期刊
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
卷 44A, 期 1, 页码 388-394出版社
SPRINGER
DOI: 10.1007/s11661-012-1388-x
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资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) via the Aluminum Research Centre-REGAL
- Fonds de Recherche du Quebec - Nature et Technologies (FRQ-NT) via the Aluminum Research Centre-REGAL
The mechanism of heterogeneous grain refining of aluminum by ultrafine elemental boron particles was investigated. In order to facilitate the observation of the boron-aluminum interface, a boron filament was introduced in a melt at 1013 K (740 degrees C) containing different levels of Ti. The Al/B interface was studied using transmission electron microscopy and different phases were identified using the electron diffraction method. The experimental results showed that boron is dissolved in pure aluminum while its dissolution is inhibited in presence of titanium solute. A thin layer of TiB2 formed at the surface of boron thickens with residence time in the melt. The mechanisms by which aluminum is crystallized on boron are discussed. DOI: 10.1007/s11661-012-1388-x (C) The Minerals, Metals & Materials Society and ASM International 2012
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