Paper Title:
Electron Back Scattering Diffraction Analysis of A357 Alloy Modified by Sr
  Abstract

Microstructure of A357 alloy modified by Sr has been investigated by the Electron Back Scattering Diffraction (EBSD) mapping technique using a Field Emission Gun Scanning Electron Microscopy (FEG-SEM). An appropriate sample preparation technique by ion milling was applied to obtain a sufficiently smooth surface for EBSD mapping. Results show that the eutectic morphology in microstructure of A357 alloy modified by Sr was changed to fine fibrous, and the grain size was refined. By comparing the orientation of the aluminum in the eutectic to that of the primary aluminum dendrites, the nucleation and growth mechanism of the eutectic solidification in A357 cast alloy was determined. The eutectic Si phase of the modified sample nucleates on the heterogeneous nuclei located in the region between primary α-Al dendrites and grows up, while the eutectic Si phase of the sample without modification nucleates on the primary α-Al dendrites and grows up.

  Info
Periodical
Advanced Materials Research (Volumes 160-162)
Edited by
Guojun Zhang and Jessica Xu
Pages
831-835
DOI
10.4028/www.scientific.net/AMR.160-162.831
Citation
Z. W. Chen, H. F. Zhang, J. C. Zhao, "Electron Back Scattering Diffraction Analysis of A357 Alloy Modified by Sr", Advanced Materials Research, Vols. 160-162, pp. 831-835, 2011
Online since
November 2010
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Price
$32.00
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