Paper Title:
Microstructures of Rapidly Solidified Hypereutectic Al-Si Alloy with Low-Titanium Content
  Abstract

In the present work, rapidly solidified alloys strips with Al-0.24Ti and Al-21Si-0.24Ti(in wt.%) were prepared by single roller melt-spinning method. The microstructures, phase and morphology characteristics of the resultant strips were characterized by means of scanning electron microscopy (SEM),transmission electric microscopy (TEM) and XRD technique. The results show that the grains have been refined after rapid solidification processing, and the micro-nanocrystalline grain are formed. The morphology characteristics can be changed. The microstructures of Al-0.24Ti alloys strip are micro-nanostructure α-Al solid solutions which are similar with granular or nodular, the corresponding SAD pattern is rings, it presents characteristic of polycrystal; Compared with equilibrium solidification, the microstructures of hypereutectic Al-Si alloy are changed obviously. They are composed of primary micro-nanostructure α-Al supersaturated solid solution and nanocrystal granular (α+Si) eutectic which set in the supersaturated solid solution. The nucleation and growth of primary silicon are suppressed and primary silicon can not precipitate, meanwhile, α-Al phase is nucleated which prior to eutectic, therefore the microstructures become into the metastable state. The mechanism of the formation for microstructures of melt-spinning alloys has also been discussed.

  Info
Periodical
Materials Science Forum (Volumes 575-578)
Edited by
Jitai NIU, Zuyan LIU, Cheng JIN and Guangtao Zhou
Pages
27-31
DOI
10.4028/www.scientific.net/MSF.575-578.27
Citation
A. Q. Wang, J. P. Xie, Z. X. Liu, J. W. Li, W. Y. Wang, S. Q. Yan, "Microstructures of Rapidly Solidified Hypereutectic Al-Si Alloy with Low-Titanium Content", Materials Science Forum, Vols. 575-578, pp. 27-31, 2008
Online since
April 2008
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 Xin Li, Ming Li, Hui Xin Wang, Zhong Juan Yang
Abstract:The Al-Si eutectic alloy solidified under normal pressure was prepared by vacuum Ar-arc furnace. The alloy solidified under high pressure was...
1020
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
Authors: Bartłomiej Dybowski, Bogusława Adamczyk-Cieślak, Kinga Rodak, Iwona Bednarczyk, Andrzej Kiełbus, Jaroslaw Mizera
Chapter 1: Aluminium and Aluminium Alloys
Abstract:The complex microstructure of as-cast AlSi7Mg alloy has been investigated. Microstructure observations were done using light microscopy,...
3
Authors: Cheng Dong Li, Wen Qiang Si, Mei Zhao, Chuan Hao Sun, Xiao Song Guo
Chapter 3: Metal-Based Materials, Alloys and Metallurgical Technology
Abstract:To increase the industrial applicability of hypereutectic Al-Si alloys, various methods have been used to refine primary silicon. The...
242