Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Behavior of Intradendritic and Interdendritic Microhardness of an Aluminum-Silicion Alloy Directionally Solidified
Submission Author:
Gianfranco Stieven , RJ , Brazil
Co-Authors:
Gianfranco Stieven, Daniele Soares, David Lafont, Erb Lins, EDILMA OLIVEIRA
Presenter: Daniele Soares
doi://10.26678/ABCM.COBEM2017.COB17-2420
Abstract
The microhardness is a mechanical property that can represent the resistance of some phase or precipitation, inclusion or defect included on the material structure to be penetrated. In metal alloys that are exposed to various phase modifications, as those which are produced by unsteady-state solidification, the variation of the microhardness promotes an anisotropy that are not convenient for the performance of the material. In the case of non-ferrous alloys of the aluminium-silicon system, the morphology of the silicon in the interdendritic region could promote a non-uniform microhardness in the ingot, which could shows different properties on each millimeter distance from the metal-mold interface. This paper aims to present the evaluation of the interdendritic microhardness of the Al-11wt.%Si alloy solidified in a directional horizontal device, in order to verify the influence of the morphology of the silicon on the microhardness of the specimen, based on the distance of the metal-mold and cooling rate applied in its solidification. The results conclude that the silicon morphology does not significantly influence the increase or reduction of the microhardness of the casting, even with its eutectic modification in the solidification process.
Keywords
Horizontal solidification, Al-Si alloy, Microhardness, Interdendritic, Intradendritic
