Effects of a Small Addition of Cu or Ge on the Microstructure and Mechanical Property of an Al-Si Alloy

Abstract:

In this study, we investigated the effects of a small addition of Cu (0.1%) or Ge (0.1%) on the microstructure and mechanical property of Al-Si alloys. The results are as follows. The size of precipitates in the Cu-added or Ge-added alloys is smaller than that in the binary alloy. The size of the precipitates at the grain boundary in the Cu-added or Ge-added alloys is larger than the size of the precipitates in the binary alloy. However, the number of the precipitates at the grain boundary in the Cu-added and Ge-added alloys is smaller than that in the binary alloy. It was found that a small addition of Cu or Ge has the effect of raising the fatigue strength under repeated tensile loading as well as the tensile strength.

• Periodical: Materials Science Forum (Volumes 519-521)
• Pages: 425-430
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.519-521.425
• Online since: July 2006
• Authors: Keiyu Nakagawa, Teruto Kanadani, Kenich Nakayama, Akira Sakakibara
• Keywords: Aging, Al-Si-Cu, Al-Si-Ge, Fatigue Test, Grain Boundary, Microstructure, Precipitate-Free Zone, Tensile Test, Vacancy

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