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SIIA Público
SISTEMA INTEGRAL DE INFORMACIÓN ACADÉMICA - PÚBLICO
Título del libro: Tms Annual Meeting Título del capítulo: The effect of Ti on mechanical properties of extruded in-situ Al-15% Mg2Si composite
Elongation values; Fracture surface analysis; Fracture surfaces; Homogenizing treatment; Hot extrusion; In-situ composite; Tensile elongation; Ultimate tensile strength; Brittle fracture; Ductile fracture; Exhibitions; Intermetallics; Mechanical properties; Metal castings; Scanning electron microscopy; Silicon; Surface analysis; Tensile strength; Tensile testing; Titanium; X ray diffraction; Aluminum
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.
