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Two-step homogenisation was applied to a 6xxx alloy containing Zr to enhance the characteristics of Zr-bearing dispersoids and recrystallization resistance. The two-step homogenisation treatments were composed of a first step at 400 °C for 48 h and a second step at 500 °C for 2 and 5 h and compared with single-step homogenisation conducted at 500 °C for 2 and 5 h. The dispersoid microstructure was characterised using optical microscopy and scanning and transmission electron microscopies. The thermomechanical simulator Gleeble 3800 was used to conduct the hot compression tests at 350°C/1.0s −1 . To study the recrystallization resistance, post-deformation annealing at 500 °C for 1 h was performed on the deformed samples. The grain structure after deformation and annealing was characterised based on the EBSD technique. The results showed that compared to single-step homogenisation, the dispersoid characteristics were significantly improved using two-step homogenization, where the number density of L1 2 -Al 3 Zr dispersoids increased by 75–145% while their size decreased by 9–25% and the distribution of the DO 22 -(Al, Si) 3 (Zr,Ti) dispersoids became more uniform. The improved characteristics of Zr-bearing dispersoids and the narrower dispersoid-free zones produced by the two-step homogenization significantly improved the recrystallization resistance with a reduction in the recrystallized area fraction reached 85% when compared with single-step homogenisation.

Improving the dispersoid distribution and recrystallization resistance of a Zr-containing 6xxx alloy using two-step homogenization