Paper Title:
Morphology of Primary Silicon and its Growth Mechanism in Hypereutectic Al-Si Alloys during Melt Overheating Treatment
  Abstract

The relationships between the morphologies of primary silicon and undissolved silicon particles in melt of Al-Si hypereutectic alloys are studied by holding the melt from 600 to 1100°C and then quench interrupting. The variation of growth process and mechanism of primary silicon is also investigated. The results show that undissolved silicon particles in the melt would become the nuclei of primary silicon precipitated in solidification and there is a close relationship between the shape of primary silicon and undissolved silicon particles. The growth of silicon would follow not only twin plane re-entrant edge (TPRE), but also layer mechanism as well. Meanwhile, the shape of primary silicon also relied on kinetic surroundings, such as solute transportation. At higher overheating temperatures of the melt, the primary silicon takes star-like and tree-like shapes.

  Info
Periodical
Materials Science Forum (Volumes 475-479)
Main Theme
Edited by
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
Pages
2587-2590
DOI
10.4028/www.scientific.net/MSF.475-479.2587
Citation
R. Zhang, Z. L. Zhao, T. W. Huang, L. Liu, "Morphology of Primary Silicon and its Growth Mechanism in Hypereutectic Al-Si Alloys during Melt Overheating Treatment", Materials Science Forum, Vols. 475-479, pp. 2587-2590, 2005
Online since
January 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Li Jia He, Jian Zhong Wang, Jin Gang Qi, Da Qiang Cang
555
Authors: De Hong Lu, Ming Zhou, Shao Sheng Wei, Ye Hua Jiang, Rong Zhou
Abstract:The effect of the temperature at the friction surface on spheroidization and refinement of Si particles in hypereutectic Al-30Si alloys was...
102
Authors: Zheng Liu, Hong Biao Xu, Kai Cao, Mei Yan Huang
Chapter 2: Manufacturing and Design Science
Abstract:Mg2Si reinforced hypereutectic Al-Si in-situ composite was prepared and the effects of the isothermal holding temperature and time...
711
Authors: Ai Qin Wang, Jing Pei Xie, Wen Yan Wang, Luo Li Li
Chapter 1: Material Science
Abstract:In the present work, the Al-21Si-0.8Mg-1.5Cu-0.5Mn alloys composite modified by P+RE was prepared by metal mold casting. The tribological...
28
Authors: Zheng Liu, Xiao Mei Liu
Chapter 3: Material Engineering and Science
Abstract:Alumina/Al-Si alloy composites were manufactured by squeeze casting. The morphology of eutectic Si in the composite was observed on scanning...
3070