Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 490, Issue 1-2, Pages 250-257Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.01.039
Keywords
Al/Mg2Si composite; tensile properties; modification; casting
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Funding
- University of Tehran
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The effects of both Li modification and cooling rate on the microstructure and tensile properties of an in situ prepared Al-15%Mg2Si composite were investigated. It was found that the addition of 0.3%Li reduces the average size Of M92Si primary particles from -30 to -6 Rm. The effect of cooling rate was investigated by the use of a mold with different section test bars. The results showed an increase in both UTS and elongation values with reduction in section thicknesses corresponding to increasing cooling rates. Adding Li also raised the tensile strength and elongation values and reduced the number of decohered particles observed in fracture surfaces thereby increasing the alloy's ductility. Data scatter and unexpected low tensile values of 3 mm sections were attributed to casting defects observed in fracture surfaces. Large clusters Of M92 Si particles and eutectic cell boundaries were found to be potential crack propagation paths in this alloy. (c) 2008 Elsevier BX All rights reserved.
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