Tensile and compressive deformation behavior of peak-aged cast Mg–11Y–5Gd–2Zn–0.5Zr (wt%) alloy at elevated temperatures

Lu, Jiawei; Yin, Dongdi; Ren, Lingbao; Quan, Gaofeng

doi:10.1007/s10853-016-0266-0

Cited by 23 publications

(7 citation statements)

References 41 publications

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“…Magnesium alloys have received intensive research attentions in the near decades because of their low density and high specific strength. Though Mg‐rare earth (RE) series alloys with high strength have been fabricated through large amounts of heavy rare earth elements addition (such as Mg–Gd–Y (GW) series alloys), their usage are still restricted, because of high cost. Hence, improving the mechanical properties without increasing price is of substantial significance for the commercialization of Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

Strength and Ductility Balance on an Extruded Mg–Zn–Ca–La Alloy

Zheng

Qiao

et al. 2017

Adv Eng Mater

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Mg-6Zn-0.7Ca-0.2La (wt%) alloy is cast and extruded in the present study. The microstructure of the as-extruded Mg-6Zn-0.7Ca-0.2La (wt%) alloy is investigated via scanning electron microscopy (SEM), transmission electron microscope (TEM) and electron backscattering diffraction (EBSD). Results show that the as-extruded Mg-6Zn-0.7Ca-0.2La (wt%) alloy exhibited a balanced strength and ductility with the yield strength of 261 MPa and elongation-to-fracture of 20.7%. The superior strength is mainly attributed to grain refinement and precipitates, whereas the plasticity is ascribed to fine homogenous microstructure and weaker texture. The fine microstructure is obtained in the as-extruded Mg-6Zn-0.7Ca-0.2La (wt%) alloy, mainly attributing to the dynamic recrystallization and pinning effects from precipitates.

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Section: Introductionmentioning

confidence: 99%

Strength and Ductility Balance on an Extruded Mg–Zn–Ca–La Alloy

Zheng

Qiao

et al. 2017

Adv Eng Mater

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“…The Q values of AZ41, AZ61, and AZ80 decreased with increasing Al content. The reason was that the β -Mg 17 Al 12 phase particles become softened at temperatures exceeding 423 K [ 29 ], and the second phase particles at the GBs weaken the obstacles to dislocation motion, thereby reducing the deformation activation energy of the alloy. However, for the experimental alloy, the relatively high deformation activation energy may be explained in terms of two effects.…”

Section: Resultsmentioning

confidence: 99%

Constitutive Equation and Hot Processing Map of Mg-16Al Magnesium Alloy Bars

Wang

et al. 2020

Materials

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A Gleeble-2000D thermal simulation machine was used to investigate the high-temperature hot compression deformation of an extruded Mg-16Al magnesium alloy under various strain rates (0.0001–0.1 s−1) and temperatures (523–673 K). Combined with the strain compensation Arrhenius equation and the Zener–Hollomon (Z) parameter, the constitutive equation of the alloy was constructed. The average deformation activation energy, Q, was 144 KJ/mol, and the strain hardening index (n ≈ 3) under different strain variables indicated that the thermal deformation mechanism was controlled by dislocation slip. The Mg-16Al alloy predicted by the Sellars model was characterized by a small dynamic recrystallization (DRX) critical strain, indicating that Mg17Al12 particles precipitated during the compression deformation promoted the nucleation of DRX. Hot processing maps of the alloy were established based on the dynamic material model. These maps indicated that the high Al content, precipitation of numerous Mg17Al12 phases, and generation of microcracks at low temperature and low strain rate led to an unstable flow of the alloy. The range of suitable hot working parameters of the experimental alloy was relatively small, i.e., the temperature range was 633–673 K, and the strain rate range was 0.001–0.1 s−1.

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“…As shown in Fig. 10, the alloys with UTS higher than 300 MPa are all T6-staged alloys, suggesting that precipitates play an important role in strengthening the LPSOcontaining cast alloys [32,58,59,78,83,100,107,117].…”

Section: Room-temperature Mechanical Propertiesmentioning

confidence: 89%

Microstructure and Mechanical Properties of Mg–RE–TM Cast Alloys Containing Long Period Stacking Ordered Phases: A Review

Liu

Huang

Sun

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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Casting magnesium alloys hold the greatest share of magnesium application products due to their short processing period, low cost and near net shape forming. Compared with conventional commercial magnesium alloys or other Mg-RE-based alloys, the novel Mg-RE-TM cast alloys with long period stacking ordered (LPSO) phases usually possess a higher strength and are promising candidates for aluminum alloy applications. Up to now, two ways: alloying design and casting process control (including subsequent heat treatments), have been predominantly employed to further improve the mechanical properties of these alloys. Alloying with other elements or ceramic particles could alter the solidification pattern of alloys, change the morphology of LPSO phases and refine the microstructures. Different casting techniques (conventional casting, rapidly solidification, directional solidification, etc.) introduce various microstructure characteristics, such as dendritic structure, nanocrystalline, metastable phase, anisotropy. Further heat treatments could activate the transformation of various LPSO structures and precipitation of diverse precipitates. All these evolutions exert great impacts on the mechanical properties of the LPSO-containing alloys. However, the underlying mechanisms still remain a subject of debate. Therefore, this review mainly provides the state of the art of the casting magnesium alloys research and the accompanying challenges and summarizes some topics that merit future investigation for developing high-performance Mg-RE-TM cast alloys.

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Tensile and compressive deformation behavior of peak-aged cast Mg–11Y–5Gd–2Zn–0.5Zr (wt%) alloy at elevated temperatures

Cited by 23 publications

References 41 publications

Strength and Ductility Balance on an Extruded Mg–Zn–Ca–La Alloy

Strength and Ductility Balance on an Extruded Mg–Zn–Ca–La Alloy

Constitutive Equation and Hot Processing Map of Mg-16Al Magnesium Alloy Bars

Microstructure and Mechanical Properties of Mg–RE–TM Cast Alloys Containing Long Period Stacking Ordered Phases: A Review

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