Abnormal grain growth induced by <112̄0> orientation of AZ31 magnesium alloy

ABSTRACT

The abnormal grain growth behaviour and preferential orientation of AZ31 Mg alloy were systematically examined. Abnormal grain growth was observed after annealing at 500°C for 9 h, and the grain growth rate was 1.3 mm h⁻¹. Due to the abnormal grain growth, the activation energy of grain growth was reduced from 172 to 104 KJ mol⁻¹. The abnormal grains with <11$\overline{2}$0> orientation grew preferentially, which resulted in the increase of the <11$\overline{2}$0> type texture intensity and the decrease of the <0001>. The energy difference of the misorientation is the main driving force for the formation of abnormal grains with <11$\overline{2}$0> orientation.

KEYWORDS:

• Magnesium
• grain growth
• abnormal grain growth
• texture
• preferential orientation

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The raw/processed data required to reproduce these findings cannot be shared at this time due to legal or ethical reasons.

Additional information

Funding

The work is supported by the Innovation research group of universities in Chongqing [grant number CXQT21030], Chongqing Talents: Exceptional Young Talents Project [grant number CQYC201905100], Chongqing Youth Expert Studio.