Effects of ultrasonic treatment on the formation of iron-containing intermetallic compounds in Al-12%Si-2%Fe alloys |
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| Affiliation: | 1. Materials Science and Engineering, Arizona State University, Tempe, AZ 85287, United States;2. Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ 85287, United States;3. Los Alamos National Laboratory, MS E536, Los Alamos, NM 87545, United States;1. Department of Applied Science, University of Québec at Chicoutimi, Saguenay (QC), Canada G7H 2B1;2. Arvida Research and Development Centre, Rio Tino Alcan, Saguenay (QC), Canada G7S 4K8;1. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China;2. Ningbo Institute of Dalian University of Technology, Ningbo, 315016, China;3. School of Iron and Steel, Soochow University, Suzhou, 215006, China;4. Key Laboratory of Lightweight Structural Materials (Liaoning Province), School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China;1. Key Laboratory of Lightweight Structural Materials (Liaoning Province), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, PR China;2. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, PR China;3. School of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, China;4. School of Engineering, Bohai University, Jinzhou 121007 PR China;1. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China;2. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan, 114000, China;3. Key Laboratory of Lightweight Structural Materials (Liaoning Province), School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China;4. Ningbo Institute of Dalian University of Technology, Ningbo, 315000, China;1. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany;2. European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France;3. Univ. Grenoble Alpes, CNRS, SIMaP, F-38000 Grenoble, France |
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| Abstract: | In general, the iron impurity is detrimental to the mechanical properties of Al–Si alloys. The α-phase and β-phase are the most important and common iron-containing intermetallic compounds (IMCs) in Al–Si alloys. During conventional casting, the acicular β-phase is stable, and considered to be harmful. In this paper, the Al-12%Si-2%Fe alloy was treated by power ultrasound and solidified under different cooling conditions. The effects of ultrasonic treatment (UST) and cooling rate on morphology and composition of IMCs were investigated. The results showed that UST can change the morphology and composition of iron-containing IMCs and promote the formation of metastable α-phase. When the ultrasound was applied at 720 °C, the amount of starlike α-phase increases and the acicular β-phase decreases with increasing applied time of UST. In addition, the polygonal α-phase is formed and substitutes for the β-phase when quenching after UST for 60 s and 120 s, suggesting that the formation of β-phase can be suppressed under this condition. For the case of UST at 610 °C which the β-phase has been nucleated, the β-phase transforms from an acicular shape to the rod-like morphology, indicating that the cavitation-induced fracture of β-phase. |
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| Keywords: | A Intermetallics miscellaneous B Phase transformation D Microstructure F Electron microprobe |
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