Influence of the extrusion parameters on the microstructure and propertiesof an Al-Si alloy

Citation
A. Pyzalla et al., Influence of the extrusion parameters on the microstructure and propertiesof an Al-Si alloy, Z METALLKUN, 91(10), 2000, pp. 831-837
Citations number
23
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science",Metallurgy
Journal title
ZEITSCHRIFT FUR METALLKUNDE
ISSN journal
00443093 → ACNP
Volume
91
Issue
10
Year of publication
2000
Pages
831 - 837
Database
ISI
SICI code
0044-3093(200010)91:10<831:IOTEPO>2.0.ZU;2-O
Abstract
The influence of the extrusion temperature and the extrusion speed on the m icrostructure, the texture and the residual stresses in AlSi25Cu4Mg1 after indirect extrusion has been studied using microscopical, X-ray and high-ene rgy synchrotron X-ray methods. The texture of the extrudates depends strong ly on the billet temperature and also is influenced by the speed of extruda tes. The residual stress state in the bulk of the extrudates essentially is determined by temperature gradients across the diameter and differences in the thermal expansion of the aluminium matrix and the silicon particles. T he extrudates processed with a billet temperature of 450 degreesC have a hi gher strength and lower formability than the extrudates processed with a bi llet temperature of 300 degreesC, which is not a texture effect but due to a finer precipitate size in the aluminium matrix.