Plastic deformation mechanism and hardening mechanism of rolled Rare-Earth magnesium alloy thin sheet

Deng, Jia-fei; Tian, Jing; Zhou, Yancai; Chang, Yuanying; Liang, Wei; Ma, Jinyao

doi:10.1016/j.matdes.2022.110678

Cited by 47 publications

(5 citation statements)

References 37 publications

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“…Based on SEM images and EBSD data acquired during tensile testing, slip trace analysis was performed to identify activated slip systems. The following common slip systems in magnesium alloys are considered [ 18 , 29 , 30 , 31 , 32 ]:…”

Section: Methodsmentioning

confidence: 99%

“…However, due to the close-packed hexagonal structure of magnesium, and the strong (0002) basal texture is easily formed during the rolling process of the sheet [ 14 , 15 ], few slip systems can be activated under common conditions [ 16 ], and rolling will lead to defects in the sheet [ 17 ]. When conventional rolling is used to produce magnesium alloy sheets, there are problems such as a long rolling process, low yield, and high production cost [ 18 ], and the sheet after rolling has high hardness and insufficient ductility. Therefore, annealing heat treatment is a necessary process for the rolled magnesium alloy sheet.…”

Section: Introductionmentioning

confidence: 99%

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Quasi-In-Situ Analysis of As-Rolled Microstructure of Magnesium Alloys during Annealing and Subsequent Plastic Deformation

et al. 2022

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In this paper, quasi-in situ experiments were carried out on rolled AZ31 magnesium alloy sheets to track the recrystallization behavior of the rolled microstructure during the heat treatment process and the plastic deformation behavior during the stretching process. The as-rolled microstructures are classified into five characteristics and their plastic deformation behaviors are described. The research shows that annealing recrystallization leads to grain reorganization, resulting in the diversity of grain orientation, and it is easier to activate basal slip. Recrystallization preferentially nucleates in the regions with high stress, while it is difficult for recrystallization to occur in regions with low stress, which leads to the uneven distribution of the as-rolled structure of magnesium alloys. Slip can be better transmitted between small grains, while deformation between large and small grains is difficult to transmit, which can easily lead to the generation of ledges. Incomplete recrystallization is more likely to accumulate dislocations than complete recrystallization, and ledges are formed in the early stage of deformation. Microcracks are more likely to occur between strain-incompatible grains. It is of great significance to promote the application of rolled AZ31 magnesium alloys for the development of heat treatment and subsequent plastic working of rolled magnesium alloys.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quasi-In-Situ Analysis of As-Rolled Microstructure of Magnesium Alloys during Annealing and Subsequent Plastic Deformation

et al. 2022

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“…At present, the research of magnesium alloy sheet bending process is mainly focused on the AZ series magnesium alloy, and most of the research is the AZ31 magnesium alloy, while the research of rare earth magnesium alloy is less prominent [13,14]. While AZ series magnesium alloys have many advantages, they also have shortcomings, including low strength, unstable quality, and poor heat resistance, and the addition of rare-earth elements can improve their performance significantly [15][16][17]. Therefore, researchers have developed a large number of Mg-Gd-, Mg-Y-, Mg-Nd-based magnesium alloys.…”

Section: Finite Element Simulation Of U-bending Of High-strength Mg-g...mentioning

confidence: 99%

“…While AZ series magnesium alloys have many advantages, they also have shortcomings, including low strength, unstable quality, and poor heat resistance, and the addition of rare-earth elements can improve their performance significantly [15][16][17]. Therefore, researchers have developed a large number of Mg-Gd-, Mg-Y-, Mg-Nd-based magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Simulation and Experimental Study of U-Bending Forming of High-Strength Mg-Gd-Y-Zn-Zr Alloy

Wang

Huang

Xing

et al. 2023

Metals

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In this study, the constitutive equation of the high-strength Mg-Gd-Y-Zn-Zr alloy sheet was established by tensile tests at different temperatures and different tensile rates. The U-shape bending forming process of the sheet was simulated under different process conditions by the DEFORM software. The variation rules of the stress field, strain field and free bending force of the formed parts were analyzed, and the accuracy of the finite element simulation was verified by the U-shaped bending test. Studies have shown that the equivalent stress, equivalent strain and free bending force decreased with the increase in forming temperature. With an increase in the stamping speed, the equivalent stress and free bending force increased, while the equivalent strain did not change significantly. Notably, the maximum difference in the free bending force between the test and simulation was less than 10%. The results of this study can provide guidance for the stamping forming of high-strength Mg-Gd-Y-Zn-Zr alloy sheets.

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“…At the same time, Mg has a very low density, i.e., about 33.6% lighter than Al and Ti, and 75% lighter than steel [2]. Mg is strengthened by additives [3][4][5], heat, and plastic treatment [6], e.g., ECAP technology [7,8]. Numerous alloys are formed based on a Mg matrix, and the most frequently tested magnesium alloys include AZ31, ZE41, AZ61, AM60, AZ61, AZ80, and AZ91 [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Research of FSW Joints of AZ91 Magnesium Alloy

et al. 2023

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For the friction stir welding (FSW) of AZ91 magnesium alloy, low tool rotational speeds and increased tool linear speeds (ratio 3.2) along with a larger diameter shoulder and pin are utilized. The research focused on the influence of welding forces and the characterization of the welds by light microscopy, scanning electron microscopy with an electron backscatter diffraction system (SEM-EBSD), hardness distribution across the joint cross-section, joint tensile strength, and SEM examination of fractured specimens after tensile tests. The micromechanical static tensile tests performed are unique and reveal the material strength distribution within the joint. A numerical model of the temperature distribution and material flow during joining is also presented. The work demonstrates that a good-quality joint can be obtained. A fine microstructure is formed at the weld face, containing larger precipitates of the intermetallic phase, while the weld nugget comprises larger grains. The numerical simulation correlates well with experimental measurements. On the advancing side, the hardness (approx. 60 HV0.1) and strength (approx. 150 MPa) of the weld are lower, which is also related to the lower plasticity of this region of the joint. The strength (approx. 300 MPa) in some micro-areas is significantly higher than that of the overall joint (204 MPa). This is primarily attributable to the macroscopic sample also containing material in the as-cast state, i.e., unwrought. The microprobe therefore includes less potential crack nucleation mechanisms, such as microsegregations and microshrinkage.

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Plastic deformation mechanism and hardening mechanism of rolled Rare-Earth magnesium alloy thin sheet

Cited by 47 publications

References 37 publications

Quasi-In-Situ Analysis of As-Rolled Microstructure of Magnesium Alloys during Annealing and Subsequent Plastic Deformation

Quasi-In-Situ Analysis of As-Rolled Microstructure of Magnesium Alloys during Annealing and Subsequent Plastic Deformation

Finite Element Simulation and Experimental Study of U-Bending Forming of High-Strength Mg-Gd-Y-Zn-Zr Alloy

Comprehensive Research of FSW Joints of AZ91 Magnesium Alloy

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