Effect of Bimodal Quasicrystal Phase on the Dynamic Recrystallization of Mg-Zn-Gd Alloy during High-Pressure Torsion

doi:10.1007/s40195-024-01687-z

Abstract

Abstract:

The Mg–Zn–Gd alloy with quasicrystal icosahedral phase was processed by high-pressure torsion (HPT). The effect of bimodal I-phase on the dynamic recrystallization was analyzed by transmission electron microscopy. The results showed that the block I-phase can stimulate obvious particle-stimulated nucleation and dynamic recrystallization (DRX) grains were preferentially formed after HPT for 5 turns, while the granular I-phase only promoted the generation of sub-grains. The orientation relationship was determined as twofold//[12$\overline{1 }$0] and fivefold//(0002)_Mg. Moreover, after HPT for 9 turns, the DRX grains induced by block I-phase appeared to grow up and coarsened. Compared with block I-phase, the grains induced by granular I-phase presented much smaller size and distributed more homogeneous due to the strong pinning effect.

Key words: High-pressure torsion (HPT), Quasicrystal phase, Dynamic recrystallization, Particle-stimulated nucleation, Orientation relationship

Ping Li, Shuangwu Xia, Junfu Dong, Liangwei Dai, Zhicheng Luo, Kemin Xue. Effect of Bimodal Quasicrystal Phase on the Dynamic Recrystallization of Mg-Zn-Gd Alloy during High-Pressure Torsion[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(7): 1128-1134.

Figures/Tables 5

Fig. 1 TEM images of HPT for 5 turns: a Mg matrix; b SAED for Mg matrix; c Block I-phase; d SAED for block I-phase; e the region near to granular I-phase; f the region between block and granular I-phase

Fig. 2 a, c HRTEM for the interface between the I-phase and matrix after HPT for 5 turns and 9 turns, respectively; b FFT of I-phase after HPT for 5 turns; d SAED of Mg matrix after HPT for 9 turns

Fig. 3 a TEM image of Mg-Zn-Gd alloy after HPT for 9 turns; b STEM for a; c, d distribution histogram of DRX grains (corresponding to yellow and white dashed rectangle in b) induced by block and granular I-phase, respectively

Fig. 4 Schematic of dynamic recrystallization behavior induced by PSN: a initial state of HPT process; b HPT for 5 turns; c HPT for 9 turns

Table 1 Driving force and Zener drag force of recrystallization induced by I-phase

Precipitate	Size (nm)	$F_{{\text{c}}}$ (${\text{N m}}^{ - 2}$)	$F_{{\text{p}}}$ (${\text{N m}}^{ - 2}$)	$F$ (${\text{N m}}^{ - 2}$)
Block I-phase	234	2.02 $\times 10^{5}$	0.77 $\times 10^{5}$	1.25 $\times 10^{5}$
Block I-phase	737		0.25 $\times 10^{5}$	1.77 $\times 10^{5}$
Nanoscale I-phase	102		1.54 $\times 10^{5}$	0.48 $\times 10^{5}$

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