Study on the Natural Convection and Formation of Periodic Diphase Dendrite in Al-La Alloys

Abstract:

In the crystal growth process, the temperature distribution and concentration distribution at the solid-liquid interface edge are always the hot problems. In this paper, we study the concentration distribution at the solid-liquid interface edge under the natural convection conditions, we find that the concentration field is oscillating exponential decline or rose along the crystal growth direction. We also study the dendrite morphology of Al-La alloys using the experimental method, the results show that the microstructure of Al-35%La alloys is different from the common microstructure of hypereutectic alloy during the conventional casting process, the first crystalline phase is Al11La3, which composition is discontinuous along the growth direction, the main dendrite is composed of α-Al alternating with Al11La3, the results of SEM and XRD show that the chemical composition along the main dendrite exhibits periodic behavior, therefore, this microstructure is named as periodic diphase dendrite structure.

• Periodical: Advanced Materials Research (Volumes 129-131)
• Pages: 1308-1312
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.129-131.1308
• Online since: August 2010
• Authors: Ya Hong Zheng, Yan Lin Wang, Zi Dong Wang
• Keywords: Al-La Alloys, Natural Convection, Periodic Diphase Dendrite

References

[1] J. W. Garvin, H. S. Udaykumar: Journal of Crystal Growth. Vol. 252 (2003), p.467.

[2] M. W. Chen, Z. D. Wang, J. J. Xu: Science in China Series E: Technological Sciences. Vol. 51 (2008), p.225.

[3] G. P. Ivantsov: Dokl Akad Nauk USSR. Vol. 58 (1947), p.567.

[4] J. S. Langer, H. K. Muller: Acta Metal. Vol. 26 (1978), p.1681.

[5] M. Kruskal, H. Segur: Stud in Appl Math. Vol. 85 (1991), p.129.

[6] J. J. Xu: Phys Rev A. Vol. 43 (1991), p.930 ____________ Corresponding author: Wang Zidong, male, Ph. D, professor; Zheng Yahong, female, Ph. D candidate; Wang Yanlin, male, Ph. D candidate.