Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 23, Issue 2, Pages 611-621Publisher
SPRINGER
DOI: 10.1007/s11665-013-0757-y
Keywords
aluminum alloys; automotive; cooling rate; grain refinement; mechanical properties; microstructure; solidification
Categories
Funding
- Teksid Aluminum Spa (Carmagnola, Italy)
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The effect of AlTi5B1 grain refinement and different solidification rates on metallurgical and mechanical properties of a secondary AlSi7Cu3Mg alloy is reported. While the Ti content ranges from 0.04 up to 0.225 wt.%, the cooling rate varies between 0.1 and 5.5 A degrees C/s. Metallographic and thermal analysis techniques have been used to quantitatively examine the macro- and microstructural changes occurring with grain refiner addition at various cooling rates. The results indicate that a small AlTi5B1 addition produces the greatest refinement, while no significant reduction of grain size is obtained with a great amount of grain refiner. On increasing the cooling rate, a lower amount of AlTi5B1 master alloy is necessary to produce a uniform grain size throughout the casting. The combined addition of AlTi5B1 and Sr does not produce any reciprocal interaction or effect on primary alpha-Al and eutectic solidification. The grain refinement improves the plastic behavior of the alloy and increases the reliability of castings, as evidenced by the Weibull statistics.
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