High temperature mechanical behavior of an extruded Mg–11Gd–4.5Y–1Nd–1.5Zn–0.5Zr (wt%) alloy

Yu, Zijian; Huang, Yuanding; Dieringa, Hajo; Mendis, C.L.; Guan, Renguo; Hort, Norbert; Meng, Jian

doi:10.1016/j.msea.2015.08.001

Cited by 26 publications

(3 citation statements)

References 36 publications

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“…Additionally, the most significant factor contributing to the strength of the EK30-xAg alloy under high-temperature tensile conditions is the strengthening effect of the β phase. In the process of the high-temperature tensile test, the β -phase particles located on the α -Mg grain boundaries can pin the α -Mg grain boundaries [ 43 ]. The presence of β -phase particles within the α -Mg grain can effectively impede dislocation slip.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of EK30 Alloy Synergistically Reinforced by Ag Alloying and Hot Extrusion for Aerospace Applications

et al. 2022

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Enhancing the mechanical properties of magnesium alloys to meet the urgent need for their lightweight applications in the aerospace field has always been a great challenge. Herein, the effect of Ag on the microstructure and tensile properties of the Mg−2.5Nd−1.0Sm−0.4Zn−0.1Ca−0.5Zr (EK30) alloy prepared by integrated extrusion and equal-channel angular pressing is studied. The microstructure of as-extruded alloys consists of α-Mg grains and the β phase. The addition of Ag increases the β-phase content. The β phase can promote dynamic recrystallization by inducing a particle-stimulated nucleation mechanism and inhibiting grain growth, which leads to grain refinement and texture weakening. At 250 °C, the ultimate tensile strength of the EK30–2.0Ag alloy (225.9 MPa) increased by 13.8% compared to the Ag-free alloy (198.4 MPa). When the tensile temperature increased from 25 °C to 250 °C, the ultimate tensile strength of the EK30–2.0Ag alloy decreased by 14.3%, from 263.7 MPa to 225.9 MPa. Notably, the addition of Ag slightly reduced the elongation of the alloy at 250 °C; the elongations of the EK30–2.0Ag alloy and the EK30 alloy are 41.5% and 37.0%, respectively. The elongation of the EK30–2.0Ag alloy increased from 22.7% at 25 °C to 52.7% at 275 °C. All alloy tensile fractures exhibited typical plastic fracture characteristics. This study provides an effective way to enhance the high-temperature mechanical properties of magnesium alloys by Ag alloying and a special severe plastic deformation method.

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Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of EK30 Alloy Synergistically Reinforced by Ag Alloying and Hot Extrusion for Aerospace Applications

et al. 2022

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“…The Mg-RE (RE-rare earth) series alloys have attracted significant attention in recent years owing to their outstanding heat resistance and mechanical properties [8][9][10]. Longperiod stacking ordered (LPSO) phases, which possess a special structure and excellent strengthening ability, in Mg-Zn-Re alloys have become a subject of intense research [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Substitution of Y with Yb and Ce on the Microstructures and Mechanical Properties of Mg88.5Zn5Y6.5

Liao

Lee

Song

et al. 2020

Metals

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The microstructures and mechanical properties of the Mg88.5Zn5Y6.5-XREX (RE = Yb and Ce, X = 0, 1.5, 3.0, and 4.5) (wt.%) alloys were investigated in the present study. Mg88.5Zn5Y6.5 is composed of three phases, namely, α-Mg, long-period stacking ordered (LPSO) phases, and intermetallic compounds. The content of the LPSO phases decreased with the addition of Ce and Yb, and no LPSO phases were detected in Mg88.5Zn5Y2.0Yb4.5. The alloys containing the LPSO phases possessed a stratified microstructure and exhibited excellent mechanical properties. Mg88.5Zn5Y5.0Ce1.5 exhibited the highest creep resistance and mechanical strength at both room temperature and 200 °C, owing to its suitable microstructure and high thermal stability. The yield strength of Mg88.5Zn5Y5.0Ce1.5 at room temperature was 358 MPa. The ultimate tensile strength of Mg88.5Zn5Y5.0Ce1.5 at room temperature and 200 °C was 453 MPa and 360 MPa, respectively.

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“…However, the LPSO structure cannot always play its strengthening role sufficiently due to the general problems of non-uniform distributed and coarse microstructures in casting process. In order to exert the advantages of LPSO structure and improve the properties of LPSO-containing Mg alloys further, many methods, such as alloying with additional elements (Gd, Nd, Mn, V, Sn, Zr, and so on) [5,6,7,8], controlling the process of solidification [9] and plastic deformation on alloy parts [10], have been conducted. Among the various methods, the addition of strontium, one of the alloying methods, is a common method to modify the microstructures of aluminum and magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

Modification of LPSO Structure in Mg-Ni-Y Alloy with Strontium

Yang

Lü

et al. 2018

MSF

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Effects of Sr levels on microstructure of the LPSO structure-containing Mg98.5-xNi0.5Y1.0Srx(x=0, 0.05, 0.10, 0.20 at.%) alloy were studied by SEM/EDS and XRD. Without Sr addition, the Mg98.5Ni0.5Y1.0alloy consists of α-Mg and LPSO structure and the block LPSO structure is distributed along the grain boundary. After adding 0.05 at.% Sr element into Mg98.5Ni0.5Y1.0alloy, the amount of dendrites decreased. With the increase of Sr content, the size of α-Mg grains decreases firstly and then increases. Meanwhile, the LPSO structure is refined. The addition of Sr element also results in the obvious increment of the amount of lamellar structure, which stretched from the grain boundary to the matrix. The excessive Sr in high Sr-content alloys participates in the form of Mg-Ni-Y-Sr compound, which is distributed in the vicinity of LPSO structure. In addition, the Sr can also promote the formation of Ni-rich and Y-rich phases.

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High temperature mechanical behavior of an extruded Mg–11Gd–4.5Y–1Nd–1.5Zn–0.5Zr (wt%) alloy

Cited by 26 publications

References 36 publications

Microstructure and Mechanical Properties of EK30 Alloy Synergistically Reinforced by Ag Alloying and Hot Extrusion for Aerospace Applications

Microstructure and Mechanical Properties of EK30 Alloy Synergistically Reinforced by Ag Alloying and Hot Extrusion for Aerospace Applications

Effects of Substitution of Y with Yb and Ce on the Microstructures and Mechanical Properties of Mg88.5Zn5Y6.5

Modification of LPSO Structure in Mg-Ni-Y Alloy with Strontium

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