کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
796394 | 1466781 | 2007 | 6 صفحه PDF | دانلود رایگان |
The effect of the type of SiCp (green or black), Mg content in the aluminum alloy and holding time on the microstructure and impact strength of Al/SiCp composites fabricated by pressureless infiltration was investigated. Preforms of SiCp in the form of rectangular bars (10 cm × 1 cm × 1 cm) were infiltrated at 1150 °C in argon → nitrogen atmosphere for 45 and 60 min utilizing two aluminum alloys (Al–6Mg–11Si and Al–9Mg–11Si) (wt.%). Results show that the presence of a higher amount of black SiC has a beneficial effect in the composites microstructure because it prevents formation of the unwanted Al4C3 phase. The impact strength is enhanced when the Mg content varies from 6 to 9 wt.% and decreases when the Al4C3 phase is present. Moreover, a higher amount of Mg in the alloy is reflected in a lower residual porosity and consequently in a higher impact strength in the composites.
Journal: Journal of Materials Processing Technology - Volume 183, Issues 2–3, 23 March 2007, Pages 368–373