Influence of long period stacking ordered phase arrangements on the corrosion behaviour of extruded Mg97Y2Zn1 alloy

Pérez, P.; Cabeza, Sandra; Garcés, G.; Adeva, P.

doi:10.1016/j.corsci.2016.02.024

Cited by 29 publications

(19 citation statements)

References 31 publications

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“…This cyclical loading caused faster degradation than that of the static immersion environment. Even though extruded Mg-Zn-Mn has high mechanical strength, the corrosion rate was higher under cyclical loading with interstitial flow conditions, perhaps due to the direction of extrusion 38 . Cyclic compressive stress can lead to premature failure of Mg-based alloys through crack formation and propagation 39 – 41 .…”

Section: Discussionmentioning

confidence: 99%

The Effects of Static and Dynamic Loading on Biodegradable Magnesium Pins In Vitro and In Vivo

Koo

Lee

Dong

et al. 2017

Sci Rep

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Here we systematically assess the degradation of biodegradable magnesium pins (as-drawn pure Mg, as-cast Mg-Zn-Mn, and extruded Mg-Zn-Mn) in a bioreactor applying cyclical loading and simulated body fluid (SBF) perfusion. Cyclical mechanical loading and interstitial flow accelerated the overall corrosion rate, leading to loss of mechanical strength. When compared to the in vivo degradation (degradation rate, product formation, uniform or localized pitting, and stress distribution) of the same materials in mouse subcutaneous and dog tibia implant models, we demonstrate that the in vitro model facilitates the analysis of the complex degradation behavior of Mg-based alloys in vivo. This study progresses the development of a suitable in vitro model to examine the effects of mechanical stress and interstitial flow on biodegradable implant materials.

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Section: Discussionmentioning

confidence: 99%

The Effects of Static and Dynamic Loading on Biodegradable Magnesium Pins In Vitro and In Vivo

Koo

Lee

Dong

et al. 2017

Sci Rep

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“…Generally speaking, in addition to promoting the galvanic corrosion of magnesium alloys, the second phase in magnesium alloys can also act as a corrosion barrier to hinder the corrosion of alloys [24]. Whether accelerated corrosion or hindered corrosion depends on the quantity and distribution of the second phase.…”

Section: Corrosion Performancementioning

confidence: 99%

“…Because of its very low corrosion rate, it becomes an effective obstacle to alloy corrosion. Literature [25] think LPSO phase in the magnesium alloy surface is a layer of passivation film, the passive film in a relatively wide range of pH value is stable, can be as a semiconductor, which severely restrict ions in and out of the channel, but relatively easy to make an electron or a hole through, so that the existence of the passivation membrane can effectively block the solute transport process in the solution, such as metal ions (Mg 2+ ) into the solution of the rate, when Mg 2+ into the solution of the rate of less than the rate of migration of electrons from the anode to cathode, anode process is restrained, metal dissolution rate is reduced, in addition, The contact of the active anion (such as C1 − ) in the corrosive medium with α-Mg through hydroxides or oxide films is also hindered, all of which inhibit the electrode reaction and chemical reaction, thus improving the corrosion resistance of the alloy. When the volume fraction of LPSO phase in the alloy decreases, this blocking ability weakens, so the corrosion resistance of the four extruded alloys increases with the volume fraction of LPSO phase.…”

Section: Corrosion Performancementioning

confidence: 99%

Effect of Y/Zn ratio on microstructure and properties of as-extruded Mg-Y-Zn alloys

Liu

Yang

Wang

et al. 2020

Mater. Res. Express

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In this work, four Mg-Y-Zn alloys with specific Y/Zn (wt%) ratio have been prepared. The effects of Y/Zn (wt%) on the microstructure of extruded Mg-Y-Zn alloy were investigated by SEM and TEM. The mechanical properties and corrosion behavior of extruded Mg-Y-Zn alloy were also studied by tensile test, electrochemical and immersion measurements. The corrosion mechanism was studied by SEM observation of the surface morphology of the samples after immersion corrosion. The result indicates that the as-extruded Mg-6Y-3Zn alloy consists of α-Mg, W phase and long-period stacking ordered structure (LPSO) phases. Two types of LPSO structure (18 R and 14 H) appear in the asextruded alloys. The volume fraction of LSPO increases with the increase of Y and Zn atoms witht the same Y/Zn mass ratio. Mg-9Y-3Zn alloy has the best comprehensive mechanical properties. Its yield strength, ultimate tensile strength and elongation are 230 MPa, 327mpa and 23% respectively, because the volume fraction of LSPO phase in the alloy is the highest. In addition, the higher volume fraction of LPSO is beneficial to enhance the corrosion resistance of Mg-9Y-3Zn alloy.Magnesium alloys have a series of performance advantages, such as low density, good specific strength and stiffness, good casting performance and processing performance, and also has low elastic modulus, vibration and noise reduction, etc, which have been widely applied in 3 C, aerospace and automobile fields [1-3]. However, the unavoidable problem is the low strength and poor corrosion resistance of magnesium alloys [4][5][6]. Therefore, researchers have done a lot of research on the strengthening and corrosion behavior of magnesium alloys [7][8][9][10].In improving the strength of magnesium alloys, magnesium rare earth alloys are the most successful systems. Recent studies have found that adding a small amount of Zn to certain Mg-RE alloys can generate a novel longperiod stacking ordered structure (referred to as long-period structure, LPSO structure) under appropriate addition amounts and process conditions. In-depth research shows that there are three types of ternary equilibrium phases in Mg-Zn-Y alloys, which are Mg 3 YZn 6 (I-phase icosahedral quasi-crystal structure and quasi-periodic order), Mg 3 Y 2 Zn 3 (W-phase face-centered cubic structure) and Mg 12 ZnY (X-phase long period stacked ordered structure, including 6 H, 14 H and 18 R) [8]. At the same time, it is generally believed that the phase composition of the alloy depends on the Y/Zn molar ratio [9]. It is reported that LSPO is an important strengthening phase in Mg-Y-Zn alloy, and the common structures are 18 R and 14 H [10]. After heat treatment at 350°C-500°C, 18 R structure will be transformed into 14 H LPSO structure [11]. Wang J F et al reported that the LPSO structural phase can improve the mechanical properties of magnesium alloys while maintaining the good damping capacity of the alloys, and the LPSO phase arranged along the extrusion direction can act as the hardening phase [12]. It is known that hot extrusi...

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“…Furthermore, the LPSO‐containing Mg alloys possess superior heat resistance compared with LPSO‐free Mg alloys . The corrosion behavior of Mg alloy with LPSO phase also has been studied widely . It is commonly accepted that the volume fraction and distribution of LPSO phases have a dual effect on the corrosion properties of Mg alloys .…”

Section: Introductionmentioning

confidence: 99%

“…The corrosion behavior of Mg alloy with LPSO phase also has been studied widely . It is commonly accepted that the volume fraction and distribution of LPSO phases have a dual effect on the corrosion properties of Mg alloys . The discrete and small amounts of LPSO phases, which is nobler than Mg matrix, would accelerate the corrosion rate of Mg matrix .…”

Section: Introductionmentioning

confidence: 99%

Effects of volume fraction of Ni‐containing LPSO phase on mechanical and corrosion properties of Mg‐Gd‐Ni alloys

Han

Zhang

Yang³

et al. 2018

Materials & Corrosion

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Mg‐Gd‐Ni alloys with same Gd/Ni mole ratios but different volume fraction of Ni‐containing LPSO phase were prepared. The effects of the volume fraction of Ni‐containing LPSO phase on the mechanical and corrosion properties of Mg‐Gd‐Ni alloys were systematically investigated. It was found that the strength was remarkably enhanced but the plasticity was decreased with the increase of the volume fraction of Ni‐containing LPSO phase. The electro‐potential distribution characteristic shows that the Ni‐containing LPSO phase had a lower electro‐potential than the Mg matrix, which was related to the existence of Ni in LPSO phase. Consequently, Ni‐containing LPSO phase was preferentially eroded during micro‐galvanic corrosion. High volume fraction LPSO phases accelerated the corrosion rate of Mg‐Gd‐Ni alloy. The detailed corrosion mechanisms were discussed in the present study.

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Influence of long period stacking ordered phase arrangements on the corrosion behaviour of extruded Mg97Y2Zn1 alloy

Cited by 29 publications

References 31 publications

The Effects of Static and Dynamic Loading on Biodegradable Magnesium Pins In Vitro and In Vivo

The Effects of Static and Dynamic Loading on Biodegradable Magnesium Pins In Vitro and In Vivo

Effect of Y/Zn ratio on microstructure and properties of as-extruded Mg-Y-Zn alloys

Effects of volume fraction of Ni‐containing LPSO phase on mechanical and corrosion properties of Mg‐Gd‐Ni alloys

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