to the presence of chemically distinct stacking faults (SFs) in the α-Mg matrix. The role of a nanometer scale solute-rich SFs on localized corrosion was realized by quasi in-situ scanning transmission electron microscopy (STEM), supplemented by scanning electron microscopy (SEM) and electrochemical methods. It was determined that chemically distinct SFs were highly enriched in Gd and Zn. When the Mg-3Gd-1Zn-0.4Zr alloy was exposed to quiescent 0.1M NaCl, the α-Mg matrix at the periphery of solute-rich SFs was preferentially dissolved. In addition, re-deposition of Zn and Gd was observed upon the α-Mg matrix, accompanying matrix dissolution. Such findings elucidate the relative inertness of solute-rich SFs at this near atomic length scale for the first time, revealing both the nanoscale localized corrosion morphology and unambiguously revealing re-deposition of alloying elements at this scale. Distortion and disintegration of solute-rich SFs at corrosion sites indicate an evolution of stress during the α-Mg matrix dissolution and Mg oxide/hydroxide formation. Localized corrosion morphology on the micrometer scale revealed that the α-Mg matrix surrounding coarser eutectic phase particles was protected as a result of localized alkalinity by the eutectic phase.

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The relation between microstructure and corrosion behavior of Mg-Gd-Zn alloy with long period stacking ordered structure

Cited by 18 publications

References 32 publications

Microstructure and Corrosion Behavior of the As-Extruded Mg–4Zn–2Gd–0.5Ca Alloy

Microstructure and Corrosion Behavior of the As-Extruded Mg–4Zn–2Gd–0.5Ca Alloy

Corrosion behavior and mechanical degradation of as‐extruded Mg–Gd–Zn–Zr alloys for orthopedic application

A Closer Look at the Role of Nanometer Scale Solute-Rich Stacking Faults in the Localized Corrosion of a Magnesium Alloy GZ31K

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