Chapter 11. Directed Nitridation of Liquid Aluminum Alloy: Growth Process and Modeling
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1993 The American Ceramic Society
Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10
How to Cite
Kagawa, Y., Khatri, S. C. and Koczak, M. J. (1993) Directed Nitridation of Liquid Aluminum Alloy: Growth Process and Modeling, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314234.ch11
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1993
Print ISBN: 9780470375273
Online ISBN: 9780470314234
- additive element;
- liquid aluminum alloys
The nitridation of AI-Si-Mg alloys was carried out at temperatures ranging from 970 to 1373 K under high purity nitrogen gas atmosphere. The nitridation process is divided into three characteristic stages. Stage I corresponds to formation of a porous AIN layer above the liquid aluminum alloy. After stage I, bulk AINIAI-Si alloy composite forms and the nitridation rate shows the maximum value. The nitridation rate at stage II is constant. During stage III, the nitridation rate constantly decreases. The decreased nitridation rates are due to increased melt viscosity, higher diffusion distances for aluminum and depletion of aluminum alloy reservoir. In this paper, experimental evidence of the growth process and a preliminary analysis are presented.