Paper Title:
Microstructural Morphology and Phase Structure of Rapidly Solidified Hypereutectic Al-Si Alloys
  Abstract

In the present work, rapidly solidified hypereutectic Al-Si-Cu-Mg alloys strips was prepared by single roller melt-spinning method. The microstructures, phase and morphology characteristics of the resultant strips were characterized by means of SEM, TEM and XRD technique. The results show that the grains are refined after rapid solidification processing, and the micro-nanocrystals are formed. Compared with equilibrium solidification, the microstructures are changed obviously. The nucleation and growth of primary silicon are suppressed and primary silicon can not deposited, meanwhile, α-Al phase is nucleated which prior to eutectic. Therefore, the microstructures become into the metastable state. The microstructures of the strips are composed of primary micro-nanostructure α phase and feather-needles-like (α+Si) eutectic which set in the α phase. The mechanism of the formation for microstructures of melt-spinning Al–Si alloy have also been discussed.

  Info
Periodical
Advanced Materials Research (Volumes 79-82)
Edited by
Yansheng Yin and Xin Wang
Pages
139-142
DOI
10.4028/www.scientific.net/AMR.79-82.139
Citation
A. Q. Wang, J. W. Li, J. P. Xie, W. Y. Wang, "Microstructural Morphology and Phase Structure of Rapidly Solidified Hypereutectic Al-Si Alloys", Advanced Materials Research, Vols. 79-82, pp. 139-142, 2009
Online since
August 2009
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$32.00
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