Paper Title:
Effect of Sr on the Microstructure and Properties of Hypereutectic Al-20 wt% Si Alloy
  Abstract

The effect of Sr on the microstructures and mechanical properties of Al-20 wt% Si alloys were investigated. The results show that with increasing of the Sr content, the primary silicon firstly changes from polygonal block or large plate to small block, then to large polygonal block, and a large number of honeycomb-like on the primary silicon block. The eutectic silicon firstly changes into a fine start with a long needle-like fibrous or branched further to a short stubby dendrite or worm-like, continuously columnar dendrite α of quantity increase. In addition, with increasing the Sr content, the elongation of alloy increases, but there are ups and downs, the tensile strength changes little after the first sharp increases in hardness is parabola. When the Sr content is between 0.04 wt% and 0.06 wt%, the morphology and mechanical properties is the most ideal.

  Info
Periodical
Advanced Materials Research (Volumes 146-147)
Edited by
Sihai Jiao, Zhengyi Jiang and Jinglong Bu
Pages
454-459
DOI
10.4028/www.scientific.net/AMR.146-147.454
Citation
X. S. Li, A. H. Cai, G. Liu, Y. Zhou, J. J. Zeng, "Effect of Sr on the Microstructure and Properties of Hypereutectic Al-20 wt% Si Alloy", Advanced Materials Research, Vols. 146-147, pp. 454-459, 2011
Online since
October 2010
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