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

Emre Tekoğlu; Duygu Ağaoğulları; M. Lütfi Öveçoğlu

doi:10.1080/02726351.2018.1481899

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

Emre Tekoğlu^*, Duygu Ağaoğulları, M. Lütfi Öveçoğlu

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Istanbul Technical University

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

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 N₂ 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.

Original language	English
Pages (from-to)	15-22
Number of pages	8
Journal	Particulate Science and Technology
Volume	38
Issue number	1
DOIs	https://doi.org/10.1080/02726351.2018.1481899
Publication status	Published - 2 Jan 2020

Bibliographical note

Publisher Copyright:
© 2018, © 2018 Taylor & Francis.

Funding

This study was financially supported by the Scientific and Technological Research Council of Turkey (TUBITAK) through a research project entitled “Synthesis of hypoeutectic Al-Si alloy based powders, their sintered composites and hybrid composites reinforced with various boride and carbide particulates by using MA and cryogenic milling techniques and corresponding characterization investigations” with the project number 214M093. This study was financially supported by the Scientific and Technological Research Council of Turkey (TUBITAK) through a research project entitled ?Synthesis of hypoeutectic Al-Si alloy based powders, their sintered composites and hybrid composites reinforced with various boride and carbide particulates by using MA and cryogenic milling techniques and corresponding characterization investigations? with the project number 214M093. The authors gratefully acknowledge use of the services and facilities of the Sel?uk University-Advanced Technology Research and Application Center (ATRAC) for their valuable assistance during TEM analyses.

Funders	Funder number
ATRAC
Sel?uk University-Advanced Technology Research and Application Center
TUBITAK
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu	214M093

Keywords

Al–Si eutectic powder alloys
cryomilling
mechanical alloying
microstructural characterization
thermal properties

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10.1080/02726351.2018.1481899

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

abstract = "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{\textquoteright}d) powders were cryomilled (CM{\textquoteright}d) for 10, 20, and 30 min in a freezer/mill using liquid N2 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{\textquoteright}d for 8 h.",

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AU - Lütfi Öveçoğlu, M.

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N2 - 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 N2 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.

AB - 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 N2 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.

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

Abstract

Bibliographical note

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Keywords

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