Loading...

The effect of Ti on mechanical properties of extruded in-situ Al-15 pct Mg2Si composite

Soltani, N ; Sharif University of Technology | 2013

783 Viewed
  1. Type of Document: Article
  2. DOI: 10.1007/s11661-013-1747-2
  3. Publisher: 2013
  4. Abstract:
  5. This work was carried out to investigate the effect of different Ti concentrations as a modifying agent on the microstructure and tensile properties of an in-situ Al-15 pctMg2Si composite. Cast, modified, homogenized small ingots were extruded at 753 K (480°C) at the extrusion ratio of 18:1 and ram speed of 1 mm/s. Various techniques including metallography, tensile testing, scanning electron microscopy were used to characterize the mechanical behavior, microstructural observations, fracture mechanisms of this composite. The results showed that 0.5 pctTi addition and homogenizing treatment were highly effective in modifying Mg2Si particles. The results also exhibited that the addition of Ti up to 0.5 pct 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 pct for homogenized and extruded Al-15 pctMg2Si-0.5 pctTi composite, respectively. Fracture surface examinations revealed a transition from brittle fracture mode in the as-cast composite to ductile fracture in homogenized and extruded specimens. This can be attributed to the changes in size and morphology of Mg2Si intermetallic and porosity content
  6. Keywords:
  7. Fracture mechanisms ; Fracture surfaces ; Homogenizing treatment ; Mechanical behavior ; Micro-structural observations ; Porosity contents ; Tensile elongation ; Ultimate tensile strength ; Brittle fracture ; Ductile fracture ; Intermetallics ; Mechanical properties ; Metal castings ; Microstructure ; Scanning electron microscopy ; Silicon ; Tensile strength ; Tensile testing ; Aluminum
  8. Source: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science ; Volume 44, Issue 9 , September , 2013 , Pages 4366-4373 ; 10735623 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs11661-013-1747-2