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<p>Multidimensional synchrotron high-energy microbeam diffraction was applied to a nanostructured Al–1.1Cu–6.8Li–0.8X alloy (at%; X contains a total of minor elements) upon a constant heating ramp from room temperature to 830&#xa0;K. Crystallography of a T<sub>1</sub> precursor intermetallic as well as the T<sub>2</sub> phase has been identified. Radial and azimuthal reciprocal space dimensions have been analyzed to determine Laue–Bragg interferences and their orientational statistics. The residual stress and texture determine the initial nanostructure of an&#xa0;ultrafine-grained cubic close-packed solid solution. While stress relaxes first, precipitation of precursor T<sub>1</sub> sets in before any recrystallization, leading to nanoscale plate-shaped precipitates in the nanograins. Inherent with the onset of recrystallization, the T<sub>2</sub> phase appears and grows by transformation from T<sub>1</sub> and further precipitation from the matrix. At higher temperatures, T<sub>2</sub> slowly dissolves again, while recrystallization ends and sluggish grain growth occurs in the two-phase field. The latter is accelerated toward the disappearance of T<sub>2</sub> and becomes unhindered once the phase is fully dissolved. All these events mark anomalies in the curves for total lattice strain, small-momentum-transfer signals, and peak widths. The morphology of reflections on the Debye–Scherrer rings allows for determining grain sizes, which have been validated by electron microscopy and diffraction.</p> Graphical abstract <p></p>

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Recrystallization-accelerated precipitation, structural evolution, and residual stress relaxation in nanostructured Al–Cu–Li alloy: an in situ microbeam synchrotron high-energy X-ray diffraction study

  • 期刊论文

  • 发表日期：

    2025年8月31日

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  • Klaus-Dieter Liss,
  • Naoki Takata,
  • Wenyuan Wang,
  • Megumi Kawasaki

摘要

Multidimensional synchrotron high-energy microbeam diffraction was applied to a nanostructured Al–1.1Cu–6.8Li–0.8X alloy (at%; X contains a total of minor elements) upon a constant heating ramp from room temperature to 830 K. Crystallography of a T1 precursor intermetallic as well as the T2 phase has been identified. Radial and azimuthal reciprocal space dimensions have been analyzed to determine Laue–Bragg interferences and their orientational statistics. The residual stress and texture determine the initial nanostructure of an ultrafine-grained cubic close-packed solid solution. While stress relaxes first, precipitation of precursor T1 sets in before any recrystallization, leading to nanoscale plate-shaped precipitates in the nanograins. Inherent with the onset of recrystallization, the T2 phase appears and grows by transformation from T1 and further precipitation from the matrix. At higher temperatures, T2 slowly dissolves again, while recrystallization ends and sluggish grain growth occurs in the two-phase field. The latter is accelerated toward the disappearance of T2 and becomes unhindered once the phase is fully dissolved. All these events mark anomalies in the curves for total lattice strain, small-momentum-transfer signals, and peak widths. The morphology of reflections on the Debye–Scherrer rings allows for determining grain sizes, which have been validated by electron microscopy and diffraction.

Graphical abstract