X-Ray Diffraction Study of the Structural Evolution in a Grade 1469 (Al-Cu-Li) Alloy during the Production of Hot-Rolled Sheets

摘要

X-ray diffraction is used to study the structural changes in a grade 1469 (Al-Cu-Li) alloy with a high lithium content that occur during the production of hot-rolled sheets according to the ingot - > pressed strip - > hot-rolled sheet schedule. In the pressed strip, a multicomponent Bs {110}(112), Cu {211 }<111>, and S {123 }<111> texture forms, which is typical of articles pressed from such alloys, and an unusual intense single-component texture of the Ex_1 {011}<111> type forms in the hot-rolled sheets. Its formation is stimulated by cross rolling of the sheets. The low strength characteristics of the hot-rolled sheets after heat treatment are related to an elevated heating temperature used for quenching and to the oriented precipitation of the lamellar particles of the hardening T_1 phase.