Particle-stimulated nucleation and recrystallization texture initiated by coarsened Al2CuLi phase in Al–Cu–Li alloy

Abstract

The particles stimulated nucleation (PSN) triggered by coarsened T1 phase (Al2CuLi) in Al–Cu–Li alloys is investigated to analyze the formation of recrystallization texture that is unusual from typical PSN. The specimens were uniaxially compressed to a series of compression amount and the recrystallization process is characterized by electron backscattered diffraction (EBSD), scanning electron microscope (SEM) and transmission electron microscope (TEM). Results showed that the recrystallization occurred by progressive rotation of the matrix units that separated by the three-dimensional arranged T1 precipitates. The rotation of the units towards was observed in the initial grains of various orientations all through the recrystallization process. The massively formed fine grains contribute to a strong fiber texture. The fraction of recrystallization is 67% and the grains are averagely 2.5 μm in the specimen received a stain of 1.61. The PSN initiated by coarsened T1 phase fosters the feasibility to obtain textured and refined structure in Al–Cu–Li alloys which will facilitate the performance improvement of the fabricated components.

Keywords

• Aluminum alloys
• Particles stimulated nucleation (PSN)
• Recrystallization texture