ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Intermetallic phases formed during directional Bridgman solidification of a 6xxx seriesAl alloy in the growth velocity range 5-120 mm/min have been characterised using conventionaland high-resolution transmission electron microscopy. Cubic αc-AlFeSi and β-AlFeSi were alwayspresent in the alloy, but Al13Fe4 was only observed at 5mm/min and monoclinic αT-AlFeSi at 80mm/min. Cubic αc-AlFeSi was observed to have a variety of morphologies resulting from flexibilityin its growth mechanisms. β-AlFeSi with twins and faults showed strongly anisotropic growth bysteps, resulting in its platelet morphology. Occasionally blocky β-AlFeSi particles were observedparticularly at 30-60 mm/min, suggesting that other mechanisms could influence their morphology.Two types of composite particles, β-AlFeSi/Al13Fe4 and β-AlFeSi/cubic αc-AlFeSi, were observedin this alloy, and likely formed by two quasi-peritectic reactions
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1721.pdf
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