Effect of Gd content on high temperature mechanical properties of Mg–Gd–Y–Zr alloy

Nodooshan, H.R. Jafari; Wu, Guohua; Liu, Wencaı; Wei, Guangyu; Li, Yanlei; Zhang, Song

doi:10.1016/j.msea.2015.11.047

Cited by 96 publications

(15 citation statements)

References 27 publications

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“…In alloys without Ce, the main intermetallic compounds are gray with irregularly shaped particles A, and the energy spectrum indicates that the intermetallic compounds are Al 6 (Mn, Fe). After the addition of 0.254 ωt% Ce, some irregularly shaped white intermetallic compounds B appear, and the energy spectrum indicats that such intermetallic compounds are Al 8 Cu 4 Ce [26,27]. Comparing figures 4(a) and (b), it can be seen that the size of Al 6 (Mn, Fe) intermetallic compound of the alloy is significantly reduced after adding 0.254ωt% Ce.…”

Section: Resultsmentioning

confidence: 90%

Effect of Ce addition on microstructure, mechanical properties and corrosion behavior of Al-Cu-Mn-Mg-Fe alloy

Tian

Chen

et al. 2020

Mater. Res. Express

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The effects of rare earth Ce on the microstructure, mechanical properties and corrosion behavior of Al-Cu-Mn-Mg-Fe alloys were investigated by means of microstructure analysis, tensile test and electrochemical corrosion test. The research shows that the Al-Cu-Mn-Mg-Fe alloy after low temperature heat treatment mainly contains the S (Al 2 CuMg) phase, the T (Al 20 Cu 2 Mn 3 ) phase, the Al 6 (Mn, Fe) phase and the Al 7 Cu 2 Fe phase, and the rare earth Ce makes the alloy form the new rare earth phase Al8Cu4Ce. The appearance of this phase has a significant refinement effect on the Al 6 (Mn, Fe) phase. Compared with Ce-free, the yield strength and tensile strength of Al-Cu-Mn-Mg-Fe alloy with 0.254 ωt% Ce increased by 7% and 15%, respectively, and the elongation increased from 3.1% to 4.8%. It also has better corrosion resistance, which is represented by the decrease of corrosion current density and positive shift of corrosion potential in Tafel measurement in solutions of different concentrations, and the increase of corrosion impedance in electrochemical impedance spectroscopy test, especially the corrosion current density was reduced by 6.06 μA cm −2 in 3.5% NaCl solution.

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Section: Resultsmentioning

confidence: 90%

Effect of Ce addition on microstructure, mechanical properties and corrosion behavior of Al-Cu-Mn-Mg-Fe alloy

Tian

Chen

et al. 2020

Mater. Res. Express

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“…Considering the fact that Mg – Gd‐based alloy is one of the promising candidates for a novel high strength and heat‐resistant Mg‐based alloy due to its excellent room temperature and elevated temperature mechanical properties, the investigations on their HTS should be interesting. Although the HTS of binary Mg – Gd alloys with sparse composition points was studied using a constrained rod casting (CRC) apparatus attached with a load cell and data acquisition system, it is necessary to determine the HTS of Mg – Gd alloys with dense composition points in detail.…”

Section: Introductionmentioning

confidence: 99%

Hot Tearing Susceptibility of Binary Mg–Gd Alloy Castings and Influence of Grain Refinement

et al. 2018

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The hot tearing susceptibility (HTS) of binary Mg-Gd alloys is tested from 1.0 to 8.0 wt% using a constrained rod casting (CRC) mold. It is found that the curve of the HTS versus Gd content follows a typical "Λ" curve: HTS increases firstly, reaches a maximum at 1.5% Gd, and then decreases, which is in good agreement with the results predicted by Clyne-Davies model. Microstructure observations and thermodynamic calculations show that grain structure (size and morphology), the susceptible freezing range, the volume fraction of eutectic liquid, and the amount of intermetallics (Mg 5 Gd) are the main factors influencing the HTS of Mg-Gd experimental alloys. The highest HTS observed in Mg-1.5Gd alloy is attributed to its coarse columnar grains, the high freezing range, and the thin and continuous liquid film as well as the hard and brittle intermetallics precipitated along the grain boundaries. In contrast, the lowest HTS observed in Mg-8Gd alloy is mainly related to the fine equiaxed grains, which can effectively accommodate the strain during solidification, and the tear healing by eutectic liquid. Furthermore, the effect of grain refinement by Zr addition on the HTS is also studied, and the results show that grain refinement can significantly reduce the HTS.

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“…Recently, magnesium alloys have attracted great interest for applications in the automotive and aerospace industries owing to their strong need for lighter vehicles to reduce fuel consumption [1]. Addition of rare earth elements is one of the promising ways to enhance the room-and high-temperature mechanical properties and creep resistance of magnesium alloys [2][3][4][5][6][7][8][9]. Since the solubility of the rear earth elements declines with reducing temperature, the strength of these alloys is essentially enhanced by precipitation strengthening [1,10].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and High Temperature Tensile Properties of Mg–10Gd–5Y–0.5Zr Alloy after Thermo-Mechanical Processing

Nodooshan

Zeng

et al. 2018

Metals

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The microstructure, high-temperature tensile properties and fracture behavior of the Mg-10Gd-5Y-0.5Zr alloy after thermo-mechanical processing (pre-tension between solution and aging treatment) were investigated. The pre-deformed alloy shows the accelerated aging kinetics compared to the un-deformed alloy. Microstructure of pre-deformed samples showed not only the homogeneous nucleation of the precipitate but also heterogeneous nucleation of precipitates on the dislocation and twin boundaries. Tensile results show that the pre-deformation enhanced the strength of the alloy, while it deteriorates the ductility of the alloy. The ultimate tensile strength (UTS) of the T6 treated un-deformed and pre-deformed alloy at room temperature are 331 MPa and 366 MPa, respectively. Tensile strength of the T6 treated alloy in both un-deformed and deformed conditions was enhanced by raising the test temperature and then reduced by further raising the test temperature. The higher strength of the pre-deformed alloy could be related to the higher density of the precipitates, which grow on the twin boundaries and can hinder the dislocation movement and strengthen the alloy. The results shows that thermo-mechanical processing can significantly improve the room- and high-temperature mechanical properties and enhance the formation of precipitates in Mg-10Gd-5Y-0.5Zr alloy, which can lead to wider application of the alloy in industries such as aerospace or powertrains that need better room- and high-temperature mechanical properties.

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Effect of Gd content on high temperature mechanical properties of Mg–Gd–Y–Zr alloy

Cited by 96 publications

References 27 publications

Effect of Ce addition on microstructure, mechanical properties and corrosion behavior of Al-Cu-Mn-Mg-Fe alloy

Effect of Ce addition on microstructure, mechanical properties and corrosion behavior of Al-Cu-Mn-Mg-Fe alloy

Hot Tearing Susceptibility of Binary Mg–Gd Alloy Castings and Influence of Grain Refinement

Microstructure and High Temperature Tensile Properties of Mg–10Gd–5Y–0.5Zr Alloy after Thermo-Mechanical Processing

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