The effect of Ca and rare earth elements on the microstructure, mechanical properties and corrosion behavior of AZ91D

Wu, Guohua; Fan, Yongzhe; Gao, Hui; Zhai, Chao; Zhu, Yiwu

doi:10.1016/j.msea.2005.08.011

Cited by 289 publications

(132 citation statements)

References 16 publications

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“…Magnesium alloys are promising candidates to replace steel and aluminum alloys in many struc-tural and mechanical applications owing to their attractive properties of excellent castability, good machinability, superior damping capacity, outstanding stiffness-to-weight ratio, and ease of recyclability [2][3][4]. The AM50 alloy is one of the most successfully-used magnesium alloys in the automotive industry; however, its application is still limited by its strength and most especially its poor corrosion resistance [5,6].…”

Section: Introductionmentioning

confidence: 99%

Corrosion and mechanical properties of AM50 magnesium alloy after modified by different amounts of rare earth element Gadolinium

et al. 2016

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Abstract:To improve the corrosion and mechanical properties of the AM50 magnesium alloy, different amounts of the rare earth element gadolinium were used. The microstructure, corrosion and mechanical properties were evaluated by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and electrochemical and mechanical stretch methods. The results indicate that, with Gd addition, the amount of the Al 2 Gd 3 phase increased while the β-Mg 17 Al 12 phase amount decreased. Due to the Gd addition, the grain of the AM50 magnesium alloy was significantly refined, which improved its tensile strength. Further, the decrease in the amount of the β phase improved the corrosion resistance of the alloy. The fracture mechanism of the Gd-modified AM50 magnesium alloy was a quasi-cleavage fracture. Finally, the optimum corrosion residual strength of the AM50 magnesium alloy occurred with 1 wt.% of added Gd.

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Section: Introductionmentioning

confidence: 99%

Corrosion and mechanical properties of AM50 magnesium alloy after modified by different amounts of rare earth element Gadolinium

et al. 2016

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“…On account of its relatively low cost and excellent castability, AZ91 is one of the most widely used magnesium alloys [5]. It has been shown that its chemical composition has a fundamental influence on its corrosion behaviour and mechanical properties [5][6][7][8][9]. The addition of rare earth elements improves the mechanical properties of magnesium alloys, especially the ultimate tensile strength, but decreases their corrosion resistance [6,9].…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that its chemical composition has a fundamental influence on its corrosion behaviour and mechanical properties [5][6][7][8][9]. The addition of rare earth elements improves the mechanical properties of magnesium alloys, especially the ultimate tensile strength, but decreases their corrosion resistance [6,9]. Furthermore, the presence of a small amount of bismuth and antimony significantly increases the corrosion rate of magnesium alloys [10].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the presence of a small amount of bismuth and antimony significantly increases the corrosion rate of magnesium alloys [10]. By contrast, some alloying elements such as silicon and calcium enhance the corrosion resistance of magnesium alloys [7,9]: calcium improves the corrosion resistance through the formation of the reticular Al 2 Ca phase, which acts as an effective barrier against corrosion, while the combined addition of Si and Sb enhances the corrosion resistance of AZ91 alloy [7]. It has been shown that the addition of calcium oxide to AZ91 alloy improved its corrosion resistance due to higher pitting potential and the refinement of the precipitates [11].…”

Section: Introductionmentioning

confidence: 99%

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The use of a multiscale approach in electrochemistry to study the corrosion behaviour of as-cast AZ91 magnesium alloy

Kot

Krawiec

2015

J Solid State Electrochem

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The microstructure of as-cast AZ91 alloy is complex, with the presence of Mg 17 (Al, Zn) 12 precipitates surrounded by an eutectic phase, AlMn intermetallic particles and an α-Mg solid solution. In addition, the distribution of aluminium in the alloy was found to be heterogeneous. Under these conditions, a multiscale approach coupling global and local electrochemical measurements seems to be a promising method to study its corrosion behaviour. Results show that the multiscale approach can be used in 0.1 M NaCl. In this case, AZ91 is susceptible to pitting corrosion. By contrast, the multiscale approach is not valid for AZ91 in 0.1 M Na 2 SO 4 . At the global scale, filiform corrosion and pitting corrosion are observed in the matrix, whereas only pits initiate when using the microcapillary techniques. The obtained results show that the local electrochemical techniques have to be used carefully in some environments.

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“…1,2) The most widely used magnesium alloys is AZ91, in which Al is the major alloying element. However, commercial magnesium alloys such as AZ91 and AM50 are limited because of poor creep resistance and poor mechanical properties at elevated temperature of 120 C. [2][3][4] The cause of this phenomenon is grain boundary phase Mg 17 Al 12 . This phase softens at high temperature.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Yttrium Element on Microstructure and Mechanical Properties of Mg-5 mass%Al-3 mass%Ca Based Alloys Fabricated by Gravity Casting and Extrusion Process

et al. 2008

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The as-cast microstructure of Mg-5Al-3Ca-xY alloy consists of dendritic -Mg matrix, (Mg, Al) 2 Ca eutectic phase and Al 2 Y intermetallic compounds. These two kind of (Mg, Al) 2 Ca compounds were observed: coarse irregular-shape structure at grain boundary and fine needle-shape structure in the -Mg matrix grain. This (Mg, Al) 2 Ca phase of the extruded alloys was elongated to extrusion direction and size of this phase was refined comparing with that of as-cast alloys because of severe deformation during hot extrusion. Maximum yield and ultimate strength value of extruded alloys was 326 and 331 MPa at Mg-5Al-3Ca-3Y alloy, respectively. From these results, it is conclusively demonstrated that Y additions on Mg-5Al-3Ca alloy have more effect to improve mechanical properties.

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The effect of Ca and rare earth elements on the microstructure, mechanical properties and corrosion behavior of AZ91D

Cited by 289 publications

References 16 publications

Corrosion and mechanical properties of AM50 magnesium alloy after modified by different amounts of rare earth element Gadolinium

Corrosion and mechanical properties of AM50 magnesium alloy after modified by different amounts of rare earth element Gadolinium

The use of a multiscale approach in electrochemistry to study the corrosion behaviour of as-cast AZ91 magnesium alloy

The Effects of Yttrium Element on Microstructure and Mechanical Properties of Mg-5 mass%Al-3 mass%Ca Based Alloys Fabricated by Gravity Casting and Extrusion Process

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