TY  - JOUR
AU  - Zhao, Senlin
AU  - Xin, Dongqun
AU  - Chen, Xizhang
AU  - Stašić, Jelena
AU  - Trtica, Milan
AU  - Siddiquee, Arshad Noor
AU  - Mohan, Sanjay
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10292
AB  - AlCoxCrFeNi (x = 2.2, 2.8) high entropy alloys (HEAs) were successfully prepared by multi-layer and multi-channel laser melting deposition (LMD). The tensile properties of the LMD-fabricated AlCoxCrFeNi HEAs were investigated. The phase evolution of these alloys was examined by X-ray diffraction and compared with existing models. The microstructure of the alloys was characterized using scanning electron microscopy and electron backscatter diffraction. It is found that Co element can promote the phase transformation from BCC phase to FCC phase in the as-deposited AlCoxCrFeNi HEAs, and the volume fraction of FCC phase increases from 51.4% to 74.6% as the Co content increases from 36.2 at% to 40.8 at%. With the increase of Co content, the grain size of BCC phase in the alloys decreases and a larger amount of fine needle-like BCC phase appears in the FCC matrix. Tensile testing shows that higher Co content in the deposited AlCoxCrFeNi alloy can enhance its plasticity without significantly compromising its ultimate strength. As the Co content increases, the fracture strain increases from 5.9% to 15.4%, while the yield strength reduces from 450 MPa to 360 MPa and the ultimate tensile strength increases from 734 MPa to 739 MPa. The variations in tensile properties of the AlCoxCrFeNi alloy result from phase structure changes and microstructure evolution. Through this research, it is demonstrated that enhancement of the tensile properties of the LMD-fabricated AlCoCrFeNi HEAs can be realized by increasing the content of Co element.
T2  - Journal of Alloys and Compounds
T1  - Microstructure and enhanced tensile properties of AlCoxCrFeNi high entropy alloys with high Co content fabricated by laser melting deposition
VL  - 917
SP  - 165403
DO  - 10.1016/j.jallcom.2022.165403
ER  - 

@article{
author = "Zhao, Senlin and Xin, Dongqun and Chen, Xizhang and Stašić, Jelena and Trtica, Milan and Siddiquee, Arshad Noor and Mohan, Sanjay",
year = "2022",
abstract = "AlCoxCrFeNi (x = 2.2, 2.8) high entropy alloys (HEAs) were successfully prepared by multi-layer and multi-channel laser melting deposition (LMD). The tensile properties of the LMD-fabricated AlCoxCrFeNi HEAs were investigated. The phase evolution of these alloys was examined by X-ray diffraction and compared with existing models. The microstructure of the alloys was characterized using scanning electron microscopy and electron backscatter diffraction. It is found that Co element can promote the phase transformation from BCC phase to FCC phase in the as-deposited AlCoxCrFeNi HEAs, and the volume fraction of FCC phase increases from 51.4% to 74.6% as the Co content increases from 36.2 at% to 40.8 at%. With the increase of Co content, the grain size of BCC phase in the alloys decreases and a larger amount of fine needle-like BCC phase appears in the FCC matrix. Tensile testing shows that higher Co content in the deposited AlCoxCrFeNi alloy can enhance its plasticity without significantly compromising its ultimate strength. As the Co content increases, the fracture strain increases from 5.9% to 15.4%, while the yield strength reduces from 450 MPa to 360 MPa and the ultimate tensile strength increases from 734 MPa to 739 MPa. The variations in tensile properties of the AlCoxCrFeNi alloy result from phase structure changes and microstructure evolution. Through this research, it is demonstrated that enhancement of the tensile properties of the LMD-fabricated AlCoCrFeNi HEAs can be realized by increasing the content of Co element.",
journal = "Journal of Alloys and Compounds",
title = "Microstructure and enhanced tensile properties of AlCoxCrFeNi high entropy alloys with high Co content fabricated by laser melting deposition",
volume = "917",
pages = "165403",
doi = "10.1016/j.jallcom.2022.165403"
}

Zhao, S., Xin, D., Chen, X., Stašić, J., Trtica, M., Siddiquee, A. N.,& Mohan, S.. (2022). Microstructure and enhanced tensile properties of AlCoxCrFeNi high entropy alloys with high Co content fabricated by laser melting deposition. in Journal of Alloys and Compounds, 917, 165403.
https://doi.org/10.1016/j.jallcom.2022.165403

Zhao S, Xin D, Chen X, Stašić J, Trtica M, Siddiquee AN, Mohan S. Microstructure and enhanced tensile properties of AlCoxCrFeNi high entropy alloys with high Co content fabricated by laser melting deposition. in Journal of Alloys and Compounds. 2022;917:165403.
doi:10.1016/j.jallcom.2022.165403 .

Zhao, Senlin, Xin, Dongqun, Chen, Xizhang, Stašić, Jelena, Trtica, Milan, Siddiquee, Arshad Noor, Mohan, Sanjay, "Microstructure and enhanced tensile properties of AlCoxCrFeNi high entropy alloys with high Co content fabricated by laser melting deposition" in Journal of Alloys and Compounds, 917 (2022):165403,
https://doi.org/10.1016/j.jallcom.2022.165403 . .

TY  - JOUR
AU  - Konovalov, Sergey
AU  - Chen, Xizhang
AU  - Sarychev, Vladimir
AU  - Nevskii, Sergey
AU  - Gromov, Victor
AU  - Trtica, Milan
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1463
AB  - Numerous processes take place in materials under the action of concentrated energy flows. The most important ones include heating together with the temperature misdistribution throughout the depth, probable vaporization on the surface layer, melting to a definite depth, and hydrodynamic flotation; generation of thermo-elastic waves; dissolution of heterogeneous matrix particles; and formation of nanolayers. The heat-based model is presented in an enthalpy statement involving changes in the boundary conditions, which makes it possible to consider melting and vaporization on the material surface. As a result, a linear dependence of penetration depth vs. energy density has been derived. The model of thermo-elastic wave generation is based on the system of equations on the uncoupled one-dimensional problem of dynamic thermo-elasticity for a layer with the finite thickness. This problem was solved analytically by the symbolic method. It has been revealed for the first time that the generated stress pulse comprises tension and compression zones, which are caused by increases and decreases in temperature on the boundary. The dissolution of alloying elements is modeled on the example of a titanium-carbon system in the process of electron beam action. The mathematical model is proposed to describe it, and a procedure is suggested to solve the problem of carbon distribution in titanium carbide and liquid titanium-carbide solution in terms of the state diagram and temperature changes caused by phase transitions. Carbon concentration vs. spatial values were calculated for various points of time at diverse initial temperatures of the cell. The dependence of carbon particle dissolution on initial temperature and radius of the particle were derived. A hydrodynamic model based on the evolution of Kelvin-Helmholtz instability in shear viscous flows has been proposed to specify the formation of nanostructures in materials subjected to the action of concentrated energy flows. It has been pointed out for the first time that, for certain parameters of the problem, that there are two micro-and nanoscale peaks in the relation of the decrement to the wavelength of the interface disturbance.
T2  - Metals
T1  - Mathematical Modeling of the Concentrated Energy Flow Effect on Metallic Materials
VL  - 7
IS  - 1
DO  - 10.3390/met7010004
ER  - 

@article{
author = "Konovalov, Sergey and Chen, Xizhang and Sarychev, Vladimir and Nevskii, Sergey and Gromov, Victor and Trtica, Milan",
year = "2017",
abstract = "Numerous processes take place in materials under the action of concentrated energy flows. The most important ones include heating together with the temperature misdistribution throughout the depth, probable vaporization on the surface layer, melting to a definite depth, and hydrodynamic flotation; generation of thermo-elastic waves; dissolution of heterogeneous matrix particles; and formation of nanolayers. The heat-based model is presented in an enthalpy statement involving changes in the boundary conditions, which makes it possible to consider melting and vaporization on the material surface. As a result, a linear dependence of penetration depth vs. energy density has been derived. The model of thermo-elastic wave generation is based on the system of equations on the uncoupled one-dimensional problem of dynamic thermo-elasticity for a layer with the finite thickness. This problem was solved analytically by the symbolic method. It has been revealed for the first time that the generated stress pulse comprises tension and compression zones, which are caused by increases and decreases in temperature on the boundary. The dissolution of alloying elements is modeled on the example of a titanium-carbon system in the process of electron beam action. The mathematical model is proposed to describe it, and a procedure is suggested to solve the problem of carbon distribution in titanium carbide and liquid titanium-carbide solution in terms of the state diagram and temperature changes caused by phase transitions. Carbon concentration vs. spatial values were calculated for various points of time at diverse initial temperatures of the cell. The dependence of carbon particle dissolution on initial temperature and radius of the particle were derived. A hydrodynamic model based on the evolution of Kelvin-Helmholtz instability in shear viscous flows has been proposed to specify the formation of nanostructures in materials subjected to the action of concentrated energy flows. It has been pointed out for the first time that, for certain parameters of the problem, that there are two micro-and nanoscale peaks in the relation of the decrement to the wavelength of the interface disturbance.",
journal = "Metals",
title = "Mathematical Modeling of the Concentrated Energy Flow Effect on Metallic Materials",
volume = "7",
number = "1",
doi = "10.3390/met7010004"
}

Konovalov, S., Chen, X., Sarychev, V., Nevskii, S., Gromov, V.,& Trtica, M.. (2017). Mathematical Modeling of the Concentrated Energy Flow Effect on Metallic Materials. in Metals, 7(1).
https://doi.org/10.3390/met7010004

Konovalov S, Chen X, Sarychev V, Nevskii S, Gromov V, Trtica M. Mathematical Modeling of the Concentrated Energy Flow Effect on Metallic Materials. in Metals. 2017;7(1).
doi:10.3390/met7010004 .

Konovalov, Sergey, Chen, Xizhang, Sarychev, Vladimir, Nevskii, Sergey, Gromov, Victor, Trtica, Milan, "Mathematical Modeling of the Concentrated Energy Flow Effect on Metallic Materials" in Metals, 7, no. 1 (2017),
https://doi.org/10.3390/met7010004 . .