Influence of Erbium, Cerium on the Stress Corrosion Cracking Behavior of AZ91 Alloy in Humid Atmosphere

Song, Yulai; Wang, Zhen; Liu, Yaohui; Yang, Meilian; Qu, Qingxiang

doi:10.1002/adem.201700021

Cited by 16 publications

(12 citation statements)

References 34 publications

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“…Though single-REE modification has been proven to improve the corrosion resistance and mechanical performance of Mg alloys, the action mechanisms of multi-REE modification are still unclear. Multiple REEs play different roles in improving material properties [16,17]. Thus, in this study, the effects of single or joint addition of Er and Gd on the corrosion resistance, mechanical properties, and residual strength of Mg alloys were investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Adding Rare Earth Elements Er and Gd on the Corrosion Residual Strength of Magnesium Alloy

et al. 2019

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The effects of the single and compound addition of rare earth Gd and Er on corrosion resistance and residual strength of as-cast AM50 magnesium alloy were studied using XRD, SEM, EDS, the weightlessness test, electrochemistry method, and tensile test. The results of XRD and SEM showed that Al 3 Er, Al 2 Gd 3 , and Al-Mn-Gd(Er) phases appeared in the alloy structure after the addition of rare earth Er and Gd. The results from the weightlessness test and Tafel curves show that the corrosion resistance of the modified composite rare earth was improved. Stress concentration caused by a corrosion pit is the direct cause of the tensile samples after corrosion. The corrosion residual strength of modified composite rare earth specimens is better than that of modified single rare earth samples. Fracture analysis indicates that the addition of rare earth elements did not change the fracture mechanism of the alloy, and the fracture was still the cleavage fracture.

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Section: Introductionmentioning

confidence: 99%

Effect of Adding Rare Earth Elements Er and Gd on the Corrosion Residual Strength of Magnesium Alloy

et al. 2019

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“…Because the content of Zn in AZ91 magnesium alloy is relatively less and does not participate in the chemical reaction, [9] AZ91-RE magnesium alloy is considered as Mg-Al-RE ternary alloy system in thermodynamic analysis. The rare earth elements Ce, Y, and Gd added to AZ91 magnesium alloy will be formed intermetallic compounds of Al 4 Ce, [10] Al 2 Y, [11] and Al 2 Gd [12] with Al in the alloy, so this study mainly focuses on the thermodynamic analysis of Al 4 Ce, Al 2 Y, and Al 2 Gd compounds. The formation ability and formation process of Al 4 Ce, Al 2 Y, and Al 2 Gd, and their effects on the microstructure of alloys were studied by the gibbs free energy of formation reaction of Al 4 Ce, Al 2 Y, and Al 2 Gd in Mg-Al-RE alloy melt.…”

Section: Research and Calculation Methodsmentioning

confidence: 99%

“…[16][17][18] Element ф 4and (5). Based on the datum in Table 2 and Equation (10), the relationship between standard formation gibbs free energy for reaction of pure substances to form Al-RE and temperature was calculated and fitted. Table 3 shows the relationship between the ΔG 0 and T.…”

Section: Gibbs Free Energy Of Al-re Compounds Formation In Mg-al-re Amentioning

confidence: 99%

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Thermodynamic Analysis of Al‐RE Phase Formation in AZ91‐RE (Ce, Y, Gd) Magnesium Alloy

Cai

Guo

et al. 2019

Physica Status Solidi (b)

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The Al-RE intermetallic compounds formed by adding rare earth elements into AZ magnesium alloy have important effects on the microstructure and properties of alloy. Based on classical thermodynamic theory and Miedema model and Toop model, the heat of formation of compounds in Mg-Al-RE (Ce, Y, Gd) ternary alloy and Gibbs free energy of Al-RE (Al 4 Ce, Al 2 Y, and Al 2 Gd) compounds are calculated theoretically, the order of formation of compounds in alloys and the formation process of Al-RE compounds are analyzed. The results show that, Al-RE (Al 4 Ce, Al 2 Y, and Al 2 Gd) compounds are preferentially formed in Mg-Al-RE (Ce, Y, Gd) alloys, Al-RE compounds are mainly formed before the crystallization of α-Mg solid solution; meanwhile, with the crystallization of α-Mg solid solution, Al-RE compounds can still be formed sustainably. The order of Al-RE compounds formation ability is Al 4 Ce, Al 2 Gd, and Al 2 Y, but the order of formation ability is Al 2 Gd, Al 2 Y, and Al 4 Ce, when adding the same mass fraction of rare earth (Ce, Y, Gd). In as-cast structure of AZ91-0.9 wt%; RE (Ce, Y, Gd) experimental alloys, Al-RE compounds mainly distributes at grain boundaries of alloys at two different scales, and the amount of β-Mg 17 Al 12 phase in alloys decreases relative to that of alloys without RE.

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“…In order to analyze the SCC susceptibility of the alloy, the SCC susceptibility index (Iscc) equation based on ultimate tensile strength (UTS) and elongation at failure (e f ) in the air and solution environment (S) was used as follows [19]:…”

Section: Slow Strain Rate Tensile (Ssrt)mentioning

confidence: 99%

Stress Corrosion Behavior of AM50Gd Magnesium Alloy in Different Environments

Yang

Liu

Zhang

et al. 2019

Metals

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A new type of high strength corrosion-resistant magnesium alloy was prepared by adding 1% rare earth Gd to AM50 and then treated with hot extrusion method. The stress corrosion properties of the new materials in air, pure water, 0.5 mol/L NaCl, and 0.5 mol/L Na2SO4 solution were studied by the slow strain rate tensile (SSRT) test, in situ open circuit potential test, Tafel curve test, stereomicroscope, SEM, and EDS. The results showed the following. The stress corrosion sensitivity of the material in different environments was Na2SO4 > NaCl > distilled water > air. According to the Tafel curves measured at 0 and 100 MPa, the corrosion voltage decreased little and the corrosion current density increased rapidly under 100 Pa. This was because the film of the corrosion product ruptured to form a large cathode and a small anode, which resulted in a large instantaneous corrosion current. The mechanism of hydrogen embrittlement and anodic dissolution together affected the stress corrosion behavior of the alloy. In distilled water, hydrogen embrittlement played a major role, while in NaCl and Na2SO4 solution, hydrogen embrittlement and anodic dissolution were both affected. The direct reason of the stress corrosion crack (SCC) samples’ failure was the cracks expanding rapidly at the bottom of pit, which was caused by corrosion.

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Influence of Erbium, Cerium on the Stress Corrosion Cracking Behavior of AZ91 Alloy in Humid Atmosphere

Cited by 16 publications

References 34 publications

Effect of Adding Rare Earth Elements Er and Gd on the Corrosion Residual Strength of Magnesium Alloy

Effect of Adding Rare Earth Elements Er and Gd on the Corrosion Residual Strength of Magnesium Alloy

Thermodynamic Analysis of Al‐RE Phase Formation in AZ91‐RE (Ce, Y, Gd) Magnesium Alloy

Stress Corrosion Behavior of AM50Gd Magnesium Alloy in Different Environments

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