Comparison of morphological evolution of al-7wt%si-2.5wt%cu alloy produced by direct chill casting/electromagnetic stirring and ECAP
Luis Vanderlei Torres, Cecilia Tereza Weishaupt Proni, Eugênio José Zoqui
ARTIGO
Inglês
Agradecimentos: The authors acknowledge the Brazilian research funding agencies FAPESP (São Paulo Research Foundation – Project 2013/09961-3), CNPq (National Council for Scientific and Technological Development – Project 470572-2011-6) and CAPES (Federal Agency for the Support and Evaluation of...
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Agradecimentos: The authors acknowledge the Brazilian research funding agencies FAPESP (São Paulo Research Foundation – Project 2013/09961-3), CNPq (National Council for Scientific and Technological Development – Project 470572-2011-6) and CAPES (Federal Agency for the Support and Evaluation of Postgraduate Education) for their financial support of this research. The authors are also indebted to FEM/UNICAMP – Faculty of Mechanical Engineering, State University of Campinas and IFSP – Federal Institute of Education, Science and Technology of São Paulo campus Bragança Paulista for its practical support
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In semisolid state forming the thermodynamic control of the solid liquid transition is necessary but not sufficient condition for having a good processing. For thixoforming it is critical to have a refined microstructure that during the heating to the semisolid state, achieve a mixture of small...
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In semisolid state forming the thermodynamic control of the solid liquid transition is necessary but not sufficient condition for having a good processing. For thixoforming it is critical to have a refined microstructure that during the heating to the semisolid state, achieve a mixture of small spheres immerse in liquid, which is crucial in order to get the best rheological properties for the slurry. This work compares the morphological evolution at the semisolid state of the Al-7wt%Si-2.5wt%Cu alloy produced by a) direct chill casting under electromagnetic stirring (EMS) combined with grain refinement and b) processed via one single pass in an equal channel angular pressing. EMS introduces metal flow during solidification that allows the better distribution of the nuclei provide by the grain refiner. ECAP has emerged as a promising technique capable of imposing large homogeneous deformations in metals, that could leads to a optimal grain refining. The ECAP deformation occurs in a die that contains two channels of the same cross-sectional area and form an angle of 120°. The raw materials were submitted to a heating treatment in order to reach 60% liquid fraction, at soaking times of 0s, 30s, 90s and 210s and the microstructure was evaluated via B&W and color metalography. Comparing the two production processes, it is observed that the ECAP process is highly efficient: while the traditional EMS method produced grains about 150 μm size, ECAP technique achieved grains of 60 μm, providing a fully globular structure, which exhibit favorable characteristics for the thixoforming process reaching to apparent viscosity about 2*104Pa.s
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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
470572-2011-6
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2013/09961-3
COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES
Fechado
Comparison of morphological evolution of al-7wt%si-2.5wt%cu alloy produced by direct chill casting/electromagnetic stirring and ECAP
Luis Vanderlei Torres, Cecilia Tereza Weishaupt Proni, Eugênio José Zoqui
Comparison of morphological evolution of al-7wt%si-2.5wt%cu alloy produced by direct chill casting/electromagnetic stirring and ECAP
Luis Vanderlei Torres, Cecilia Tereza Weishaupt Proni, Eugênio José Zoqui
Fontes
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Solid state phenomena Vol. 256 (Sept., 2016), p. 17-24 |