Investigation on the microstructure, texture and mechanical properties of Mg-Gd-Y(-Zn)-Zr alloys under indirect extrusion

Chi, Y.Q.; Liu, Jinwei; Zhou, Zhijie; Wu, Shouzhong; Liu, Weiqing; Zheng, Mingli

doi:10.1016/j.jallcom.2023.169061

Cited by 25 publications

(1 citation statement)

References 51 publications

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“…An inductively coupled plasma (ICP) analyzer was employed to analyze the chemical composition, and the actual composition of the as-cast alloy was Mg-9.12Gd-3.93Y-0.52Zr (wt.%). The homogenization treatment was performed at 510 • C for 12 h, followed by immediate warm water quenching at a temperature of ~80 • C [32,33].…”

Section: Materials Preparationmentioning

confidence: 99%

The Tensile Properties and Fracture Toughness of a Cast Mg-9Gd-4Y-0.5Zr Alloy

Ji,

Qiao,

Guan

et al. 2023

Crystals

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Low fracture toughness has been a major barrier for the structural applications of cast Mg-Gd-Y-Zr alloys. In this work, the tensile properties and fracture toughness of a direct-chill-cast Mg-9Gd-4Y-0.5Zr (VW94K) alloy were investigated in different conditions, including its as-cast and as-homogenized states. The results show that the tensile properties of the as-cast VW94K alloy are greatly improved after the homogenization treatment due to the strengthening of the solid solution. The plane strain fracture toughness values KIc of the as-cast and as-homogenized VW94K alloys are 10.6 ± 0.5 and 13.8 ± 0.6 MPa·m1/2, respectively, i.e., an improvement of 30.2% in KIc is achieved via the dissolution of the Mg24(Gd, Y)5 eutectic phases. The initiation and propagation of microcracks in an interrupted fracture test are observed via an optical microscope (OM) and scanning electron microscope (SEM). The fracture surfaces of the failed samples after the fracture toughness tests are examined via an SEM. The electron backscatter diffraction (EBSD) technique is adopted to determine the failure mechanism. The results show that the microcracks are initiated and propagated across the Mg24(Gd, Y)5 eutectic compounds in the as-cast VW94K alloy. The propagation of the main cracks exhibits an intergranular fracture pattern and the whole crack propagation path displays a zigzag style. The microcracks in the as-homogenized alloy are initiated and propagated along the basal plane of the grains. The main crack in the as-homogenized alloy shows a more tortuous fracture characteristic and a trans-granular crack propagation behavior, leading to the improvement of the fracture toughness.

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Section: Materials Preparationmentioning

confidence: 99%

The Tensile Properties and Fracture Toughness of a Cast Mg-9Gd-4Y-0.5Zr Alloy

Ji,

Qiao,

Guan

et al. 2023

Crystals

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Improvement of Mechanical Properties and Corrosion Resistance of As‐Extruded Mg–2Zn–2Al–0.3Mn Alloy Through Y Addition

Wang,

Yao,

Zhao

et al. 2024

Adv Eng Mater

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The microstructure of as‐extruded Mg–2Zn–2Al–0.3Mn–xY (0 ≤ x ≤ 5 wt%) alloys are investigated, revealing the influence of grain size and second‐phase particle size on the mechanical properties and corrosion resistance of alloys. Additionally, the alloy composition is optimized. In the results, it is indicated that all alloys undergo complete dynamic recrystallization. The average dynamic recrystallization grain size decreases, accompanied by the appearance of Al2Y and (Al, Zn)11Y3 particles whose contents and sizes increase as Y content increases. Therefore, the mechanical properties improve due to fine grain strengthening and fine particle dispersion strengthening, while corrosion resistance benefits also from the grain refinement at Y contents between 0 and 3 wt%. A rapid increase in size and number of larger second‐phase particles leads to a decrease in the alloys’ mechanical properties corrosion resistance, with excess addition of Y. Accordingly, an optimized Y addition is determined to be 3 wt% in this study.

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