Effect of grain size on the microstructure and deformation mechanism of Mg-2Y-0.6Nd-0.6Zr alloy at a high strain rate

Li, Aiwen; Li, Wei; Luo, Min; Yu, Hongmin; Sun, Yidan; Liang, Yilong

doi:10.1016/j.msea.2021.141774

Cited by 14 publications

(3 citation statements)

References 30 publications

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“…With grain refinement, the deformation mechanism changes from tensile twinning and <a> dislocation slip to <a> dislocation and <c + a> dislocation slip. Figure 28 shows the distribution of different dislocations [147]. Zhu and Langdon also showed that the deformation mechanism under low stress and strain is mainly grain boundary sliding and diffusion creep, while the deformation mechanism under medium and high stress and strain is mainly the slip and climbing of intragranular dislocations.…”

Section: Deformation Mechanismmentioning

confidence: 98%

Recent Advances in the Equal Channel Angular Pressing of Metallic Materials

et al. 2022

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Applications of a metallic material highly depend on its mechanical properties, which greatly depend on the material’s grain sizes. Reducing grain sizes by severe plastic deformation is one of the efficient approaches to enhance the mechanical properties of a metallic material. In this paper, severe plastic deformation of equal channel angular pressing (ECAP) will be reviewed to illustrate its effects on the grain refinement of some common metallic materials such as titanium alloys, aluminum alloys, and magnesium alloys. In the ECAP process, the materials can be processed severely and repeatedly in a designed ECAP mold to accumulate a large amount of plastic strain. Ultrafine grains with diameters of submicron meters or even nanometers can be achieved through severe plastic deformation of the ECAP. In detail, this paper will give state-of-the-art details about the influences of ECAP processing parameters such as passes, temperature, and routes on the evolution of the microstructure of metallic materials. The evolution of grain sizes, grain boundaries, and phases of different metallic materials during the ECAP process are also analyzed. Besides, the plastic deformation mechanism during the ECAP process is discussed from the perspectives of dislocation slipping and twinning.

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Section: Deformation Mechanismmentioning

confidence: 98%

Recent Advances in the Equal Channel Angular Pressing of Metallic Materials

et al. 2022

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“…However, the application of Mg alloy components strictly requires various strain rates under some circumstances [2,3]. In addition to static deformation, Mg products are usually subjected to high-speed impact loads (i.e., shock and collision) [4,5]. Such high-speed deformation of Mg alloys generally leads to unpredictable serious failure in a short time [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of 1wt%Zn Addition on Microstructure and Mechanical Properties of Mg-6Er Alloys under High Strain Rates

Ren²,

Kang³

et al. 2022

Metals

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In this study, we investigated the high strain rate response of Mg-6wt%Er alloys with 1wt%Zn addition by split Hopkinson pressure bar (SHPB) tests in a range of 900–2500 s−1. Their related microstructures were also characterized by optical microscopy (OM), scanning electron microscopy (SEM), electron back-scattering diffraction (EBSD), and transmission electron microscopy (TEM). In particular, the twinning and stacking faults (SFs) in Mg-6Er and Mg-6Er-1Zn alloys are characterized, and the interactions between twin/SFs and dislocations are analyzed in detail. Compared with twins, the dispersed and dense SFs seem to more readily interact with dislocations, resulting in the enhancement of the strength of alloys. Especially at a high strain rate of 1450 s−1, dislocations are prone to tangle around the twins and SFs, forming low-angle grain boundaries (LAGBs). The addition of Zn in Mg-6Er can make LAGBs more easily transform into high-angle grain boundaries (HAGBs) due to the existence of SFs.

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“…They further evaluated that the non-basal plane < c + a > slip is the main deformation mechanism of the fine-grain magnesium alloys. Li et al [14] studied the compression deformation mechanism of Mg-2Y-0.6Nd-0.6Zr alloys with different grain sizes. The results showed that the accumulation of < c + a > dislocations was easier in fine grains.…”

Section: Introductionmentioning

confidence: 99%

Dynamic compression behaviour and constitutive description of fine-grain Mg–4Zn–1Y alloy

Liu

Mao

et al. 2022

Materials Science and Technology

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In this research, the dynamic compression behaviour of 5 and 1.5 µm grain size samples of Mg–4Zn–1Y alloy was investigated by the split Hopkinson pressure bar at the strain rate of 1000–1700 s−1. The microstructure, texture evolution, and the deformation mechanisms of samples were characterised by electron backscattering diffraction. The result showed that the grain refinement caused tension twining, which resulted in the distinct true stress–strain curves with specific grain sizes. It was found that the pyramidal < c + a > and pyramidal <a > slips were the main deformation mechanisms of 5 and 1.5 µm samples under dynamic compression, respectively. The constitutive modelling of Mg–4Zn–1Y with different grain sizes was also developed by introducing the grain size adjustment parameters.

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Effect of grain size on the microstructure and deformation mechanism of Mg-2Y-0.6Nd-0.6Zr alloy at a high strain rate

Cited by 14 publications

References 30 publications

Recent Advances in the Equal Channel Angular Pressing of Metallic Materials

Recent Advances in the Equal Channel Angular Pressing of Metallic Materials

Effect of 1wt%Zn Addition on Microstructure and Mechanical Properties of Mg-6Er Alloys under High Strain Rates

Dynamic compression behaviour and constitutive description of fine-grain Mg–4Zn–1Y alloy

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