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vol.20 suppl.2Microstructural Characterization and Evaluation of the Thermomechanical Behavior of an Al 7075-T651 Alloy Deformed by Two Passes of ECAPCu-Sn Coatings Produced Using Environmentally Non-Aggressive Electrolyte Containing Sodium Tartrate índice de autoresíndice de assuntospesquisa de artigos
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Materials Research

versão impressa ISSN 1516-1439versão On-line ISSN 1980-5373

Resumo

MAGNO, Igor Alexsander Barbosa et al. Effect of the T6 Heat Treatment on Microhardness of a Directionally Solidified Aluminum-Based 319 Alloy. Mat. Res. [online]. 2017, vol.20, suppl.2, pp.662-666.  Epub 30-Nov-2017. ISSN 1516-1439.  http://dx.doi.org/10.1590/1980-5373-mr-2016-0961.

Aluminum alloys of the ANSI series 319 present Si and Cu as the main alloying elements and the mechanical strength of these alloys can be improved by the precipitation of the metastable Al2Cu phase during the ageing heat treatment. In this paper, the Al-5.5wt.%Si-3wt.%Cu alloy was elaborated and solidified in a water-cooled horizontal directional solidification device. The as-cast ingot was subjected to the precipitation hardening heat treatment (T6 heat treatment), which consisted of: solution for 5 h at 490°C±2°C, followed by quenching in water at 60°C±2°C and ageing for 3 h at 155°C±2°C, and cooling-air. Secondary dendrite arm spacing (λ2) measurements were carried out before and after T6 heat treatment. The mechanical strength of the alloy was investigated by the microhardness test. It has been found that the heat treatment did not influence the λ2 values, however, highest HV values have been observed for the heat-treated samples.

Palavras-chave : T6 Heat Treatment; Microstructure; Al-Cu-Si Alloys.

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