Tensile and Compressive Mechanical Properties of Polycrystalline Tungsten–Molybdenum Alloy

Hu, Yiqun; Xu, Jianfei; Zhang, Yuhang; Ding, Suhang; Xia, Re

doi:10.1002/pssa.202200288

Cited by 4 publications

(3 citation statements)

References 42 publications

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“…The calculation formula of the shear strain values is as follows. [ 46,47 ]

$$\eta_{i}^{\text{Mises}} = \sqrt{\eta_{y z}^{2} + \eta_{x z}^{2} + \eta_{x y}^{2} + \frac{\left(\left(\right. \left(\eta\right)_{y y} - \left(\eta\right)_{z z} \left.\right)\right)^{2} + \left(\left(\right.

…”

Section: Methodsmentioning

confidence: 99%

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Mechanical Properties of Cold‐Welded CoCrFeCuNi Nanowires with Side‐by‐Side Contact: A Molecular Dynamics Study

Liu

Zhang

et al. 2023

Physica Status Solidi (a)

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Cold welding at the nanoscale is a promising technique for bottom‐up fabrication and assembly of nanostructured materials. In this paper, we investigate the cold welding process of the CoCrFeCuNi high‐entropy alloy (HEA) nanowires in the form of side‐by‐side contact using molecular dynamics simulation. The effects of overlap length, crystal orientation, and temperature are taken into consideration. Our results demonstrate that strength is positively correlated with the overlap length. Fracture strain first increases up to a maximum and then decreases with the increase in overlap length. When the temperature increases from 300 K to 900 K, the ultimate stress of the welded nanowires decreases from 1.18 GPa to 0.87 GPa, and the welding stress decreases from ‐0.54 GPa to ‐0.26 GPa. The crystal orientation significantly influences the deformation mechanism. For samples welded by nanowires with the same crystal orientation, the primary deformation mechanisms are twinning and dislocation slip. However, for samples welded by nanowires with different crystal orientations, the deformation is primarily mediated by the grain boundary slip. Our research can enhance the understanding of the cold welding behavior for low‐dimensional materials and is hopeful to provide some valuable guidance for the bottom‐up fabrication and assembly of HEAs nanocomponents.This article is protected by copyright. All rights reserved.

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“…The calculation formula of the shear strain values is as follows. [ 46,47 ]

$$\eta_{i}^{\text{Mises}} = \sqrt{\eta_{y z}^{2} + \eta_{x z}^{2} + \eta_{x y}^{2} + \frac{\left(\left(\right. \left(\eta\right)_{y y} - \left(\eta\right)_{z z} \left.\right)\right)^{2} + \left(\left(\right.

…”

Section: Methodsmentioning

confidence: 99%

“…Temperature is another important environmental factor for cold welding. [17,18,21,46,51] In this section, the effect of temperature on the cold welding process and mechanical properties is investigated. Cold welding simulations are carried out at 300, 500, 700, and 900 K, covering a wide range of temperatures.…”

Section: Effects Of Temperaturementioning

confidence: 99%

Mechanical Properties of Cold‐Welded CoCrFeCuNi Nanowires with Side‐by‐Side Contact: A Molecular Dynamics Study

Liu

Zhang

et al. 2023

Physica Status Solidi (a)

Self Cite

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“…The initial size of the simulation box is 20 nm × 20 nm × 20 nm, the total number of atoms in the ASSN model is 661 842, the number of grains is 20, and the average grain size is about 9.1 nm. The relationship between the average grain size d and the number of grains N can be calculated by

N = 6 V (π d^{3})

, [ 12 ] and V is the volume of the model. Dig out a grain inside the ASSN to form an ASSN model with void (abbreviated as ASSN‐Void).…”

Section: Models and Methodsmentioning

confidence: 99%

Molecular Dynamics Study on Adding Tungsten‐Carbide Grains to 304 Stainless Steel Polycrystals

Dong,

Jiang

2023

Physica Status Solidi (b)

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The molecular dynamics method is conducted to study the mechanical properties and plastic deformation mechanism of composite materials ASSN‐WC with tungsten carbide (WC) grains added to 304 austenitic stainless steel nanopolycrystals (ASSN) during uniaxial tensile process. The results indicate that the overall strength of ASSN with void defect is decreased, and because of the larger shear model of WC crystal, the overall strength of ASSN‐WC material is improved, and its toughness is not significantly reduced. In the plastic deformation process, under low strain conditions, the main deformation mechanism inside polycrystals is dislocation slip. The slip of dislocations forms extended dislocations and stacking faults, which makes the grains deform. As the strain increases, the dislocation slip inside the grains becomes more intense, and deformation twins appear. The interaction between slip dislocations and grain boundaries makes the grain boundaries hinder the further deformation of the grains, and the strengthening effect on the local area of the material becomes more obvious. Meanwhile, in the process of strain increase, the WC grains do not rotate and deform. This can also effectively hinder the deformation of other grains on the adjacent edges and improve the stiffness of the composite material.

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Orientation Dependent Quasi-isentropic Tensile Behaviors of Body-Centered Cubic Tungsten Through Molecular Dynamics

Leng,

Li,

Liu

et al. 2024

Met. Mater. Int.

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Tensile and Compressive Mechanical Properties of Polycrystalline Tungsten–Molybdenum Alloy

Cited by 4 publications

References 42 publications

Mechanical Properties of Cold‐Welded CoCrFeCuNi Nanowires with Side‐by‐Side Contact: A Molecular Dynamics Study

Mechanical Properties of Cold‐Welded CoCrFeCuNi Nanowires with Side‐by‐Side Contact: A Molecular Dynamics Study

Molecular Dynamics Study on Adding Tungsten‐Carbide Grains to 304 Stainless Steel Polycrystals

Orientation Dependent Quasi-isentropic Tensile Behaviors of Body-Centered Cubic Tungsten Through Molecular Dynamics

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