Influences of pre-existing Mg17Al12 particles on static recrystallization behavior of Mg-Al-Zn alloys at different annealing temperatures

• Published in: Journal of alloys and compounds 2019-05, Vol.787, p.1104-1109
• Main Authors: Xu, Xin-Yu, Wang, Yu-Fei, Wang, Hui-Yuan, Wang, Tong, Zha, Min, Hua, Zhen-Ming, Wang, Cheng, Jiang, Qi-Chuan
• Format: Article
• Language: English
• Subjects: Dispersions; Magnesium base alloys; Mg-Al-Zn alloys; Nucleation; Particle size distribution; Particle size feature; Precipitates; PSN; Recrystallization; Zinc
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.02.063

The present work revealed a potential to control the static recrystallization kinetics through regulating the feature of pre-existing Mg17Al12 particles in Mg-Al-Zn alloys. The AZ31 (Mg-3Al-1Zn) with rarely dispersoids exhibits the fastest recrystallization rate, while the AZ61 (Mg-6Al-1Zn) with only fine particles (∼100 nm) recrystallizes slower than AZ91 (Mg-9Al-1Zn) containing Mg17Al12 precipitates with scattered size distribution (ranging from less than 100 nm to above 0.6 μm). Especially, we found that coarse Mg17Al12 particles in AZ91 are easier to trigger particle stimulated nucleation (PSN) at 275 °C than 175 °C, which compensates the strong recrystallization inhibition of fine dispersoids, leading to the recrystallization dramatically transforms from retarded to accelerated. [Display omitted] •The precipitate feature notably affects the kinetics of static recrystallization.•Recrystallization of alloys with mixed particle size is sensitive to temperature.•Coarse particles in Mg-9Al-1Zn accelerate recrystallization at high temperature.•The study shows an efficient route to control the static recrystallization process.