Microstructure evolution and grain refinement mechanism of fine-grained Mg-Gd-Y-Zn-Zr alloy during multi-directional forging

Zhao, Jingqi; Guo, Haoshan; Luo, Tengteng; Zhang, Chunxiang; Luo, Junting

doi:10.1016/j.jallcom.2022.167199

Cited by 22 publications

(3 citation statements)

References 39 publications

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“…The microstructure of materials is closely related to their mechanical properties. MDF greatly improves its hardness and strength, which is mainly due to the fact that SPD occurs in the MDF process [24,25], which can significantly refine the grain structure. On the one hand, the number of grain boundaries increases with grain refinement; on the other hand, the density of dislocations within the material also increases dramatically due to the increasing amount of deformation, so the comprehensive effect of the grain refinement mechanism and dislocation theory enhances the degree of work hardening and leads to a substantial increase in the hardness of the material.…”

Section: Discussionmentioning

confidence: 99%

Effect of Multidirectional Forging and Aging Treatment on Wear Properties of ZK61 Alloy

Zhang,

Xu,

et al. 2024

Materials

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This study investigated the effects of multidirectional forging (MDF) and aging treatments on the wear properties of ZK61 magnesium alloy. Dry sliding wear tests were performed on homogenized, MDF, and aged samples using a friction wear machine to analyze the surface morphology by scanning electron microscopy (SEM) and white light interferometry, as well as the hardness and tensile mechanical properties. The ZK61 magnesium alloy has higher sliding wear properties after MDF due to higher strength, hardness, and work hardening. Grain refinement affects the wear resistance of the material, but aging increases the hardness and tensile strength and decreases the wear resistance.

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Section: Discussionmentioning

confidence: 99%

Effect of Multidirectional Forging and Aging Treatment on Wear Properties of ZK61 Alloy

Zhang,

Xu,

et al. 2024

Materials

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“…Before starting each forging cycle, the billet was kept in the pre-heated furnace for 120 min. The multi-axial forging strategy for each cycle was shown in Figure 2 [ 13 ], after which the height-to-length ratio of the square billet was approximately 2. The forging strain rate of the billet was in the range of 5/s to 10/s.…”

Section: Methodsmentioning

confidence: 99%

β Grain Size Inhomogeneity of Large Scale Ti-5Al-5V-5Mo-3Cr Alloy Bulk after Multi-Cycle and Multi-Axial Forging in α + β Field

Qin

Liu

2023

Materials

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In order to fabricate homogeneous large-scale Ti-5Al-5V-5Mo-3Cr (Ti-5553) alloy bulk with fine and equiaxial β grain, we performed a series of multi-axial α + β field forging with 62 forging cycles on the large-scale Ti-5553 billet by using 12.5 MN high-speed hydraulic press. The β-annealed microstructure was the starting microstructure of the billet. After the 6th forging cycle, β grain deformed dramatically, and the grain-boundary network developed within the irregular β grain. As the forging cycle increased to 44, the volume fraction of the fine and equiaxial β grain that is less than 20 μm, which is caused by dynamic recrystallization, increased gradually. However, the incomplete dynamic recrystallization region within the original β grain could not be eliminated. As the forging cycle further increased, the volume fraction of the fine and equiaxial β grain did not increase. In contrast, the abnormal grain growth of the β phase occurred during 50th~62nd forging cycle. Here, we attribute the formation of the incomplete dynamic recrystallization region and the abnormal grain growth of the β phase to the high deformation rate of the α + β forging. The refining behavior of β grain and the abnormal coursing β grain, which is found during the multi-cycle multi-axial forging of large-scale Ti-5553 alloy billet, are seldom reported in the isothermal compression of small-scale Ti-5553 alloy specimen. The findings of the paper are instructive for improving the sub-transus forging strategy that is used to fabricate the large-scale homogeneity Ti-5553 alloy billet with fine and equiaxial β grain.

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“…The average grain size and volume fraction of precipitates in the as-cast alloys were measured by Image-Pro Plus 6.0 software. The average grain size was determined by the mean linear intercept method [19].…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Effect of Ca addition on the microstructure, mechanical properties and corrosion behavior of AZ61-Nd alloy

Zhang

Hou

Zhang

et al. 2022

Preprint

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The effect of Ca elements on the microstructure, mechanical properties and corrosion behavior of extruded AZ61-1Nd-xCa (x=0, 0.5, 1, 2 wt.%) alloys were investigated. The Al-Nd phase and Al2Ca particles are dynamically precipitated in the extruded alloys. The volume fraction of Al2Ca precipitates increases with the increase of Ca content. Moreover, the addition of Ca can refine the grain size. The tensile strength of the studied alloys remains almost constant and their hardness increases with increasing the Ca content. Regretfully, the presence of Al-Nd phase and brittle Al2Ca phase in the Ca-alloyed AZ61-Nd decreases significantly the elongation. The corrosion resistance of AZ61-1Nd alloy is conspicuously improved by the addition of 1 wt.% Ca, which is due to the uniformly and dispersedly distributed Al2Ca phase acting as a physical barrier. In this work, AZ61-1Nd-1Ca alloy with moderate strength and low corrosion rate was obtained, which is considered as a candidate material for application in marine environment.

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Microstructure evolution and grain refinement mechanism of fine-grained Mg-Gd-Y-Zn-Zr alloy during multi-directional forging

Cited by 22 publications

References 39 publications

Effect of Multidirectional Forging and Aging Treatment on Wear Properties of ZK61 Alloy

Effect of Multidirectional Forging and Aging Treatment on Wear Properties of ZK61 Alloy

β Grain Size Inhomogeneity of Large Scale Ti-5Al-5V-5Mo-3Cr Alloy Bulk after Multi-Cycle and Multi-Axial Forging in α + β Field

Effect of Ca addition on the microstructure, mechanical properties and corrosion behavior of AZ61-Nd alloy

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