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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Tensile properties and related microstructural aspects of hypereutectic Al-Si alloys directionally solidified under different melt superheats and transient heat flow conditions

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Author(s):
Reyes, Rodrigo V. ; Bello, Thomas S. ; Kakitani, Rafael ; Costa, Thiago A. ; Garcia, Amauri ; Cheung, Noe ; Spinelli, Jose E.
Total Authors: 7
Document type: Journal article
Source: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 685, p. 235-243, FEB 8 2017.
Web of Science Citations: 22
Abstract

The present investigation deals with directional solidification (DS) of Al-15 wt% and 18 wt% Si alloys under transient heat flow conditions and further characterization of the related microstructures. Emphasis is given on the eutectic growth being affected not only by solidification kinetics but also by melt superheat, which is varied in two degrees for each alloy, i.e., 6% and 23% above the liquidus temperature. The dependences of interphase spacing (lambda) on both solidification kinetics (fast, intermediate and slow cooling conditions) and on melt superheat during solidification of hypereutectic alloys are reported for the first time. Furthermore, functional experimental interrelations of tensile mechanical properties and interphase spacing between eutectic Si particles of both alloys evaluated are proposed. It is shown by these correlations that the tensile properties increase with the decrease in these spacings. More significant variations in properties are associated with a certain range of spacings (1.0 mu m < lambda < 2.3 mu m) in the case of the Al-15 wt%Si alloy. Tensile strength and elongation-to-fracture decrease with increasing alloy silicon content. The applicability of the eutectic growth expression lambda=f (V-1/2) has been verified for the present tested alloys and experimental conditions. (AU)

FAPESP's process: 15/03116-5 - Effects of silicon content and cooling rate on the solidification of hypereutectic Al-Si alloys
Grantee:Thômas Scarassati Bello
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 15/11863-5 - Microstructure evaluation of ternary Al-Si-Cu, Sn-Bi-Sb and Zn-Sn-Cu and its correlations with mechanical properties
Grantee:José Eduardo Spinelli
Support Opportunities: Regular Research Grants