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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Evaluation of the thixoformability of the A332 Alloy (Al-9.5 wt%Si-2.5 wt% Cu)

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Autor(es):
Zoqui, Eugenio Jose [1] ; Naldi, Marco Antonio [1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Dept Mfg, Fac Mech Engn, BR-13083970 Campinas, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Journal of Materials Science; v. 46, n. 23, p. 7558-7566, DEC 2011.
Citações Web of Science: 10
Resumo

The main purpose of this article is to develop and/or use a commercial conventional low-cost raw material as thixoforming material in order to diminish the costs of the thixoforming process. Semi-solid technology usually uses aluminium low-silicon alloys such A356 (Al-7.0wt% Si) as raw materials. High silicon content alloys with a quasi-eutectic composition diminish the semi-solid range, making it difficult to control the thixoforming temperature, although present excellent mechanical properties. This article reports on the semi-solid behaviour of Al-9.5 wt% Si-2.5 wt% Cu (A332). Thermo-Calc simulations and experimental DSC techniques were used to map the temperature transition from solid to liquid in order to achieve the best semi-solid behaviour and hence the best thixoforming temperature. Samples were reheated at three temperatures to 30, 45 and 60% of the solid fraction applying holding times of 0, 30, 90 and 210 s. The morphological evolution and semi-solid behaviour of the samples at these temperatures were determined via the fixed platen compression test. The structure showed the best semi-solid behaviour at 572 degrees C, with an apparent viscosity of up to 1.5 x 10(5) Pa s. The results indicated that the semi-solid behaviour of the commertial Al-9.5 wt% Si-2.5 wt% Cu alloy is similar to that of the alloy A356. Despite its large dendritic structure it is possible, with the correct combination of temperature and time, to use this alloy as raw material for the thixoforming process. Furthermore, semi-solid parts can be produced by thixoforging using this low-cost material without any special preparation. (AU)

Processo FAPESP: 09/17260-0 - Tixoconformação de novas ligas Al-Si-(Cu-Mg-Zn)
Beneficiário:Eugênio José Zoqui
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 08/03946-4 - Lingotamento e tixoconformação de novas ligas Al-Si-Mg e Al-Si-Cu-Mg
Beneficiário:Eugênio José Zoqui
Modalidade de apoio: Auxílio à Pesquisa - Regular