Paper Title:
The Effect of Ni on the High-Temperature Strength of Al-Si Cast Alloys
  Abstract

In order to investigate the effect of Ni on the high-temperature strength of Al-Si cast alloys, tensile properties of hypoeutectic and eutectic alloys were determined at 250 °C after long-term annealing at test temperature. LOM- and SEM-analysis revealed the existence of Al3Ni-phases in close contact to eutectic Si. It was shown that the strength can be increased by the addition of Ni, though just to a certain level, depending on the fraction of eutectic phase in the alloy. The alloys were considered as a coarse two-phase system where a hardening effect is caused by load transfer to the harder phase, which requires a certain connectivity/contiguity of the latter. The paper describes the extent of contiguity of the eutectic as well as the hard silicon and Al3Ni-phases within the eutectic, and discusses their contribution to an enhanced strength of Al-Si alloys at elevated temperatures.

  Info
Periodical
Chapter
Chapter 5: Microstructure and Properties
Edited by
Hajo Dieringa, Norbert Hort and Karl Ulrich Kainer
Pages
274-277
DOI
10.4028/www.scientific.net/MSF.690.274
Citation
F. Stadler, H. Antrekowitsch, W. Fragner, H. Kaufmann, P. J. Uggowitzer, "The Effect of Ni on the High-Temperature Strength of Al-Si Cast Alloys", Materials Science Forum, Vol. 690, pp. 274-277, 2011
Online since
June 2011
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Price
$32.00
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