A5056253028- Shape Memory Alloy Transformations
- Metal and Thin Film Mechanics
- High Entropy Alloys Studies
- Titanium Alloys Microstructure and Properties
- Endodontics and Root Canal Treatments
- Microstructure and Mechanical Properties of Steels
- Dental materials and restorations
- Intermetallics and Advanced Alloy Properties
- Advanced Welding Techniques Analysis
- Thin-Film Transistor Technologies
- Dental Radiography and Imaging
- Occupational health in dentistry
- Aluminum Alloys Composites Properties
- Microstructure and mechanical properties
- Welding Techniques and Residual Stresses
- Silicon Nanostructures and Photoluminescence
- ZnO doping and properties
- Metallurgy and Material Forming
- Silicon and Solar Cell Technologies
- Advanced materials and composites
- Ferroelectric and Piezoelectric Materials
- Semiconductor materials and interfaces
- Laser and Thermal Forming Techniques
- Advanced ceramic materials synthesis
- Metal Alloys Wear and Properties
Universidade Nova de Lisboa
2016-2025
Universidade Unigranrio
2022
Uninova
1998-2021
Sorbonne Université
2020
Departamento de Ciência e Tecnologia
2004-2018
YDreams (Portugal)
2017
Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento
2017
Polytechnic University of Timişoara
2015
National Institute for Space Research
2014-2015
University of Lisbon
1994-2014
High entropy alloys have emerged as novel engineering with remarkable mechanical properties in a wide range of temperatures. Among the several high that were already described, equiatomic CrMnFeCoNi alloy is most studied one. In this work, gas tungsten arc welding as-rolled sheets was performed. The microstructural characterization encompassed use electron microscopy, including backscattered diffraction, synchrotron X-ray diffraction analysis, microhardness testing and evaluation. A...
It is often reported that, to successfully join NiTi shape memory alloys, fusion-based processes with reduced thermal affected regions (as in laser welding) are required. This paper describes an experimental study performed on the tungsten inert gas (TIG) welding of 1.5 mm thick plates Ni-rich NiTi. The functional behavior joints was assessed. superelasticity analyzed by cycling tests at maximum imposed strains 4, 8 and 12% for a total 600 cycles, without rupture. superelastic plateau...
Novel bionanocomposite films of chitosan/montmorillonite (CS/MMT) activated with ginger essential oil (GEO) were produced and characterized in terms their physical morphological properties. The homogenization process led to a good interaction between the chitosan nanoparticles, however exfoliation was diminished when GEO incorporated. Film glass transition temperature did not statistically change incorporation either MMT or GEO, value slightly reduced, representing relaxation polymer chain...
AbstractTo calculate the internal stresses in steels during quenching it is necessary to be able predict accurately evolution of phase transformations cooling process. After a review published papers, mathematical model coupling with temperature field predictions at each instant process proposed. Incubation and growth periods are treated separately, using Scheil's method Johnson–Mehl–Avrami formulation, respectively. Martensitic considered separately Koistinen Marburger law. The calculation...
Abstract Aim To compare six reciprocating instruments regarding their geometric design, metallurgical characteristics, mechanical behaviour and ability to prepare root canals. Methodology A total of 246 new 25‐mm NiTi (41 per group) from systems (Reciproc, Reciproc Blue, One Files, Files Reverso Silver, WaveOne Gold) were evaluated throughout a multimethod approach design using stereomicroscopy (number blades helix angle) scanning electron microscopy (blades symmetry, cross section surface...
The current study aimed to compare the F1 endodontic instruments from five different heat-treated rotary systems regarding their design, metallurgical properties, and mechanical performance. Five root canal shaping (ProTaper Gold [PTG], Premium Taper Gold, Go-Taper Flex, EdgeTaper Platinum, Super Files Blue)-plus, a conventional ProTaper Universal (PTU)-which were evaluated nickel/titanium ratio, phase transformation temperatures, microhardness, cyclic fatigue, torsional bending strengths....