Modification and Refinement of Cast Al-Si Alloys
Document Type
Book Chapter
Publication Date
3-1-2013
Department
Department of Materials Science and Engineering
Abstract
In the Al-Si system, minor additions of metallic impurities, Na, Sr and others, modify the microstructure of eutectic and primary silicon by inducing a high twin density, causing a morphological transition from flake-like to fibrous or spherical shapes. This modification should be distinguished from the inoculation or refining effects of other minor impurities, notably of phosphorous. The modified structural transition can be entirely explained in terras of growth kinetics modified by impurity induced twinning for the silicon phase and numerical modelling of the cooling curves shows that there need be no change in the nucleation behavior. The presence of elements such as phosphorous complicates the picture because in contrast to the former growth controlled process, the latter probably do alter the nucleation kinetics.
Publication Title
Essential Readings in Light Metals
ISBN
9781118635711
Recommended Citation
Lu, S.,
&
Hellawell, A.
(2013).
Modification and Refinement of Cast Al-Si Alloys.
Essential Readings in Light Metals,
3, 420-424.
http://doi.org/10.1002/9781118647783.ch52
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/3406
Publisher's Statement
© 2013 The Minerals, Metals & Materials Society. All rights reserved. Publisher’s version of record: https://doi.org/10.1002/9781118647783.ch52