Journal
MATERIALS & DESIGN
Volume 31, Issue -, Pages S44-S49Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2009.10.035
Keywords
Cast aluminium alloys; Solution treatment; Microstructure; Diffusion; WDS; Dissolution; Homogenisation
Categories
Funding
- European Project NADIA (New Automotive components Designed for and manufactured by Intelligent processing of light Alloys)
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The influence of solidification rate on the solution treatment response for an Al-8Si-3.1Cu alloy has been investigated. The alloy was cast using the gradient solidification technique to produce samples with three different solidification rates. The samples were solution treated at 495 degrees C for various times between 10 min and 10 h. The concentration of copper in the matrix was measured using the wavelength dispersive spectroscopy technique, WDS. The results show that the coarseness of the microstructure clearly affects the solution treatment time needed to dissolve particles and obtain a homogenous distribution of copper in the matrix. A short solution treatment time of 10 min is enough to achieve a high and homogenous copper concentration for a material with a fine microstructure (secondary dendrite arm spacing, SDAS of 10 mu m), while more than 10 h is needed for a coarse microstructure (SDAS of 50 mu m). A model was developed to describe the dissolution and homogenisation process. The model shows good agreement with the experimental results. (C) 2009 Elsevier Ltd. All rights reserved.
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