Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Roberto Braga Figueiredo"'
Autor:
Michelle Dias Alves Lage, Mariana Duarte de Oliveira, Pedro Henrique Rodrigues Pereira, Roberto Braga Figueiredo, Vanessa Freitas Cunha Lins
Publikováno v:
Journal of Materials Research and Technology, Vol 18, Iss , Pp 2745-2753 (2022)
This work aims at evaluating the effect of microstructure on the corrosion behavior of an Al–Mg–Sc alloy processed by high-pressure torsion (HPT) and annealed from 523 to 773 K. The corrosion resistance of the annealed alloy was evaluated by usin
Externí odkaz:
https://doaj.org/article/6d3ccf2b138547f99aa1596436543fc1
Autor:
Cleber Granato de Faria, Roberto Braga Figueiredo, Maria Teresa Paulino Aguilar, Paulo Roberto Cetlin
Publikováno v:
Journal of Materials Research and Technology, Vol 4, Iss 3, Pp 297-303 (2015)
ECAP (Equal Channel Angular Pressing) involves the pressing of a prismatic specimen through two channels with the cross-section identical to that of the specimen and intercepting at a certain angle. The specimen undergoes shearing over a single plane
Externí odkaz:
https://doaj.org/article/086d8b9809624e57857c5320bcc6815a
Publikováno v:
Journal of Materials Research and Technology, Vol 4, Iss 1, Pp 14-17 (2015)
High-pressure torsion (HPT) was used to impose severe plastic deformation on a magnesium alloy AZ31. The material was processed for 0.5, 1, 2, 3, 5 and 7 turns at room temperature under a pressure of 6.0 GPa. Samples were annealed for 1800 s at tempe
Externí odkaz:
https://doaj.org/article/0edaa28224604c0081ae905d63d40d3e
Publikováno v:
Journal of Materials Research and Technology, Vol 3, Iss 4, Pp 327-330 (2014)
A eutectic lead–tin alloy was prepared by melting the commercially pure metals and cast in cylindrical molds with 10 mm diameter. The billets were processed by 4 passes of ECAP using a die with 90° between channels through route A and rolled to a
Externí odkaz:
https://doaj.org/article/6d19e31488324b9ebed7930a8c13da44
Autor:
Flávia Spitale Jacques Poggiali, Cláudio Laudares Passos Silva, Pedro Henrique Rodrigues Pereira, Roberto Braga Figueiredo, Paulo Roberto Cetlin
Publikováno v:
Journal of Materials Research and Technology, Vol 3, Iss 4, Pp 331-337 (2014)
Commercially pure magnesium was processed by ECAP from the as-cast condition and also processed by rolling followed by ECAP. The evolution of the microstructure was tracked in both processing routes and compared. The mechanical behavior was evaluated
Externí odkaz:
https://doaj.org/article/655a7ed4e6b348dd8aea328f2b951506
Autor:
Frederico de Castro Magalhães, Roberto Braga Figueiredo, Maria Teresa Paulino Aguilar, Antônio Eustáquio de Melo Pertence, Haroldo Béria Campos, Paulo Roberto Cetlin
Publikováno v:
Tecnologia em Metalurgia, Materiais e Mineração, Vol 11, Iss 2, Pp 131-137 (2014)
Hot forging dies providing high productive performance reduce production costs. The lifetime of the dies is expressed by the number of forgings (production cycle) produced before being rejected by the presence of a failure mechanism, associated wit
Externí odkaz:
https://doaj.org/article/48022df9ee954bbdbdf210613e4ceab8
Autor:
Flávia Spitale Jacques Poggiali, Roberto Braga Figueiredo, Maria Teresa Paulino Aguilar, Paulo Roberto Cetlin
Publikováno v:
Materials Research, Vol 15, Iss 2, Pp 312-316 (2012)
Grain refinement in magnesium is evaluated in the present paper. Equal Channel Angular Pressing is used to process commercially pure magnesium. Processing was carried out at 523 K which is lower than the temperature used in other papers on the litera
Externí odkaz:
https://doaj.org/article/a2629027da354f958a7ac451f0ad3ae0
Autor:
Roberto Braga Figueiredo, André Luiz de Moraes Costa, Margareth Spangler Andrade, Maria Teresa Paulino Aguilar, Paulo Roberto Cetlin
Publikováno v:
Materials Research, Vol 9, Iss 1, Pp 101-106 (2006)
Equal Channel Angular Pressing (ECAP) is the most prominent SPD (Severe Plastic Deformation) method for the production of ultrafine and nanostructured metals, and has been extensively employed and analyzed. This technique was applied to a Pb-4%Sb all
Externí odkaz:
https://doaj.org/article/0310eff8b4a5433fbf0ec6b84c9abd51
Autor:
Roberto Braga Figueiredo
Publikováno v:
Biblioteca Digital de Teses e Dissertações da UFMGUniversidade Federal de Minas GeraisUFMG.
This work has covered all stages from alloy preparation by melting, processing by Equal Channel Angular Pressing-ECAP, microstructural characterization and mechanical properties determination before and after processing and the finite element modelli
Externí odkaz:
http://hdl.handle.net/1843/BUOS-8DHFBE
Publikováno v:
Matéria (Rio de Janeiro), Volume: 27, Issue: 2, Article number: e13201, Published: 09 JAN 2023
High strength concrete is usually cast with low water-to-binder ratio (w/b) in order to produce a compact microstructure with high strength and durability. Autoclave curing can accelerate cement hydration and pozzolanic reactions and further modify m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae2b24d1c59edb72c341033a98a1e9d7
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-70762022000200255&lng=en&tlng=en
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-70762022000200255&lng=en&tlng=en