Please use this identifier to cite or link to this item: https://hdl.handle.net/11499/8710
Title: The effect of extrusion and high-pressure torsion on the properties of Alumix-231
Authors: Ozdemir, I.
Göde, Ceren
Yilmazer, H.
Çallıoğlu, Hasan
Keywords: Al-Si alloy
EBSD
Extrusion
High-pressure torsion
Mechanical properties
Al-metal
Eutectic silicon
Extrusion ratio
Hardness values
High pressure torsions
Hot extrusion
Morphological changes
Overall properties
Properties and microstructures
Quasihydrostatic pressure
Refined microstructure
Room temperature
Rotation speed
Severe plastic deformations
XRD
Aluminum
Eutectics
High pressure effects
Hydrostatic pressure
Microstructure
Silicon alloys
Torsional stress
Tensile strength
Abstract: The mechanical properties and microstructure of commercial Al-15Si-2.5Cu-0.5Mg (Alumix-231 ®) alloy was subjected to extrusion (EXTR), hot extrusion into rods at 565°C at an extrusion ratio of 4:1 and high-pressure torsion (HPT) processing, one of the most severe plastic deformation (SPD) techniques, with an anvil rotation speed of 0.5rpm under a quasi-hydrostatic pressure of 5GPa. Afterwards, the microstructures of specimens were systematically investigated using XRD, SEM, EBSD, and TEM. Also, tensile properties of Alumix-231 processed by EXTR and HPT were determined at room temperature. The HPT specimen shows refined microstructure (around average 165nm) having more spherical and homogeneously distributed eutectic silicon second phases in Al metal matrix as compared to EXTR specimen. The hardness values are greater on the surface of the HPT specimen (239.1Hv) as compared to that EXTR specimen (71.2Hv) and increase with distance from the center of HPT specimen (198.3Hv). Tensile strength and ductility of HPT specimen increased approximately 2 times than that of EXTR sample, respectively. The results indicate that the morphological changes in eutectic silicon especially after HPT play a critical role in enhancing or limiting the overall properties of the Alumix-231 material. © 2011 Elsevier B.V.
URI: https://hdl.handle.net/11499/8710
https://doi.org/10.1016/j.msea.2011.10.123
ISSN: 0921-5093
Appears in Collections:Denizli Teknik Bilimler Meslek Yüksekokulu Koleksiyonu
Mühendislik Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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