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Título del libro: Tms 2013 142nd Annual Meeting And Exhibition, Annual Meeting
Título del capítulo: The effect of ti on mechanical properties of extruded in-situ Al-15% Mg2Si composite

Autores UNAM:
NILOOFAR SOLTANI; AMIN BAHRAMI;
Autores externos:

Idioma:
Inglés
Año de publicación:
2013
Palabras clave:

Aluminum; Aluminum compounds; Ductile fracture; Extrusion; Magnesium compounds; Mechanical properties; Metal castings; Scanning electron microscopy; Surface analysis; Tensile strength; Tensile testing; Titanium; Elongation values; Fracture surface analysis; Fracture surfaces; Homogenizing treatment; Hot extrusion; In-situ composite; Tensile elongation; Ultimate tensile strength; Silicon compounds


Resumen:

This work was carried out to investigate the effect of Ti concentration as a modifying agent on the microstructure and tensile properties of an in-situ Al-15%Mg2Si composite. As-cast, modified and homogenized small ingots were extruded at 480 °C at an extrusion ratio of 18:1, using a ram speed of 1 mm/s. The specimens were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and evaluated in tensile tests, followed by fracture surface analysis. The results showed that 0.5%Ti addition and homogenizing treatment were highly effective in modifying the Mg2Si particles. The results also indicated that the addition of Ti up to 0.5% increases both ultimate tensile strength (UTS) and tensile elongation values. The highest UTS and elongation values were found to be 245 MPa and 9.5% for homogenized and extruded Al-15%Mg2Si-0.5%Ti composite. Fracture surface examinations revealed a transition from brittle fracture mode in as-cast composites to ductile fracture in homogenized and extruded specimens. This is attributed to the changes in size and morphology of Mg2Si intermetallic and in porosity content. © 2013 by The Minerals, Metals & Materials Society. All rights reserved.


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