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Abstract <p>X-ray diffraction is used to study the texture distribution of the α solid solution and the intermetallic δ' (Al<sub>3</sub>Li) and T<sub>1</sub> (Al<sub>2</sub>CuLi) phases over the cross section of sheets made of 1441, V-1461, and V-1469 alloys (Al–Cu–Li system). The linear thermal expansion coefficient (LTEC) of the solid solution and the δ' phase is determined for each alloy in the temperature range 25—500°C using high-temperature X-ray diffraction. The texture of all sheets is shown to be heterogeneous. A single-component {110}<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\left\langle {112} \right\rangle \)</EquationSource> <!--RusMet2670014Betsofen-m1--> </InlineEquation> brass texture forms in the mid-thickness layer. In the surface layers (up to one-fourth of the sheet thickness), a multicomponent shear texture with predominant {113}⟨110⟩ and {100}⟨110⟩ orientations forms. The orientations of the δ' and T<sub>1</sub> phases in the mid-thickness layer with the brass texture are coherent with the matrix and fully correspond to the orientation relationships characteristic of these phases. The 1441 alloy with Li/Cu = 1.07 has only δ'-phase reflections; the V-1469 alloy with Li/Cu = 0.29, only T<sub>1</sub>-phase reflections; and the V-1461 alloy with Li/Cu = 0.62, reflections from both the δ' and T<sub>1</sub> phases. The LTECs of the α solid solutions in the alloys under study are found to change within 24.8–29.4 ppm/K, and the LTEC of the δ' phase is 16.8 ppm/K.</p>

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Texture Distribution of the Intermetallic δ' and T1 Phases over the Cross Section of Al–Cu–Li Alloy Sheets

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • S. Ya. Betsofen,
  • A. A. Ashmarin,
  • R. Wu,
  • D. A. Prokopenko,
  • E. I. Maksimenko

摘要

Abstract

X-ray diffraction is used to study the texture distribution of the α solid solution and the intermetallic δ' (Al3Li) and T1 (Al2CuLi) phases over the cross section of sheets made of 1441, V-1461, and V-1469 alloys (Al–Cu–Li system). The linear thermal expansion coefficient (LTEC) of the solid solution and the δ' phase is determined for each alloy in the temperature range 25—500°C using high-temperature X-ray diffraction. The texture of all sheets is shown to be heterogeneous. A single-component {110} \(\left\langle {112} \right\rangle \) brass texture forms in the mid-thickness layer. In the surface layers (up to one-fourth of the sheet thickness), a multicomponent shear texture with predominant {113}⟨110⟩ and {100}⟨110⟩ orientations forms. The orientations of the δ' and T1 phases in the mid-thickness layer with the brass texture are coherent with the matrix and fully correspond to the orientation relationships characteristic of these phases. The 1441 alloy with Li/Cu = 1.07 has only δ'-phase reflections; the V-1469 alloy with Li/Cu = 0.29, only T1-phase reflections; and the V-1461 alloy with Li/Cu = 0.62, reflections from both the δ' and T1 phases. The LTECs of the α solid solutions in the alloys under study are found to change within 24.8–29.4 ppm/K, and the LTEC of the δ' phase is 16.8 ppm/K.