The Experts below are selected from a list of 2103 Experts worldwide ranked by ideXlab platform
X Boulnat - One of the best experts on this subject based on the ideXlab platform.
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modeling of interstitials diffusion during debinding sintering of 3d printed metallic filaments application to Titanium alloy and its embrittlement
Acta Materialia, 2021Co-Authors: M Coffigniez, Laurent Gremillard, Michel Perez, S Simon, C Rigollet, E Bonjour, P Jame, X BoulnatAbstract:Abstract Parts made by metal additive manufacturing processes assisted by sintering suffer from embrittlement due to binder/powders interactions. Using a core-shell approach, we modelled the diffusion of carbon and oxygen from the binder into the metallic powders. The model was assessed by measuring the interstitials content upon various debinding/sintering steps. The diffusion/precipitation phenomena during these non-isothermal treatments lead to either a saturated solid solution or the precipitation of Titanium Carbides. The consequences on the mechanical behavior of single 3D printed filaments were quantified by bending tests, highlighting a transition from brittle to ductile fracture depending on the debinding parameters. This approach can be applied to understand the role of fast diffusing interstitial elements into various powders systems in order to optimise the chemical composition and the mechanical properties of 3D printed metallic parts.
Vadym N Borysiuk - One of the best experts on this subject based on the ideXlab platform.
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molecular dynamic study of the mechanical properties of two dimensional Titanium Carbides ti n 1 c n mxenes
Nanotechnology, 2015Co-Authors: Vadym N Borysiuk, Vadym Mochalin, Yury GogotsiAbstract:Two-dimensional materials beyond graphene are attracting much attention. Recently discovered 2D Carbides and nitrides (MXenes) have shown very attractive electrical and electrochemical properties, but their mechanical properties have not been characterized yet. There are neither experimental measurements reported in the literature nor predictions of strength or fracture modes for single-layer MXenes. The mechanical properties of two-dimensional Titanium Carbides were investigated in this study using classical molecular dynamics. Young's modulus was calculated from the linear part of strain-stress curves obtained under tensile deformation of the samples. Strain-rate effects were observed for all Tin+1Cn samples. From the radial distribution function, it is found that the structure of the simulated samples is preserved during the deformation process. Calculated values of the elastic constants are in good agreement with published DFT data.
Robert G Odonnell - One of the best experts on this subject based on the ideXlab platform.
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in situ precipitation of tic upon pta hardfacing with grey cast iron and Titanium for enhanced wear resistance
Surface & Coatings Technology, 2013Co-Authors: Santiago Corujeira Gallo, Nazmul Alam, Robert G OdonnellAbstract:Titanium and grey cast iron powders were blended and deposited by plasma transferred arc onto mild steel substrates. The powders were injected directly into the arc by a stream of inert gas. The grey cast iron provided the iron matrix and the excess carbon content for reaction and precipitation of Titanium Carbides. The microstructure of the overlay was analysed by optical microscopy and scanning electron microscopy, and the respective phases were identified by X-ray diffraction. Microhardness measurements were taken from representative areas and the wear behaviour was assessed under low-stress abrasion conditions. The results show that the addition of Titanium produced a significant change in the microstructure of the overlays, increased surface hardness and enhanced wear resistance compared to overlays produced without Titanium.
M Coffigniez - One of the best experts on this subject based on the ideXlab platform.
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modeling of interstitials diffusion during debinding sintering of 3d printed metallic filaments application to Titanium alloy and its embrittlement
Acta Materialia, 2021Co-Authors: M Coffigniez, Laurent Gremillard, Michel Perez, S Simon, C Rigollet, E Bonjour, P Jame, X BoulnatAbstract:Abstract Parts made by metal additive manufacturing processes assisted by sintering suffer from embrittlement due to binder/powders interactions. Using a core-shell approach, we modelled the diffusion of carbon and oxygen from the binder into the metallic powders. The model was assessed by measuring the interstitials content upon various debinding/sintering steps. The diffusion/precipitation phenomena during these non-isothermal treatments lead to either a saturated solid solution or the precipitation of Titanium Carbides. The consequences on the mechanical behavior of single 3D printed filaments were quantified by bending tests, highlighting a transition from brittle to ductile fracture depending on the debinding parameters. This approach can be applied to understand the role of fast diffusing interstitial elements into various powders systems in order to optimise the chemical composition and the mechanical properties of 3D printed metallic parts.
Yury Gogotsi - One of the best experts on this subject based on the ideXlab platform.
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molecular dynamic study of the mechanical properties of two dimensional Titanium Carbides ti n 1 c n mxenes
Nanotechnology, 2015Co-Authors: Vadym N Borysiuk, Vadym Mochalin, Yury GogotsiAbstract:Two-dimensional materials beyond graphene are attracting much attention. Recently discovered 2D Carbides and nitrides (MXenes) have shown very attractive electrical and electrochemical properties, but their mechanical properties have not been characterized yet. There are neither experimental measurements reported in the literature nor predictions of strength or fracture modes for single-layer MXenes. The mechanical properties of two-dimensional Titanium Carbides were investigated in this study using classical molecular dynamics. Young's modulus was calculated from the linear part of strain-stress curves obtained under tensile deformation of the samples. Strain-rate effects were observed for all Tin+1Cn samples. From the radial distribution function, it is found that the structure of the simulated samples is preserved during the deformation process. Calculated values of the elastic constants are in good agreement with published DFT data.