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Heterogeneous nucleation in an Al-Ni-Si alloy studied using a metallic glass technique

journal contribution
posted on 2001-05-31, 00:00 authored by B J McKay, Pavel CizekPavel Cizek, P Schumacher, K A Q O'reilly
Heterogeneous nucleation of α-Al and other phases was investigated in an Al 70 Ni 13 Si 17 (in at. %) alloy, using a novel metallic glass technique. The glass was formed by melt spinning and its devitrification/crystallisation behaviour during isothermal and anisothermal anneals was investigated using differential scanning calorimetry and X-ray diffractometry. The results obtained indicated suitability of the above alloy system for the nucleation study. TiB 2 grain refiner particles were subsequently added to the melt and the melt-spun ribbons produced were examined using transmission electron microscopy. No α-Al nucleation was detected on the boride particles, while it was systematically observed on hexagonal dendrites present in the glassy matrix, which suggests that Si poisoning of the borides is occurring. The high Si content appears to suppress the formation of Al 3 Ti layers on the surface of TiB 2 particles, thus reducing their potency to nucleate α-Al.

History

Journal

Materials science and engineering: A

Volume

304

Issue

306

Pagination

240 - 244

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0921-5093

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2001, Elsevier Science

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