Strength-ductility behaviour of Al-Si-Cu-Mg casting alloys in T6 temper

Caceres, C. H., Svensson, I. L. and Taylor, J. A. (2003) Strength-ductility behaviour of Al-Si-Cu-Mg casting alloys in T6 temper. International Journal of Cast Metals Research, 15 5: 531-543.

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Author Caceres, C. H.
Svensson, I. L.
Taylor, J. A.
Title Strength-ductility behaviour of Al-Si-Cu-Mg casting alloys in T6 temper
Journal name International Journal of Cast Metals Research   Check publisher's open access policy
ISSN 1364-0461
Publication date 2003
Sub-type Article (original research)
Open Access Status File (Author Post-print)
Volume 15
Issue 5
Start page 531
End page 543
Total pages 13
Place of publication Sheffield, England
Publisher Castings Technology Int
Collection year 2003
Language eng
Subject C1
291403 Alloy Materials
671001 Structural metal products
Abstract A comparative study of the mechanical properties of 20 experimental alloys has been carried out. The effect of different contents of Si, Cu, Mg, Fe and Mn, as well as solidification rate, has been assessed using a strength-ductility chart and a quality index-strength chart developed for the alloys. The charts show that the strength generally increases and the ductility decreases with an increasing content of Cu and Mg. Increased Fe (at Fe/Mn ratio 0.5) dramatically lowers the ductility and strength of low Si alloys. Increased Si content generally increases the strength and the ductility. The increase in ductility with increased Si is particularly significant when the Fe content is high. The charts are used to show that the cracking of second phase particles imposes a limit to the maximum achievable strength by limiting the ductility of strong alloys. The (Cu + Mg) content (at.%), which determines the precipitation strengthening and the volume fraction of Cu-rich and Mg-rich intermetallics, can be used to select the alloys for given strength and ductility, provided the Fe content stays below the Si-dependent critical level for the formation of pre-eutectic alpha-phase particles or beta-phase plates.
Keyword Al-si-cu-mg Casting Alloys
Alloy A356
Alloy A319
Tensile Strength
Tensile Ductility
Quality Index
Damage Mechanisms
Fe-rich Intermetallics
Metal Matrix Composites
Silicon Particles
Metallurgy & Metallurgical Engineering
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 02:44:02 EST