Damage by eutectic particle cracking in aluminum casting alloys A356/357

Wang, Q. G., Caceres, C. H. and Griffiths, J. R. (2003) Damage by eutectic particle cracking in aluminum casting alloys A356/357. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 34 12: 2901-2912. doi:10.1007/s11661-003-0190-1


Author Wang, Q. G.
Caceres, C. H.
Griffiths, J. R.
Title Damage by eutectic particle cracking in aluminum casting alloys A356/357
Journal name Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing   Check publisher's open access policy
ISSN 1073-5623
1543-1940
Publication date 2003-12
Sub-type Article (original research)
DOI 10.1007/s11661-003-0190-1
Volume 34
Issue 12
Start page 2901
End page 2912
Total pages 12
Place of publication Boston
Publisher Springer
Collection year 2003
Language eng
Subject C1
291403 Alloy Materials
671001 Structural metal products
Abstract The strain dependence of particle cracking in aluminum alloys A356/357 in the T6 temper has been studied in a range of microstructures produced by varying solidification rate and Mg content, and by chemical (Sr) modification of the eutectic silicon. The damage accumulates linearly with the applied strain for all microstructures, but the rate depends on the secondary dendrite arm spacing and modification state. Large and elongated eutectic silicon particles in the unmodified alloys and large pi-phase (Al9FeMg3Si5) particles in alloy A357 show the greatest tendency to cracking. In alloy A356, cracking of eutectic silicon particles dominates the accumulation of damage while cracking of Fe-rich particles is relatively unimportant. However, in alloy A357, especially with Sr modification, cracking of the large pi-phase intermetallics accounts for the majority of damage at low and intermediate strains but becomes comparable with silicon particle cracking at large strains. Fracture occurs when the volume fraction of cracked particles (eutectic silicon and Fe-rich intermetallics combined) approximates 45 pct of the total particle volume fraction or when the number fraction of cracked particles is about 20 pct. The results are discussed in terms of Weibull statistics and existing models for dispersion hardening.
Keyword Materials Science, Multidisciplinary
Q-Index Code C1

 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 82 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Wed, 15 Aug 2007, 02:43:17 EST