Thixoforming
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. High-Frequency Induction Heating of Al-Si-Cu-Mg aluminum alloy in Thixoforming
Thixoforming is the process of shaping near net shape metal components in a semisolid state. The process consists of preparing feedstock, reheating and shaping. Reheating the billet is the most critical step in thixoforming. Induction heating requires precise temperature control to obtain globular microstructure and prevent process defects, such as insuffici
Mat. Res.. Publicado em: 28/10/2019
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2. Solution Treatment Behaviors of 6061 Aluminum Alloy Prepared by Powder Thixoforming
Powder thixoforming (PTF) was a promising processing technology that can be used to fabricate high strength particle reinforced aluminum matrix composites, and a pioneer 6061 matrix alloy was fabricated utilizing PTF to investigate its solution treatment behaviors. A comparison study with traditional permanent mold cast (PMC) 6061 alloy disclosed that PTF al
Mat. Res.. Publicado em: 07/05/2018
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3. Microstructural characterization of the A356 alloy in different processing routes used in the thixoforming process
ABSTRACT This work aims to evaluate different routes of raw material production to be used in thixoforming process. The semisolid materials exhibit particular structural characteristics, such the characteristic non dendritic structure. The studies for the production of near-net-shape parts have progressed together with the studies of material weight reductio
Matéria (Rio J.). Publicado em: 02/10/2017
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4. Effects of Processing Parameters on Microstructure and Mechanical Properties of Powder-Thixoforged SiC p /6061 Al Composite
A novel processing technology for the fabrication of particle reinforced metal matrix composites, powder thixoforming (PTF), was proposed and 6061 Al-based composites reinforced with 10% volume fractions of SiC particles (SiCp) were fabricated. The effects of processing parameters, such as reheating time, mould temperature and reheating temperature, on its m
Mat. Res.. Publicado em: 05/01/2017
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5. Microstructure Observation of Naturally Aged Thixoforming ZA27 Alloy
The microstructure of the thixoformed ZA27 alloy naturally aged for 5 years has been observed and analyzed. The results indicate that most of the original β + η laminar eutectics have changed into the structures that small α particles uniformly distribute in η phase matrix. Both the β phase and α’ phase have also decomposed. It is suggested that a co
Mat. Res.. Publicado em: 24/11/2015
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6. Effect of Pouring Temperature and Water Cooling on the Thixotropic Semi-solid Microstructure of A319 Aluminium Cast Alloy
The cooling slope (CS) casting is the simplest and cheapest technique for producing feedstock materials with non-dendritic microstructure. Such materials are required for semi-solid metal (SSM) processing methods such as thixoforming. In the present investigation, the effect of the pouring temperature and the water cooling on the thixotropic microstructure o
Mat. Res.. Publicado em: 2015-02
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7. Análise da viabilidade do uso da liga AA332 para processos de tixoconformação / Evaluation of thixoformability of AA332 for the thixoforming technology
A tecnologia de semi-sólidos normalmente utiliza ligas de alumínio de baixo silício, como AA356 (Al-7,0wt%Si) como matéria-prima. Ligas contendo alto teor de silício com uma composição quasi-eutética diminuem a faixa semi-sólida, tornando difícil controlar a temperatura de tixoconformação. Entretanto, ligas de alumínio com alto teor de silício
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/12/2011
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8. EValuation of the thixoformability of AA7004 and AA7075 alloys
This study involved a complete evaluation of the thixoformability of AA7004 and AA7075 alloys, from their microstructural characterization to their viscous behavior. The alloys were subjected to globularization heat treatments for 0, 30, 90 and 210 seconds in two conditions of solid fractions, 45 and 60%, and to viscosity assays under the same conditions. He
Materials Research. Publicado em: 2010-09
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9. Analysis of the application potentiality of nodular cast iron ASTM A536 60-40-18 as raw material for thixoforming processes / Estudo da potencialidade da aplicação do ferro fundido nodular ASTM A536 60-40-18 como materia prima para processos de tixoconformação
This work analyses the thixoability, the viability of actual production of thixotropic semi-solid of ferritic nodular cast iron ASTM A536 60-40-18, as well as the phase transformations taking place in the process. Thixoability evaluation is made through thermal analysis by Differential Thermal Analysis (DTA) and Differential Scanning Calorimetry (DSC) tests
Publicado em: 2009
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10. Avaliação da tixoconformabilidade das ligas AA7075 a AA7004 / Evaluation of thixoformability of AA7075 and AA7004 alloys
The goal of this work was to evaluate the thixoformability of AA7075 and AA7004 alloys, including all the stages process: characterization in terms of micro and macrostructures; characterization of the rheological behavior; and the tixoforging process in an eccentric press using a matrix-type close. The alloys were submitted to re-heating treatment for 0s, 3
Publicado em: 2009
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11. Produção de esponjas metalicas por tixoconformação em pre-formas removiveis e sua caracterização mecanico-metalurgica / Production of metal sponges by thixoforming into removable space holders preform and their machanical and metallurgical characterization
Este trabalho teve como objetivo estudar o processo de produção de esponjas metalicas por tixoconformacao em pré-formas removiveis e caracterizacao mecanico-metalurgica do produto, visando a compreensão da influencia de parametros de processo nas suas caracteristicas estruturais e propriedades. A liga empregada, AA2011, foi infiltrada sobre pre-formas de
Publicado em: 2008
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12. Tixoformabilidade e tixoforjamento de ligas Al-Xwt%Si-0,5wt%Mg em prensa excentrica com matriz aberta / Thixoformability and thixoforming of Al-Xwt%Si-0,5wt%Mg in an accentric press with matrix-type open alloy
Este trabalho apresenta uma análise da viabilidade do emprego de quatro ligas Al- Si-Mg como matéria-prima tixoconformável, e a utilização destas em tixoforjamento em prensa do tipo excêntrica em matriz do tipo aberta. As quatro ligas Al-Si-Mg, com 1, 2, 4 e 7wt%Si e 0,5wt%Mg, foram produzidas por ultra-refino (adição de Al-5wt%Ti- 1wt%B), e a avalia
Publicado em: 2008