Characterization investigations of the mechanically alloyed and sequentially milled Al-12.6 wt.% Si eutectic alloy powders

This study reports on the detailed microstructural characterization of Al-12.6 wt.% Si eutectic alloy powders synthesized from Al and Si elemental starting materials via mechanical alloying (MA) for 4, 6, and 8 h, and subsequent cryomilling (CM). Mechanically alloyed (MA'd) powders were cryomil...

Full description

Saved in:
Bibliographic Details
Published in:Particulate science and technology 2020-01, Vol.38 (1), p.15-22
Main Authors: Tekoglu, Emre, Agaogullari, Duygu, Lütfi Öveçoglu, M
Format: Article
Language:English
Subjects:
Al-Si eutectic powder alloys
Alloy development
Alloy powders
cryomilling
Crystallites
Eutectic alloys
Mapping
Mechanical alloying
microstructural characterization
Silicon
Solid solubility
Stainless steels
thermal properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This study reports on the detailed microstructural characterization of Al-12.6 wt.% Si eutectic alloy powders synthesized from Al and Si elemental starting materials via mechanical alloying (MA) for 4, 6, and 8 h, and subsequent cryomilling (CM). Mechanically alloyed (MA'd) powders were cryomilled (CM'd) for 10, 20, and 30 min in a freezer/mill using liquid N 2 gas circulated externally around the polycarbonate milling vial containing stainless steel rods. SEM/EDS and TEM/EDS mapping analyses revealed the presence of some Si embedded in the Al-rich particles and some existed as free Si. As expected, with increasing MA and sequential milling (MA + CM) duration, strain values increased and crystallite sizes decreased. Si solubility in α-Al was enhanced with increasing MA durations and utilizing MA and CM consecutively (sequential milling) as indicated by DSC endothermic and XRD peak shifts. A maximum solubility of 2.25 at.% Si in α-Al or Si solid solubility extension of 0.65 at.% was estimated for the Al12.6Si eutectic alloy powders MA'd for 8 h.
ISSN:0272-6351
1548-0046
DOI:10.1080/02726351.2018.1481899