Intergranular Cracking in Mg-Gd-Y Alloy during Tension Test

Liu, Jianhua; Sun, Jie; Chen, Qingqiang; Lu, Laixiao

doi:10.3390/cryst12081040

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…Gao et al [23] adopted in situ tensile experiments combined with SEM, EBSD and digital image correlation (DIC) and pointed out that the fracture mechanism of the material changed from ductile transgranular fracture to brittle intergranular-transgranular mixed fracture with the increase in grain size. Liu et al [24] used in situ SEM combined with EBSD and DIC to show that the crack occurs at the triangular point during alloy fracture and spreads along the grain boundary to generate an intergranular crack. In this study, we utilized in situ SEM, coupled with EBSD and other technologies, to analyse the entire fracture process of materials.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Three Constitutive Models and Microstructure Characteristics of Nb521 during Hot Deformation

et al. 2023

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This study presents an exploration of the flow stress constitutive model and the deformation mechanism of Nb521, both critical for its practical application. Hot-compression experiments were performed on Nb521 at temperatures ranging from 1523 K to 1723 K and strain rates ranging from 0.01 to 10 s−1. In addition, the microstructure evolution was concurrently studied through scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD). The stress–strain behaviour of Nb521 was assessed, leading to the development of three constitutive models: the Johnson–Cook model, the modified Johnson–Cook model and the Arrhenius model. In the course of the deformation process, it is consistently observed that the hardening effect surpasses the softening effect during the plastic phase, with no observable occurrence of a steady-state phase. The modified Johnson–Cook model offers superior predictive accuracy. Both grain elongation and torsion are the main deformation mechanisms of Nb521 and specific texture forms during stretching. This study also reveals that fractures at both room temperature and high temperatures are brittle in nature. The elucidation of the constitutive model and underlying deformation mechanisms in this study offers indispensable insights into the hot-deformation behaviour of Nb521.

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Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Three Constitutive Models and Microstructure Characteristics of Nb521 during Hot Deformation

et al. 2023

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“…The application of magnesium alloys is always a research hot spot. Magnesium alloys have a wide range of use in the automotive manufacturing, aerospace, 3C electronics, rail transportation and biomedical fields [4][5][6]. On the one hand, magnesium alloys can meet the performance requirements in practical applications; on the other hand, they are a lightweight material [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Structural, Tensile Properties and Electronic of Mg–X (X = Zn, Ag) Alloys by the First-Principles Method

Gao

Feng

et al. 2023

Crystals

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In order to study the strengthening effect of Mg–X (X = Zn, Ag) alloys, solid solution structures of Mg54, Mg53X1 and Mg52X2 (X = Zn, Ag) with atomic contents of 1.8 at.% and 3.7 at.% were established, respectively. The structural stability, tensile properties and electronic properties were investigated by first-principles simulation. The calculated results of cohesive energies show that all solid solution structures were stable under different tensile strains, and Mg52Ag2 had the best stability. The results of tensile tests show that Zn and Ag atoms promoted the Mg-based alloy’s yield strength and tensile strength. In addition, through comparative analyses, we have demonstrated that the tensile property of Mg-based alloys was also affected by solid solubility. Finally, the electronic density of states (DOS) and electron density difference of several solid solution structures were analyzed.

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“…They proposed that the ductility of such materials can be significantly improved by the initial yielding of the components to increase the local misorientation index in medium strain regimes. In high-strain regimes of the same material class, Liu et al [3] investigated the local strain heterogeneity using electron backscattered diffraction (EBSD) measurement and digital image correlation (DIC) analysis of miniature tensile test samples. They showed that damage initiation occurs at triple points of the grains with highly contrasting Schmidt factors.…”

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confidence: 99%