Formation of Periodic Structures in Enforced Solid Solution of Al-Cu Alloys

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  • Sato Tatsuo
    Department of Metallurgical Engineering, Faculty of Engineering, Tokyo Institute of Technology
  • Long Than Trong
    Graduate Student, Tokyo Institute of Technology
  • Tezuka Hiroyasu
    Department of Metallurgical Engineering, Faculty of Engineering, Tokyo Institute of Technology
  • Kamio Akihiko
    Department of Metallurgical Engineering, Faculty of Engineering, Tokyo Institute of Technology
  • Takahashi Tsuneo
    Department of Metallurgical Engineering, Faculty of Engineering, Tokyo Institute of Technology

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Other Title
  • Al-Cu合金強制固溶体における周期構造の形成
  • Al Cu ゴウキン キョウセイ コヨウタイ ニ オケル シュウキ コウゾウ

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Abstract

Ribbon-shaped thin samples of the enforced solid solution of Al-Cu alloys (10-33 mass%Cu) were obtained by the rapid solidification using a rotating single roller technique, and the decomposition process of the enforced solid solution and the formation behavior of the periodic structures were investigated with a high resolution electron microscope (HREM).<BR>The solid solutions of Al-10, 15 and 20 mass%Cu alloys decompose rapidly by the aging heat treatment, and the characteristic periodic structure in which the Cu concentration changes periodically in the ⟨100⟩ direction with the spacing of about 0.8 nm was formed over a wide region of the alloys. The periodic structure grows gradually with aging time in the longitudinal direction keeping the spacing constant, and is replaced by the intermediate θ′ phase at the later stage of aging. With increasing aging temperature, the fine periodic structure changes into a more coarsened one, and above a critical temperature no periodic structure is formed. In Al-25 and 33 mass%Cu alloys, finer periodic structures are formed rapidly during solidification.<BR>Through the continuous HREM observation of the same regions in specimens, the aging condition as well as the formation process in which the periodic structure is formed is clarified.

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