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Interconnection between microstructure and microhardness of directionally solidified binary Al-6wt.%Cu and multicomponent Al-6wt.%Cu-8wt.%Si alloys

Overview of attention for article published in Anais da Academia Brasileira de Ciências, May 2016
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Title
Interconnection between microstructure and microhardness of directionally solidified binary Al-6wt.%Cu and multicomponent Al-6wt.%Cu-8wt.%Si alloys
Published in
Anais da Academia Brasileira de Ciências, May 2016
DOI 10.1590/0001-3765201620150172
Pubmed ID
Authors

ANGELA J. VASCONCELOS, RAFAEL H. KIKUCHI, ANDRÉ S. BARROS, THIAGO A. COSTA, MARCELINO DIAS, ANTONIO L. MOREIRA, ADRINA P. SILVA, OTÁVIO L. ROCHA

Abstract

An experimental study has been carried out to evaluate the microstructural and microhardness evolution on the directionally solidified binary Al-Cu and multicomponent Al-Cu-Si alloys and the influence of Si alloying. For this purpose specimens of Al-6wt.%Cu and Al-6wt.%Cu-8wt.%Si alloys were prepared and directionally solidified under transient conditions of heat extraction. A water-cooled horizontal directional solidification device was applied. A comprehensive characterization is performed including experimental dendrite tip growth rates (VL) and cooling rates (TR) by measuring Vickers microhardness (HV), optical microscopy and scanning electron microscopy with microanalysis performed by energy dispersive spectrometry (SEM-EDS). The results show, for both studied alloys, the increasing of TR and VL reduced the primary dendrite arm spacing (l1) increasing the microhardness. Furthermore, the incorporation of Si in Al-6wt.%Cu alloy to form the Al-6wt.%Cu-8wt.%Si alloy influenced significantly the microstructure and consequently the microhardness but did not affect the primary dendritic growth law. An analysis on the formation of the columnar to equiaxed transition (CET) is also performed and the results show that the occurrence of CET is not sharp, i.e., the CET in both cases occurs in a zone rather than in a parallel plane to the chill wall, where both columnar and equiaxed grains are be able to exist.

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Mendeley readers

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Geographical breakdown

Country Count As %
Unknown 14 100%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 4 29%
Professor 3 21%
Student > Doctoral Student 1 7%
Student > Master 1 7%
Unknown 5 36%
Readers by discipline Count As %
Engineering 3 21%
Materials Science 2 14%
Computer Science 1 7%
Unknown 8 57%