Microwave Irradiation Process for Al–Sc Alloy Production

Satoshi Fujii, Eiichi Suzuki, Naomi Inazu, Shuntaro Tsubaki, Jun Fukushima, Hirotsugu Takizawa, Yuji Wada

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Scandium is being explored as an alloying element for aluminium alloys, which are gaining importance as high-performance lightweight structural alloys in the transportation industry. Sc-rich ScAlN thin films show strong piezoelectricity and can be fabricated on a hard substrate for use as wideband surface acoustic wave filters in next-generation wireless mobile communication systems. However, the use of ScAlN thin films in microelectromechanical system devices is limited by the high cost of metallic Sc, which is due to the difficulty in smelting of this material. Here, we propose a novel microwave irradiation process for producing Al-Sc alloys, with Mg ions as a reducing agent. Although scandium oxide is thermodynamically stable, intermetallic Al3Sc is obtained in high yield (69.8%) via a low-temperature (660 °C) reduction reaction under microwave irradiation. Optical spectroscopy results and thermodynamic considerations suggest a non-thermal equilibrium reaction with the univalent magnesium ions excited by microwave irradiation.

Original languageEnglish
Article number2689
JournalScientific Reports
Issue number1
Publication statusPublished - 2020 Dec 1


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