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

doi:10.1007/s40195-021-01308-z

Abstract

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

Ying-Xi Li, Fan-Qiang Meng, Rui Yuan, Guo-Qiang Huang, Dong-Bai Sun. Devitrification of Al-Ce Amorphous Ribbon Investigated Using In situ High Energy X-ray Diffraction[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(1): 157-162.

Figures/Tables 6

Fig. 1 a BF-TEM image of as-spun ribbon with corresponding diffraction patterns; b and c high-resolution STEM images of spherical big cubic phase (BCP) crystals with corresponding FFT patterns taken under different zone axes

Fig. 2 Accumulated HEXRD patterns as a function of temperature during isochronal heating at a constant rate of 10 °C/min and corresponding DSC trace was imposed

Fig. 3 a Representative HEXRD pattern obtained at 220 °C, b schematic illustration of BCP phase, c-f BF-TEM and HAADF-STEM images of microstructure; (obs: experimental data; calc: calculated pattern; diff: difference between experimental data and calculated one)

Fig. 4 a Representative HEXRD pattern obtained at 270 °C, b schematic illustration of BCP phase, c-f BF-TEM and HAADF-STEM images of BTP phase

Fig. 5 HEXRD pattern of Al-Ce ribbon obtained at 330 °C

Fig. 6 Atomic packing of a 1-6-6-6-1, b 3-6-6-1 motifs

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