Influence of undissolved second-phase particles on dynamic recrystallization behavior of Mg–7Sn–1Al–1Zn alloy during low- and high-temperature extrusions

Kim, Hyun Ji; Jin, Sang-Cheol; Jung, Jae‐Gil; Park, Sung Hyuk

doi:10.1016/j.jmst.2020.08.056

Cited by 47 publications

(8 citation statements)

References 46 publications

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“…In other words, in the cases of the ECAP 4P and 8P alloys, dynamic precipitation is dominant over dissolution of the Mg 2 Sn phase because of the abundance of Sn solute atoms in the Mg matrix and relatively low temperature. In contrast, with the further increase in ECAP passes to 12P, the actual temperature of the deformation zone is relatively high due to the heat produced by plastic deformation and friction during ECAP [26][27][28]. Meanwhile, Sn solute atoms in the Mg matrix may have been depleted after ECAP 8P.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

“…The ECAP 4P alloy has the strongest texture intensity of 50.38, while the ECAP 8P alloy possesses the weakest texture intensity of 18.76. It has been reported that unDRXed grains have a stronger basal texture than DRXed grains [26,29,30]. Thus, it is speculated that the variation in texture intensity is related to the change in the fraction of unDRXed grains.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

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Effect of Equal Channel Angular Pressing on the Microstructure and Mechanical Properties of an Mg–5Sn Alloy

Zhuo

Shao

Zhang

et al. 2022

Metals

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An Mg–5Sn alloy was processed by equal channel angular pressing (ECAP) for different passes (4P, 8P, and 12P), and the microstructure evolution and mechanical properties were investigated. The grain size, amount of Mg2Sn precipitates, and texture of ECAP alloys depend on the number of passes. The ECAP 8P alloy has the finest grains and largest area fraction of Mg2Sn particles, followed by the ECAP 12P alloy. The ECAP 4P and 8P alloys exhibit basal textures tilted towards transverse direction (TD), whereas the ECAP 12P alloy shows basal texture with the c-axis of the grains parallel to the extrusion direction (ED). ECAP alloys show superior strengths compared to the as-cast alloy, mainly attributed to fine grain strengthening, precipitation strengthening, texture strengthening, and dislocation strengthening. The ultimate tensile strength (UTS) increases while the elongation (EL) decreases with increasing ECAP pass.

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Section: Microstructure Evolutionmentioning

confidence: 99%

Section: Microstructure Evolutionmentioning

confidence: 99%

Effect of Equal Channel Angular Pressing on the Microstructure and Mechanical Properties of an Mg–5Sn Alloy

Zhuo

Shao

Zhang

et al. 2022

Metals

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“…Kim et al [ 105 ] reported on the DRX behavior of Mg-7Sn-1Al-1Zn alloy at an extrusion temperature of 250 °C and 450 °C. It was found that a large number of nanoscale Mg 2 Sn precipitates were formed which led to the formation of uniformed DRX grains, delaying DRX during the extrusion process at low temperature.…”

Section: Strengthening Mechanism Of Extrusionmentioning

confidence: 99%

Research Progress on Microstructure Evolution and Strengthening-Toughening Mechanism of Mg Alloys by Extrusion

et al. 2023

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Magnesium and magnesium-based alloys are widely used in the transportation, aerospace and military industries because they are lightweight, have good specific strength, a high specific damping capacity, excellent electromagnetic shielding properties and controllable degradation. However, traditional as-cast magnesium alloys have many defects. Their mechanical and corrosion properties cause difficulties in meeting application requirements. Therefore, extrusion processes are often used to eliminate the structural defects of magnesium alloys, and to improve strength and toughness synergy as well as corrosion resistance. This paper comprehensively summarizes the characteristics of extrusion processes, elaborates on the evolution law of microstructure, discusses DRX nucleation, texture weakening and abnormal texture behavior, discusses the influence of extrusion parameters on alloy properties, and systematically analyzes the properties of extruded magnesium alloys. The strengthening mechanism is comprehensively summarized, the non-basal plane slip, texture weakening and randomization laws are comprehensively summarized, and the future research direction of high-performance extruded magnesium alloys is prospected.

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“…The average size of the DRXed grains showed a gradual increase to 5.2 ± 0.4 µm, 6.5 ± 0.5 µm and 7.4 ± 0.5 µm as the extrusion temperature further rose to 300 • C, 350 • C and 400 • C, respectively. The impact of temperature on the DRX mechanism was the subject of several studies [34][35][36]. Shahzad and Wagner [34] showed that the fine DRXed grains at low extrusion temperatures were because of the formation of new crystals at the twin boundaries, whereas at elevated extrusion temperatures, the initial grain boundaries were the nucleation sites for new crystals.…”

Section: Microstructure Of the As-cast And Homogenized Alloysmentioning

confidence: 99%

“…Since DRX is a thermally activated metallurgical phenomenon, increasing extrusion temperature favored the DRX. However, excessive processing temperatures may lead to undesirable grain coarsening due to accelerated atomic diffusion [36]. Hence, the largest grain size after undergoing DRX was found for the alloy extruded at 400 exhibited very fine equiaxed DRXed grains (~2.1 ± 0.1 µm), and non-DRXed grains were subjected to deformation.…”

Section: Microstructure Of the As-cast And Homogenized Alloysmentioning

confidence: 99%

Evolution of Microstructure, Mechanical Properties, and Corrosion Resistance of Mg–2.2Gd–2.2Zn–0.2Ca (wt%) Alloy by Extrusion at Various Temperatures

Zengin

Ari²,

Turan

et al. 2023

Materials

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The current investigation involved casting the Mg–2.2Gd–2.2Zn–0.2Ca (wt%) alloy (GZX220) through permanent mold casting, followed by homogenization at 400 °C for 24 h and extrusion at 250 °C, 300 °C, 350 °C, and 400 °C. Microstructure investigations revealed that α-Mg, Mg–Gd, and Mg–Gd–Zn intermetallic phases were present in the as-cast alloy. Following the homogenization treatment, a majority of these intermetallic particles underwent partial dissolution into the matrix phase. α-Mg grains exhibited a considerable refinement by extrusion due to dynamic recrystallization (DRX). At low extrusion temperatures, higher basal texture intensities were observed. The mechanical properties were remarkably enhanced after the extrusion process. However, a consistent decline in strength was observed with the rise in extrusion temperature. The corrosion performance of the as-cast GZX220 alloy was reduced by homogenization because of the lack of corrosion barrier effect of secondary phases. A significant enhancement of corrosion resistance was achieved by the extrusion process.

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Influence of undissolved second-phase particles on dynamic recrystallization behavior of Mg–7Sn–1Al–1Zn alloy during low- and high-temperature extrusions

Cited by 47 publications

References 46 publications

Effect of Equal Channel Angular Pressing on the Microstructure and Mechanical Properties of an Mg–5Sn Alloy

Effect of Equal Channel Angular Pressing on the Microstructure and Mechanical Properties of an Mg–5Sn Alloy

Research Progress on Microstructure Evolution and Strengthening-Toughening Mechanism of Mg Alloys by Extrusion

Evolution of Microstructure, Mechanical Properties, and Corrosion Resistance of Mg–2.2Gd–2.2Zn–0.2Ca (wt%) Alloy by Extrusion at Various Temperatures

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