Search Results - "CARVALHO COELHO, Gilberto"

Magnetic characterization of Mn5SiB2 and Mn5Si3 phases by DE ALMEIDA, Daniel Martins, BORMIO-NUNES, Cristina, NUNES, Carlos Angelo, COELHO, Adelino A, CARVALHO COELHO, Gilberto

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On the peritectoid Ti3Si formation in Ti-Si alloys by SARAIVA RAMOS, Alfeu, NUNES, Carlos Angelo, CARVALHO COELHO, Gilberto

“…Ti-13DDT5Si and Ti-25Si (at.%) alloys have been arc-melted from high-purity raw materials, using a water-cooled copper hearth, a non-consumable tungsten…”
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Thermodynamic modeling of the V-Si-B system by Pinto da Silva, Antonio Augusto Araujo, Chaia, Nabil, Ferreira, Flavio, Carvalho Coelho, Gilberto, Fiorani, Jean-Marc, David, Nicolas, Vilasi, Michel, Nunes, Carlos Angelo

“…In the present work, the V-Si-B ternary system was thermodynamically modeled using the CALPHAD method. The thermodynamic descriptions of the V-Si and B-Si…”
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Solutioning and Aging of MAR-M247 Nickel-Based Superalloy by Baldan, Renato, da Rocha, Rafaela Lisboa Pereira, Tomasiello, Rafael Bogado, Nunes, Carlos Angelo, da Silva Costa, Alex Matos, Barboza, Miguel Justino Ribeiro, Coelho, Gilberto Carvalho, Rosenthal, Ruben

“…Despite the existence of previous studies on the heat treatment of the MAR-M247 superalloy, there is a lack of microstructural characterization data that…”
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Nb-Al Binary System: Reevaluation of the Solubility Limits of the (Nb), Nb3Al, Nb2Al and NbAl3 Phases at High Temperatures by Silva, Antonio Augusto Araujo Pinto da, Coelho, Gilberto Carvalho, Nunes, Carlos Angelo, Fiorani, Jean Marc, David, Nicolas, Vilasi, Michel

“…In this work a re-investigation of the solubility limits of the (Nb), Nb3Al, Nb2Al and the Nb-rich side of the NbAl3 phases on the Nb-Al system is presented…”
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Thermodynamic Evaluation of the Phase Stability and Microstructural Characterization of a Cast B1914 Superalloy by da Silva Costa, Alex Matos, Nunes, Carlos Angelo, Baldan, Renato, Coelho, Gilberto Carvalho

“…The boron-carbon superalloys (BC alloys) were developed to reduce the carbon content of the alloys to less than 0.02 wt.% and increase the boron content to…”
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Experimental determination of the Ta–Ge phase diagram by da Silva, Antonio Augusto Araújo Pinto, Coelho, Gilberto Carvalho, Nunes, Carlos Angelo, Suzuki, Paulo Atsushi, Fiorani, Jean Marc, David, Nicolas, Vilasi, Michel

“…•Ta–Ge phase diagram propose for the first time.•The phase αTa5Ge3 was not observed in samples investigated in this work.•Three eutectics reactions where…”
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Solution heat-treatment of Nb-modified MAR-M247 superalloy by Azevedo e Silva, Paulo Ricardo Soares, Baldan, Renato, Nunes, Carlos Angelo, Coelho, Gilberto Carvalho, Costa, Alex Matos da Silva

“…MAR-M247 superalloy has excellent mechanical properties and good oxidation resistance at elevated temperatures. Niobium is an element known as γ′ phase…”
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New data on phase equilibria in the Nb-rich region of the Nb-B system by BORGES JUNIOR, Luiz Antonio, CARVALHO COELHO, Gilberto, NUNES, Carlos Angelo, SUZUKI, Paulo Atsushi

“…The currently accepted Nb-B phase diagram shows NbSS (solid solution), Nb3B2, NbB, Nb5B6, Nb3B4, NbB2, B, and liquid L as the stable phases in this system…”
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Magnetization studies of binary and ternary Co-rich phases of the Co–Si–B system by Bormio-Nunes, Cristina, Nunes, Carlos Angelo, Coelho, Adelino A., Faria, Maria Ismênia Sodero Toledo, Suzuki, Paulo Atsushi, Coelho, Gilberto Carvalho

“…[Display omitted] ▶ Co 5Si 2B phase was found to be paramagnetic, while Fe 5SiB 2 and Mn 5SiB 2 are ferromagnetic. ▶ Ferromagnetic Co 2B phase showed…”
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Aging of a New Niobium-Modified MAR-M247 Nickel-Based Superalloy by Baldan, Renato, Azevedo e Silva, Paulo Ricardo Soares, Nunes, Carlos Angelo, Coelho, Gilberto Carvalho

“…MAR-M247 is a nickel-based superalloy that contains 3 wt.% Ta (weight percent of tantalum). Considering the chemical similarity between tantalum and niobium…”
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Microstructural Characterization of As-Cast V-Si Alloys and Reevaluation of the Invariant Reactions Involving the Liquid Phase of the V-Si System by Lima-Kühn, Belmira Benedita de, Silva, Antonio Augusto Araujo Pinto da, Suzuki, Paulo Atsushi, Coelho, Gilberto Carvalho, Nunes, Carlos Angelo

“…Alloys containing Me-Si-B (Me - Refractory Metal) are of great interest for high temperature structural applications and accurate knowledge of its low order…”
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Microstructural evidence of beryllium in commercial dental Ni-Cr alloys by Alkmin, Luciano Braga, Silva, Antonio Augusto Araújo Pinto da, Nunes, Carlos Angelo, Santos, Claudinei dos, Coelho, Gilberto Carvalho

“…The focus of this work was to determine microstructural features in commercial Ni-Cr alloys which could be used to identify indirectly the presence of…”
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Isothermal section of the Ti-Si-B system at 1250 ° C in the Ti-TiSi2-TiB2 region by Ramos, Alfeu Saraiva, Baldan, Renato, Nunes, Carlos Angelo, Coelho, Gilberto Carvalho, Suzuki, Paulo Atsushi, Rodrigues, Geovani

“…A partial isothermal section (Ti-TiSi2-TiB2 region) of the ternary Ti-Si-B system at 1250 ° C was determined from heat-treated alloys prepared via arc melting…”
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Thermal expansion of the W5Si3 and T2 phases of the W–Si–B system investigated by high-temperature X-ray diffraction by Rodrigues, Geovani, Chad, Vanessa Motta, Nunes, Carlos Angelo, Suzuki, Paulo Atsushi, Coelho, Gilberto Carvalho

“…The coefficients of thermal expansion (CTE) of the W5Si3 and T2 phases of the W-Si-B system were determined using high-temperature X-ray diffraction in the…”
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On Ti-18Si-6B and Ti-7.5Si-22.5B powder alloys prepared by high-energy ball milling and sintering by Fernandes, Bruno Bacci, Ramos, Alfeu Saraiva, Moura Neto, Carlos de, Coelho, Gilberto Carvalho, Suzuki, Paulo Atsushi

“…Recently, a new ternary phase was discovered in the Ti-Si-B system, located near the Ti6Si2B composition. The present study concerns the preparation of…”
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Evaluation of Ti3Si Phase Stability from Heat-Treated, Rapidly Solidified Ti-Si Alloys by da Silva Costa, Alex Matos, de Lima, Gisele Ferreira, Rodrigues, Geovani, Nunes, Carlos Angelo, Coelho, Gilberto Carvalho, Suzuki, Paulo Atsushi

“…Ti-base alloys containing significant amounts of silicon have been considered for high temperature structural applications. Thus, information concerning phase…”
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Lattice parameters and thermal expansion of the T2-phase of the Nb–Si–B system investigated by high-temperature X-ray diffraction by Rodrigues, Geovani, Nunes, Carlos Angelo, Suzuki, Paulo Atsushi, Coelho, Gilberto Carvalho

“…The lattice parameters and thermal expansion coefficients (*aa and *ac) of the T2-phase of the Nb-Si-B system with different boron contents were determined…”
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Microstructural characterization of as-cast hf-b alloys by Gigolotti, João Carlos Jânio, Suzuki, Paulo Atsushi, Nunes, Carlos Angelo, Coelho, Gilberto Carvalho

“…An accurate knowledge of several metal-boron phase diagrams is important to evaluation of higher order systems such as metal-silicon-boron ternaries. The…”
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On the stability of the V5B6-phase by NUNES, Carlos Angelo, DE LIMA, Belmira Benedita, CARVALHO COELHO, Gilberto, ROGL, Peter, ATSUSHI SUZUKI, Paulo

“…The currently assessed V-B phase diagram indicates a peritectoid formation at 1727DGC (V3B4 + VB DB V5B6) for the V5B6 boride. The observation of this phase in…”
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