133 research outputs found
Nanoengineering high-performance metallic thin films with large and tunable mechanical properties
No full textInternational audienceThe current trend toward miniaturization in devices components in key technologies such as micro-/nanoelectronics, energy production, sensors and wear protection requires the development of high-performance nanostructured films with superior mechanical properties. Especially, mutually excluding mechanical properties such as high yield strength and ductility need to be combined, but also high adhesion with the substrate and large fatigue resistance. In order to trigger microstructure-induced material properties, control of the micro-scale structure, atomic composition, average grain size, and layer/film thickness must be optimized based on nanoengineering design concepts. In addition, measuring the properties of thin films (thickness ≤1 m) requires the development of novel techniques capable to probe their mechanical behavior[1]. Here, I will present recent results for several class of advanced thin film materials including nanostructured metallic glasses (ZrCu, ZrCuAl…)[2-4] high entropy alloys (CoCuCrFeNi, Al/CoCuCrFeNi) and multilayers (fully amorphous, amorphous/crystalline, FCC/BCC)[5], highlighting how the control of micro-structure affect the and micro-scale mechanical behavior and enable ultimate mechanical properties. Special emphasis will also be dedicated to present several cutting-edge techniques used to extract the mechanical/electrical behavior at the micro- and nanometer scale, involving, in situ SEM nanoindentation, micro-pillar compression, and tensile test in situ TEM. Finally, I will present recent developments within LSPM, highlighting new research activities dealing with the synthesis of nanostructured metallic films and the development of a new platform for in situ SEM mechanical-electrical characterization.References [1] J. Ast, M. Ghidelli, K. Durst, M. Goeken, M. Sebastiani, A.M. Korsunsky, A review of experimental approaches to fracture toughness evaluation at the micro-scale, Mater. Design 173 (2019) 107762.[2] M. Ghidelli, A. Orekhov, A.L. Bassi, G. Terraneo, P. Djemia, G. Abadias, M. Nord, A. Béché, N. Gauquelin, J. Verbeeck, J.-P. Raskin, D. Schryvers, T. Pardoen, H. Idrissi, Novel class of nanostructured metallic glass films with superior and tunable mechanical properties, Acta Mater. 213 (2021) 116955.[3] C. Poltronieri, A. Brognara, F. Bignoli, S. Evertz, P. Djemia, D. Faurie, F. Challali, C. Li, L. Belliard, G. Dehm, J.P. Best, M. Ghidelli, Mechanical properties and thermal stability of ZrCuAlx thin film metallic glasses: Experiments and first-principle calculations, Acta Mater. 258 (2023) 119226.[4] A. Brognara, J.P. Best, P. Djemia, D. Faurie, G. Dehm, M. Ghidelli, Effect of composition and nanostructure on the mechanical properties and thermal stability of Zr100-xCux thin film metallic glasses, Mater. Design 219 (2022) 110752.[5] G. Wu, C. Liu, A. Brognara, M. Ghidelli, Y. Bao, S. Liu, X. Wu, W. Xia, H. Zhao, J. Rao, D. Ponge, V. Devulapalli, W. Lu, G. Dehm, D. Raabe, Z. Li, Symbiotic crystal-glass alloys via dynamic chemical partitioning, Mater. Today 51 (2021) 6-14
Boosting mechanical & electrical properties of metallic thin films through advanced nanoengineering design strategies
No full textInternational audienceNovel high-performance nanostructured films with superior mechanical/electrical properties are required for advanced applications such as micro-/nanoelectronics, energy production, sensors and wear protection. Especially, mutually excluding structural properties such as high strength and ductility need to be combined, but also low electrical resistance enabling reduction of energy losses. In order to trigger microstructure-induced material properties, control of the micro-scale porosity, atomic composition, average grain size, and layer/film thickness must be optimized based on nanoengineering design concepts. In addition, measuring the properties of thin films (thickness ~1 m) requires the development of novel techniques capable to probe their mechanical/electrical behavior. Here, I will present recent results for several class of advanced materials including nanostructured metallic glasses, high entropy alloys and multilayers, highlighting their micro-scale mechanical behavior[1, 2], while I will discuss the measurement of electrical properties across grain boundaries for Cu films[3, 4]. Special emphasis will also be dedicated to present several cutting-edge techniques used to extract the mechanical/electrical behavior at the micro- and nanometer scale, involving in-situ SEM micro-pillar compression, tensile test in-situ TEM, and in-situ SEM electrical resistivity measurements. Finally, I will present recent developments within LSPM, highlighting new research activities dealing with the synthesis of nanostructured metallic films and the development of a new platform for in situ SEM mechanical-electrical characterization.[1] M. Ghidelli et al., Acta Mater. 213 (2021) 116955.[2] G. Wu, C. Liu, A. Brognara, M. Ghidelli, Y. Bao, W. Lu, G. Dehm, D. Raabe, Z. Li, Mater. Today 51 (2021) 6-14.[3] H. Bishara, S. Lee, T. Brink, M. Ghidelli, G. Dehm, ACS Nano 15(10) (2021) 16607-16615.[4] H. Bishara, M. Ghidelli, G. Dehm, ACS Appl. Electron. Mater. 2(7) (2020) 2049-2056
Synthesis and micro- & nanoscale characterization of nanoengineered thin films with superior mechanical/electrical properties
No full textInternational audienceNovel high-performance nanostructured materials with superior mechanical and electrical properties are required for advanced applications such as micro-/nanoelectronics, energy production, sensors and wear protection. Especially, mutually excluding structural properties such as high strength and ductility need to be combined, but also low electrical resistance enabling reduction of energy losses. In order to trigger microstructure-induced material properties, control of the micro-scale porosity, atomic composition, average grain size, and layer/film thickness must be optimized based on nanoengineering design concepts. In addition, the need of probing locally the properties of bulk materials combined with the ongoing trend for miniaturization of micro electro mechanical systems (MEMS), microelectronic components and thin films require the development of novel techniques in order to acquire information about the local mechanical/electrical behavior.Here, I will present recent results for several class of advanced materials including nanostructured metallic glasses [1] and multilayer high entropy alloys [2], while discussing the local electrical properties across grain boundaries for bulk materials and thin films [3]. Special emphasis will also be dedicated to present several cutting-edge techniques used to extract the mechanical/electrical behavior at the micro- and nanometer scale, involving i.e. micro-scale tensile tests, in-situ SEM micro-pillar compression/splitting [4], tensile test in-situ TEM, and in-situ SEM electrical resistivity measurements [3]. Finally, I will show one example of applications with the development of a wirelessly rechargeable transparent heater for thermotherapy patch based on metallic glass films reporting excellent stretchability (70%) and low sheet resistance (~3 Ω/sq) [5].[1] M. Ghidelli et al., Novel class of nanostructured metallic glass films with superior and tunable mechanical properties, Acta Materialia, 213, 116955, 2021.[2] G. Wu, C. Liu, A. Brognara, M. Ghidelli, Y. Bao, S. Liu, X. Wu, W. Xia, H. Zhao, J. Rao, D. Ponge, V. Devulapalli, W. Lu, G. Dehm, D. Raabe, Z. Li, Symbiotic crystal-glass alloys via dynamic chemical partitioning, Materials Today, 2020 (accepted).[3] H. Bishara, S. Lee, T. Brink, M. Ghidelli, G. Dehm, Understanding grain boundary electrical resistivity in Cu: the effect of boundary structure, ACS Nano, 2020 (accepted).[4] J. Ast, M. Ghidelli, K. Durst, M. Göken, M. Sebastiani, A.M. Korsunsky, A review of experimental approaches to fracture toughness evaluation at the micro-scale, Materials & Design, 173, 107762 (2019).[5] S. Lee, H. S. An, S.-W. Kim, M. Ghidelli, A. Li Bassi, S.-Y. Lee, J.-U. Park, Transparent Supercapacitors and Electrodes Using Nanostructured Metallic Glass Films for Wirelessly Rechargeable Heat Patches, NanoLetters, 20(7), 4872-4881, 2020
Novel nanoengineered metallic thin films with superior mechanical/electrical properties
No full textInternational audienceNovel high-performance nanostructured materials with superior mechanical and electrical properties are required for advanced applications such as micro-/nanoelectronics, energy production, sensors and wear protection. Especially, mutually excluding structural properties such as high strength and ductility need to be combined, but also low electrical resistance enabling reduction of energy losses. In order to trigger microstructure-induced material properties, control of the micro-scale porosity, atomic composition, average grain size, and layer/film thickness must be optimized based on nanoengineering design concepts. In addition, the need of probing locally the properties of bulk materials combined with the ongoing trend for miniaturization of micro electro mechanical systems (MEMS), microelectronic components and thin films require the development of novel techniques in order to acquire information about the local mechanical/electrical behavior.Here, I will present recent results for several class of advanced materials including nanostructured metallic glasses [1] and multilayer high entropy alloys [2], while discussing the local electrical properties across grain boundaries for bulk materials and thin films [3]. Special emphasis will also be dedicated to present several cutting-edge techniques used to extract the mechanical/electrical behavior at the micro- and nanometer scale, involving i.e. micro-scale tensile tests, in-situ SEM micro-pillar compression/splitting [4], tensile test in-situ TEM, and in-situ SEM electrical resistivity measurements [3]. Finally, I will show one example of applications with the development of a wirelessly rechargeable transparent heater for thermotherapy patch based on metallic glass films reporting excellent stretchability (70%) and low sheet resistance (~3 Ω/sq) [5].[1] M. Ghidelli et al., Novel class of nanostructured metallic glass films with superior and tunable mechanical properties, Acta Materialia, 213, 116955, 2021.[2] G. Wu, C. Liu, A. Brognara, M. Ghidelli, Y. Bao, S. Liu, X. Wu, W. Xia, H. Zhao, J. Rao, D. Ponge, V. Devulapalli, W. Lu, G. Dehm, D. Raabe, Z. Li, Symbiotic crystal-glass alloys via dynamic chemical partitioning, Materials Today, 2020 (accepted).[3] H. Bishara, S. Lee, T. Brink, M. Ghidelli, G. Dehm, Understanding grain boundary electrical resistivity in Cu: the effect of boundary structure, ACS Nano, 2020 (accepted).[4] J. Ast, M. Ghidelli, K. Durst, M. Göken, M. Sebastiani, A.M. Korsunsky, A review of experimental approaches to fracture toughness evaluation at the micro-scale, Materials & Design, 173, 107762 (2019).[5] S. Lee, H. S. An, S.-W. Kim, M. Ghidelli, A. Li Bassi, S.-Y. Lee, J.-U. Park, Transparent Supercapacitors and Electrodes Using Nanostructured Metallic Glass Films for Wirelessly Rechargeable Heat Patches, NanoLetters, 20(7), 4872-4881, 2020
Tailoring compositional and microstructural heterogeneities in metallic glass and high entropy alloy thin films to achieve large and mutually exclusive mechanical properties
No full textInternational audienceThe current trend toward miniaturization in devices components in key technologies such as micro-/nanoelectronics, energy production, sensors and wear protection requires the development of high-performance nanostructured films with superior mechanical properties. Especially, mutually excluding mechanical properties such as high yield strength and ductility need to be combined, but also high adhesion with the substrate and large fatigue resistance. In order to trigger microstructure-induced material properties, control of the micro-scale structure, atomic composition, average grain size, and layer/film thickness must be optimized based on nanoengineering design concepts. Here, I will present recent results for several class of advanced thin film materials including nanostructured metallic glasses (ZrCu/O, ZrCuAl/O…)[1-3] high entropy alloys (CoCuCrFeNi, Al/CoCuCrFeNi) and nanolaminates (fully amorphous, amorphous/crystalline, FCC/BCC)[4, 5], highlighting how the control of micro-structure affect the and micro-scale mechanical behavior and enable ultimate mechanical properties.Among the main results, I will present the potential of Pulsed Laser Deposition (PLD)[1] as a novel technique to synthetize nanostructured cluster-assembled ZrCu, ZrCuAl/O, and CoCuCrFeNi films, reaching ultimate yield strength (>4 GPa) and ductility (>15 %) for ZrCuAl/O films. I will show how controlling of the sublayer thickness (from 100 down to 5 nm) in fully amorphous nanolaminates influences the deformation behavior, suppressing the shear bands formation, while tuning the mechanical properties with mutual combination of large ductility (>10%) and yields strength (>2.5 GPa)[5]. Additionally, I will discuss the synthesis of alternating CrCoNi (crystalline)/TiZrNbHf (amorphous) nanolayers results in an high yield strength (3.6 GPa) and homogeneous deformation (~15%)[4].Finally, I will present recent developments within LSPM, highlighting new research activities dealing with the synthesis of nanostructured metallic films and the development of a new platform for in situ SEM mechanical-electrical characterization.References [1] M. Ghidelli, A. Orekhov, A.L. Bassi, G. Terraneo, P. Djemia, G. Abadias, M. Nord, A. Béché, N. Gauquelin, J. Verbeeck, J.-P. Raskin, D. Schryvers, T. Pardoen, H. Idrissi, Novel class of nanostructured metallic glass films with superior and tunable mechanical properties, Acta Mater. 213 (2021) 116955 doi:10.1016/j.actamat.2021.116955.[2] C. Poltronieri, A. Brognara, F. Bignoli, S. Evertz, P. Djemia, D. Faurie, F. Challali, C. Li, L. Belliard, G. Dehm, J.P. Best, M. Ghidelli, Mechanical properties and thermal stability of ZrCuAlx thin film metallic glasses: Experiments and first-principle calculations, Acta Mater. 258 (2023) 119226 doi:10.1016/j.actamat.2023.119226.[3] A. Brognara, J.P. Best, P. Djemia, D. Faurie, G. Dehm, M. Ghidelli, Effect of composition and nanostructure on the mechanical properties and thermal stability of Zr100-xCux thin film metallic glasses, Mater. Design 219 (2022) 110752 doi:0.1016/j.matdes.2022.110752.[4] G. Wu, C. Liu, A. Brognara, M. Ghidelli, Y. Bao, S. Liu, X. Wu, W. Xia, H. Zhao, J. Rao, D. Ponge, V. Devulapalli, W. Lu, G. Dehm, D. Raabe, Z. Li, Symbiotic crystal-glass alloys via dynamic chemical partitioning, Mater. Today 51 (2021) 6-14 doi:10.1016/j.mattod.2021.10.025.[5] A. Brognara, A. Kashiwar, C. Jung, X. Zhang, A. Ahmadian, N. Gauquelin, J. Verbeeck, P. Djemia, D. Faurie, G. Dehm, H. Idrissi, J.P. Best, M. Ghidelli, Tailoring Mechanical Properties and Shear Band Propagation in ZrCu Metallic Glass Nanolaminates Through Chemical Heterogeneities and Interface Density, Small Struct. (2024) 2400011 doi:doi.org/10.1002/sstr.202400011
Boosting mechanical properties of metallic thin films through advanced nanoengineered design strategies
No full textInternational audienceThe current trend toward miniaturization in devices components in key technologies such as micro-/nanoelectronics, energy production, sensors and wear protection requires the development of high-performance nanostructured films with superior mechanical properties. Especially, mutually excluding mechanical properties such as high yield strength and ductility need to be combined, but also high adhesion with the substrate and large fatigue resistance. In order to trigger microstructure-induced material properties, control of the micro-scale structure, atomic composition, average grain size, and layer/film thickness must be optimized based on nanoengineering design concepts. Here, I will present recent results for several class of advanced thin film materials including nanostructured metallic glasses (ZrCu/O, ZrCuAl/O…)[1-3] high entropy alloys (CoCuCrFeNi, Al/CoCuCrFeNi) and multilayers (fully amorphous, amorphous/crystalline, FCC/BCC)[4], highlighting how the control of micro-structure affect the and micro-scale mechanical behavior and enable ultimate mechanical properties.Among the main results, I will present the potential of Pulsed Laser Deposition (PLD)[1] as a novel technique to synthetize nanostructured cluster-assembled ZrCu, ZrCuAl/O, and CoCuCrFeNi films, reaching ultimate yield strength (>4 GPa) and ductility (>15 %) for ZrCuAl/O films. I will show how controlling of the sublayer thickness (from 100 down to 5 nm) in fully amorphous nanolaminates influences the deformation behavior, suppressing the shear bands formation, while tuning the mechanical properties with mutual combination of large ductility (>10%) and yields strength (>2.5 GPa). Additionally, I will discuss the synthesis of alternating CrCoNi (crystalline)/TiZrNbHf (amorphous) nanolayers results in an high yield strength (3.6 GPa) and homogeneous deformation (~15%)[4].Finally, I will present recent developments within LSPM, highlighting new research activities dealing with the synthesis of nanostructured metallic films and the development of a new platform for in situ SEM mechanical-electrical characterization.References [1] M. Ghidelli, A. Orekhov, A.L. Bassi, G. Terraneo, P. Djemia, G. Abadias, M. Nord, A. Béché, N. Gauquelin, J. Verbeeck, J.-P. Raskin, D. Schryvers, T. Pardoen, H. Idrissi, Novel class of nanostructured metallic glass films with superior and tunable mechanical properties, Acta Mater. 213 (2021) 116955 [2] C. Poltronieri, A. Brognara, F. Bignoli, S. Evertz, P. Djemia, D. Faurie, F. Challali, C. Li, L. Belliard, G. Dehm, J.P. Best, M. Ghidelli, Mechanical properties and thermal stability of ZrCuAlx thin film metallic glasses: Experiments and first-principle calculations, Acta Mater. 258 (2023) 119226 [3] A. Brognara, J.P. Best, P. Djemia, D. Faurie, G. Dehm, M. Ghidelli, Effect of composition and nanostructure on the mechanical properties and thermal stability of Zr100-xCux thin film metallic glasses, Mater. Design 219 (2022) 110752 [4] G. Wu, C. Liu, A. Brognara, M. Ghidelli, Y. Bao, H. Zhao, J. Rao, D. Ponge, V. Devulapalli, W. Lu, G. Dehm, D. Raabe, Z. Li, Symbiotic crystal-glass alloys via dynamic chemical partitioning, Mater. Today 51 (2021) 6-1
Instrumented crutches for gait parameters evaluation
No full textMost of the prototypes of instrumented crutches available in the literature require external motion capture devices to perform a gait analysis and to report the load applied on the crutches with respect to the gait cycle. Motion capture systems with markers require a controlled laboratory with cameras, instead IMU-based systems are more transportable, but the user must be instrumented. A new version of instrumented crutches, previously developed by the authors, allows one to measure the axial forces and to detect the gait phases during two-point assisted walking thanks to the cameras mounted on the lower part of the crutches
Mechanical properties of ZrCuAlx thin film metallic glasses and nanolaminates: experiments and first principle calculations
No full textInternational audienceThe synthesis of advanced thin film metallic glasses (TFMGs) with tailored composition and engineered microstructures capable to provide a large combination of mutually exclusive mechanical properties (i.e. high strength and ductility) mitigating the shear band (SB) instability, is an open research topic. Here, I will present recent results involving two (2) strategies to finely to improve the mechanical behaviour of TFMGs including (i) the addition of intrinsically ductile elements (Al) and the (ii) development of fully amorphous nanolaminated structures.Firstly, I will provide a holistic picture about the relationship between atomic structure, mechanical properties, and thermal stability of ZrCuAlx TFMGs varying the Al content from 0 to 12 at.%, carrying out a broad characterization involving experiments and ab initio molecular dynamic simulations (AIMD). I will show that the addition of Al resulted in a change of average interatomic distances by ∼10 pm with the formation of shorter bonds (Al-Zr and Al-Cu), influencing the mechanical response (shear/elastic moduli and hardness) which increases by ∼15% for 12 at.% Al. Moreover, tensile tests on polymer substrate revealed a maximum value for the crack initiation strain of 2.1% for ZrCuAl9, while the strain-to-failure rapidly decreases at higher Al contents. The observed reduction in damage tolerance is correlated to a transition in atomic configuration. Specifically, a maximum in density of full and defective icosahedral cluster population is observed at 9 at.% Al, inducing a more shear-resistant behavior to the material [1].Then, I will discuss the fabrication of ZrCu/ZrCuAl9 nanolaminates with different nanoscale bilayer period (Λ, from 200 down to 50 nm). I will show the combined effect of local chemistry variation and nanointerface density influences the propagation of SBs with enhanced plastic deformation (> 10 %) is observed for Λ = 100 and 200 nm during micropillar compression, but accompanied by a reduction of the yield strength. In contrast, for Λ = 50 nm, deformation is dominated by catastrophic SB events, while the yield strength returns to that of the monolithic films of ∼2–2.5 GPa [2].Overall, I will provide guidelines to the design of compositional and microstructural-tailored TFMGs with tuned mechanical properties with potential for applications.REFERENCES[1] C. Poltronieri … M. Ghidelli, Acta Mater., 258, 119226, (2023).[2] C. Poltronieri,… M. Ghidelli, Scripta Mater., 259, 116571, (2025)
Nanoengineering high-performance metallic thin films with large and tunable yield strength and ductility
No full textInternational audienceIn this talk, I will present recent results for several class of advanced thin film materials including nanostructured metallic glasses (ZrCu, ZrCuAl)[1-3], high entropy alloys (Al/CoCuCrFeNi) and nanolaminates[4], highlighting how the control of microstructure affect the deformation mechanisms, enabling large/tunable mechanical properties. I will present the potential of Pulsed Laser Deposition (PLD) as a novel technique to synthetize nanostruc-tured cluster-assembled films reaching ultimate yield strength (>4 GPa) and ductility (>15 %) for ZrCuAl/O films. Moreover, I will show how nanointerfaces in fully amorphous nano-laminates (nanolayers from 100 down to 5 nm) influences the deformation behavior sup-pressing the shear bands, while achieving a balance of large ductility (> 10%) and yield strength (>2.5 GPa). Overall, our results pave the way to the development of nanostructured thin films with boosted mechanical properties and wide application range.[1] M. Ghidelli et al., Novel class of nanostructured metallic glass films with superior and tunable mechanical properties, Acta Mater. 213 (2021) 116955. [2] C. Poltronieri, A. Brognara, F. Bignoli, S. Evertz, P. Djemia, D. Faurie, F. Challali, C. Li, L. Belliard, G. Dehm, J.P. Best, M. Ghidelli, Mechanical properties and thermal stability of ZrCuAlx thin film metallic glasses: Experiments and first-principle calculations, Acta Mater. 258 (2023) 119226.[3] A. Brognara, J.P. Best, P. Djemia, D. Faurie, G. Dehm, M. Ghidelli, Effect of composition and nanostructure on the mechanical properties and thermal stability of Zr100-xCux thin film metallic glasses, Mater. Design 219 (2022) 110752.[4] G. Wu, M. Ghidelli et al., Symbiotic crystal-glass alloys via dynamic chemical partitioning, Mater. Today 51 (2021) 6-14
Plasma exchange and immunosuppressive therapy in a case of mild haemophilia A with inhibitors and a life-threatening lower limb haemorrhage.
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