Tearing Toughness of Ductile Metals

Li, Cui-Hong; Duan, Qingling; Zhang, Zhefeng

doi:10.1007/s40195-016-0371-8

Cited by 8 publications

(6 citation statements)

References 32 publications

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“…The increase in impact strength observed in the impact tensile tests indicates that the material tested under the load conditions applied along the elongated grains behaves like ultra-fine material, where an increase in impact strength was observed with a simultaneous increase in strength. Similar effects were observed in CuAl alloys after the cold rolling process [39,40] and after the ECAP process [41,42]. Under the conditions of impact load applied transversely to the direction of grain elongation, with a clear decrease in impact strength, changes characteristic of coarse-grained materials are observed and strength is accompanied by a decrease in impact strength.…”

Section: Mechanical Propertiessupporting

confidence: 71%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Przybysz,

Kulczyk,

Skiba

et al. 2022

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The methods of severe plastic deformation (SPD) of metals and metal alloys are very attractive due to the possibility of refinement of the grains to nanometric sizes, which facilitates obtaining high mechanical properties. This study investigated the influence of SPD in the process of hydrostatic extrusion (HE) on the anisotropy of the mechanical properties of the CuCrZr copper alloy. The method of HE leads to the formation of a characteristic microstructure in deformed materials, which can determine their potential applications. On the longitudinal sections of the extruded bars, a strong morphological texture is observed, manifested by elongated grains in the direction of extrusion. In the transverse direction, these grains are visible as equiaxed. The anisotropy of properties was mainly determined based on the analysis of the static mini-sample static tensile test and the dynamic impact test. The obtained results were correlated with microstructural observations. In the study, three different degrees of deformation were applied at the level necessary to refine the grain size to the ultrafine-grained level. Regardless of the applied degree of deformation, the effect of the formation of a strong morphological texture was demonstrated, as a result of which there is a clear difference between the mechanical properties depending on the test direction, both by the static and dynamic method. The obtained results allow for the identification of the characteristic structure formed during the HE process and the more effective use of the CuCrZr copper alloy in applications.

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Section: Mechanical Propertiessupporting

confidence: 71%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Przybysz,

Kulczyk,

Skiba

et al. 2022

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“…The yield strength and limited plastic strain of BMGs can reflect the toughness [13]. The relationships between the surface feature and toughness of BMGs are supplied in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Effect of Laser Shock Peening on the Surface Morphology of Metallic Glasses

Zhang

Duan

et al. 2017

MSF

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Laser shock peening is a promising effective approach for improving mechanical properties of metallic glass. In this work, laser shock peening was employed to study the surface morphologies of metallic glasses with different toughness. Numerous localized circular-or arc-shaped structures, with the size of 5~20 μm, were observed in the shock treated surface. The number of these unique localized structures has a close correlation to the ability of metallic glass to accommodate plastic deformation. In addition, the surface morphology evolution of Zr-based metallic glasses with different crystalline degrees is also discussed, indicating that the circular-or arc-shaped structures only appear in fully amorphous system.

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“…Based on the definition of HEAs, the opportunities for the atoms to occupy the lattice sites should be close [1][2][3][4][5][6][7][8], which is not easy to be realized when the atomic size difference is too large. Moreover, serious lattice distortion and drastic increase in the alloy system energy is brought about along with a large atomic size difference.…”

Section: Atomic Size Difference Of All Elementsmentioning

confidence: 99%

“…High-entropy alloys (HEAs), as a new alloy design concept, were proposed by Ye et al [1] in 2004 and have attracted much attention owing to their unique phase formation ability [2][3][4][5][6]. According to the definition [7,8], HEAs typically consist of at least five major elements with the atomic percentage between 5 and 35%.…”

Section: Introductionmentioning

confidence: 99%

Designing Rules of Laser-Clad High-Entropy Alloy Coatings with Simple Solid Solution Phases

Juan

Zhang

Dai

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The criteria of process parameters (µ ≤ 4), atomic size difference (ε ≤ 5.8, δ ≤ 11 and α ≤ 2), thermodynamic (− 14.5 ≤ ∆H mix ≤ 6.5 and Ω ≥ 1.8) in the prediction of the phase stability for laser-clad high-entropy alloy coatings are studied in detail. Besides, the criteria of valence electron concentration (VEC) applied to distinguish the stability of different solid solution phases are as follows: VEC < 7.65 for simple BCC, VEC ≥ 7.65 for simple face-centered cubic (FCC), 7.14 < VEC < 7.78 for dual-phase BCC and FCC. Among them, µ and ε proposed firstly separate the phase stability of laserclad high-entropy alloy coatings quite precisely. The other modified criteria (δ, α, ∆H mix , Ω, VEC) are proved to be different from those of the high-entropy alloys synthesized by the traditional casting and smelting processes.

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Tearing Toughness of Ductile Metals

Cited by 8 publications

References 32 publications

Bulletin of the Polish Academy of Sciences: Technical Sciences

Bulletin of the Polish Academy of Sciences: Technical Sciences

Effect of Laser Shock Peening on the Surface Morphology of Metallic Glasses

Designing Rules of Laser-Clad High-Entropy Alloy Coatings with Simple Solid Solution Phases

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