Acta Metallurgica Sinica (English Letters) ›› 2022, Vol. 35 ›› Issue (1): 157-162.DOI: 10.1007/s40195-021-01308-z

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Devitrification of Al-Ce Amorphous Ribbon Investigated Using In situ High Energy X-ray Diffraction

Ying-Xi Li1, Fan-Qiang Meng1(), Rui Yuan1, Guo-Qiang Huang1, Dong-Bai Sun2()   

  1. 1Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai, 519082, China
    2School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China

Abstract:

Metastable phases formed during vitrification or devitrification open an avenue to study the intrinsic structural hierarchy in amorphous materials. The phase transformation sequence of Al89Ce11 amorphous ribbon was investigated using differential scanning calorimetry, in situ high energy X-ray diffraction (HEXRD) and ex situ high-resolution scanning transmission electron microscope. The results reveal the devitrification pathway following the reaction: amorphous → ε-Al60Ce11 +  fcc-Al → η-Al41Ce5 +  fcc-Al → Al11Ce3 +  fcc-Al. It has been found that both ε-Al60Ce11 and η-Al41Ce5 metastable phases have same Ce-centered 1-6-6-6-1 motif, suggesting that the structural motif can be inherited. Formation of metastable phase with large unit cell is related to the short-range orders developed during solidification. Structural heredity provides a new method to tailor the microstructure and properties of Al-based alloys based on genetic mechanism.

Key words: Synchrotron radiation, Amorphous alloys, Crystallization, Phase transformation