Improvement of grain refining performance of Al-Ti refiner by changing the shape of Al3Ti heterogeneous nucleation site particles

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K06875
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Metal making/Resorce production engineering
• Research Institution: Nagoya Institute of Technology
• Principal Investigator: WATANABE Yoshimi 名古屋工業大学, 工学(系)研究科(研究院), 教授 (50231014)
• Co-Investigator(Kenkyū-buntansha): 知場 三周 名古屋工業大学, 工学(系)研究科(研究院), 助教 (10780356) ; 佐藤 尚 名古屋工業大学, 工学(系)研究科(研究院), 准教授 (50402649)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: アルミニウム / 鋳造 / 結晶粒微細化剤 / ヘテロ凝固核 / 界面マッチング / 結晶構造 / 異方性

Outline of Final Research Achievements

It is known that Al3Ti phase in Al-Ti refiner is an effective catalytic substrate for solidification of alpha aluminum. However, since the Al3Ti phase has a tetragonal D022 structure with lattice constants of a = 0.3851 nm and c = 0.8608 nm, different planes of Al3Ti phase have different lattice misfit between aluminum. Moreover, it is reported that the shape of Al3Ti in Al-Ti refiner is platelet and wide plane of the platelet has the relatively large lattice misfit between aluminum. Therefore, the dominant face of Al3Ti platelets in Al-Ti refiner is not the best plane for heterogeneous nucleation. In this study, the effects of morphologies of the Al3Ti particles on refining performance of the Al-Ti refiner is investigated. Improvement of grain refining performance of Al-Ti refiner by changing the shape of Al3Ti heterogeneous nucleation site particles is carried out.

Free Research Field

材料組織学、材料強度学

Academic Significance and Societal Importance of the Research Achievements

アルミニウムの密度は，鉄や銅と比較しておよそ1/3であり，自動車や鉄道を代表とした輸送機器に使用することで，地球温暖化ガス排出量削減が可能である．この為には，アルミニウムおよびその合金の強度向上が望まれおり，一つの解決法として鋳造時の微細化剤添加による組織制御がある．本研究で，Al3Tiヘテロ凝固核による微細化機構の原理原則の一端が究明でき，これを発展させることにより，将来優れた微細化剤を提供することが可能となり，地球温暖化抑制に寄与できる．