HAL (Le Centre pour la Communication Scientifique Directe), Oct 9, 2022
As the population ages in modern societies and the risks of bone diseases or bone accidents incre... more As the population ages in modern societies and the risks of bone diseases or bone accidents increase, there is a need for a new generation of materials with superior biocompatibility and good mechanical properties. This study combines two innovative metallurgical concepts to provide a material solution for the intended application. To this end, multicomponent and complex concentrated alloy (HEA/CCAs) based on TiNbZr-X (X = Mo, Ta) system is fabricated via additive manufacturing (AM), namely by Laser-Powder Bed Fusion (L-PBF) of gas-atomized pre-alloyed powder. After each stage of development by L-PBF through Taguchi's design of experiments, complete microstructure characterization and mechanical behavior of the resulting samples under different loading conditions are conducted. In addition, mechanical surface functionalization carried out by machining with metrological monitoring as a pre-step before a chemical functionalization for the suitability of materials developed for the intended application.
Additive manufactured Ti6Al4V reinforced with nano yttria-zirconia (nYSZ) parts were fabricated u... more Additive manufactured Ti6Al4V reinforced with nano yttria-zirconia (nYSZ) parts were fabricated using selective laser melting technology (SLM). The as-received Ti6Al4V powder and two powder mixtures of Ti6Al4V mixed with several nYSZ contents (1wt% and 2.5wt%) were prepared and then SLM processed. Parts were further subjected to a stress relief heat treatment. Besides, hot isostatic pressure (HIP) was used in order to eliminate residual porosities. The pycnometer-based technique was used to measure the mass density. XRD and EBSD analysis were performed to investigate the influence of nYSZ additions on the microstructure and subsequent mechanical properties via microhardness and compression tests. It was found that addition of nYSZ increases the density of the reinforced parts and produces a fine α martensite phase. Besides, the grain size was refined compared to that of heat treated Ti6Al4V. As a consequence, a significant increase in both the hardness and the compressive strength f...
Data related to spectrum analyzes for phases identification, microstructure and mechanical proper... more Data related to spectrum analyzes for phases identification, microstructure and mechanical properties of additive manufactured Ti6Al4V reinforced with nano Yttria stabilized zirconia, Data in Brief,
This study presents the results of selective laser melting (SLM) of Ti6Al4V reinforced with 1% an... more This study presents the results of selective laser melting (SLM) of Ti6Al4V reinforced with 1% and 2.5% (wt%) nano yttria-stabilized zirconia (nYSZ). The bulk parts showed a very high building density which means that the melting parameters were optimal. X-ray diffraction analysis confirmed the existence of a near-alpha microstructure. No change in grains shape was noticed after the addition of nYSZ, columnar and lamellar grains remained present. The microhardness of Ti6Al4V was greatly enhanced from 340 HV to 511 HV after the addition of nYSZ which is the highest recorded value so far. The maximum values of yield stress and compressive strengths were 1302 MPa and 1751 MPa, respectively, compared to 840 MPa and 1250 MPa, respectively, for the SLMed Ti6Al4V.
Cette étude a présenté pour la première fois l'effet de l'ajout de poudre de zircone stab... more Cette étude a présenté pour la première fois l'effet de l'ajout de poudre de zircone stabilisée par l’oxyde d’yttrium (nYSZ) sur la microstructure et les propriétés mécaniques à chaud et à froid du Ti6Al4V fabriqué via la technologie fusion sur lit de poudre (SLM). Cette thèse contient également la première étude de l'effet du pressage isostatique à chaud (HIP) sur une matrice Ti6Al4V renforcée par la zircone et fabriquée par SLM. La fusion des mélanges de poudre Ti6Al4V / nYSZ via SLM peut être difficile si les paramètres de fusion ne sont pas adaptés. À l'exception du raffinage des grains, la microstructure de Ti6Al4V ne présente pas de changements significatifs dans la morphologie des grains après l'addition de nYSZ. Cependant, les propriétés mécaniques ont été considérablement augmentées. Après le post-traitement HIP, le nombre de défauts est drastiquement réduit et les propriétés mécaniques améliorées. Le matériau présente par ailleurs une contrainte d'é...
HAL (Le Centre pour la Communication Scientifique Directe), Oct 9, 2022
As the population ages in modern societies and the risks of bone diseases or bone accidents incre... more As the population ages in modern societies and the risks of bone diseases or bone accidents increase, there is a need for a new generation of materials with superior biocompatibility and good mechanical properties. This study combines two innovative metallurgical concepts to provide a material solution for the intended application. To this end, multicomponent and complex concentrated alloy (HEA/CCAs) based on TiNbZr-X (X = Mo, Ta) system is fabricated via additive manufacturing (AM), namely by Laser-Powder Bed Fusion (L-PBF) of gas-atomized pre-alloyed powder. After each stage of development by L-PBF through Taguchi's design of experiments, complete microstructure characterization and mechanical behavior of the resulting samples under different loading conditions are conducted. In addition, mechanical surface functionalization carried out by machining with metrological monitoring as a pre-step before a chemical functionalization for the suitability of materials developed for the intended application.
Additive manufactured Ti6Al4V reinforced with nano yttria-zirconia (nYSZ) parts were fabricated u... more Additive manufactured Ti6Al4V reinforced with nano yttria-zirconia (nYSZ) parts were fabricated using selective laser melting technology (SLM). The as-received Ti6Al4V powder and two powder mixtures of Ti6Al4V mixed with several nYSZ contents (1wt% and 2.5wt%) were prepared and then SLM processed. Parts were further subjected to a stress relief heat treatment. Besides, hot isostatic pressure (HIP) was used in order to eliminate residual porosities. The pycnometer-based technique was used to measure the mass density. XRD and EBSD analysis were performed to investigate the influence of nYSZ additions on the microstructure and subsequent mechanical properties via microhardness and compression tests. It was found that addition of nYSZ increases the density of the reinforced parts and produces a fine α martensite phase. Besides, the grain size was refined compared to that of heat treated Ti6Al4V. As a consequence, a significant increase in both the hardness and the compressive strength f...
Data related to spectrum analyzes for phases identification, microstructure and mechanical proper... more Data related to spectrum analyzes for phases identification, microstructure and mechanical properties of additive manufactured Ti6Al4V reinforced with nano Yttria stabilized zirconia, Data in Brief,
This study presents the results of selective laser melting (SLM) of Ti6Al4V reinforced with 1% an... more This study presents the results of selective laser melting (SLM) of Ti6Al4V reinforced with 1% and 2.5% (wt%) nano yttria-stabilized zirconia (nYSZ). The bulk parts showed a very high building density which means that the melting parameters were optimal. X-ray diffraction analysis confirmed the existence of a near-alpha microstructure. No change in grains shape was noticed after the addition of nYSZ, columnar and lamellar grains remained present. The microhardness of Ti6Al4V was greatly enhanced from 340 HV to 511 HV after the addition of nYSZ which is the highest recorded value so far. The maximum values of yield stress and compressive strengths were 1302 MPa and 1751 MPa, respectively, compared to 840 MPa and 1250 MPa, respectively, for the SLMed Ti6Al4V.
Cette étude a présenté pour la première fois l'effet de l'ajout de poudre de zircone stab... more Cette étude a présenté pour la première fois l'effet de l'ajout de poudre de zircone stabilisée par l’oxyde d’yttrium (nYSZ) sur la microstructure et les propriétés mécaniques à chaud et à froid du Ti6Al4V fabriqué via la technologie fusion sur lit de poudre (SLM). Cette thèse contient également la première étude de l'effet du pressage isostatique à chaud (HIP) sur une matrice Ti6Al4V renforcée par la zircone et fabriquée par SLM. La fusion des mélanges de poudre Ti6Al4V / nYSZ via SLM peut être difficile si les paramètres de fusion ne sont pas adaptés. À l'exception du raffinage des grains, la microstructure de Ti6Al4V ne présente pas de changements significatifs dans la morphologie des grains après l'addition de nYSZ. Cependant, les propriétés mécaniques ont été considérablement augmentées. Après le post-traitement HIP, le nombre de défauts est drastiquement réduit et les propriétés mécaniques améliorées. Le matériau présente par ailleurs une contrainte d'é...
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