Dynamic recrystallization behavior and microstructural evolution of Mg alloy AZ31 through high-speed rolling

doi:10.1016/j.jmst.2018.03.002

材料科学与技术 ›› 2018, Vol. 34 ›› Issue (10): 1747-1755.DOI: 10.1016/j.jmst.2018.03.002

收稿日期:2017-12-11 修回日期:2018-01-15 接受日期:2018-01-31 出版日期:2018-10-05 发布日期:2018-11-01
作者简介:
1These authors contributed equally to this work.2Permanent address: Department of Chemical and Biomolecular Engineering,Institute for Corrosion and Multiphase Technology, Ohio University, Athens, OH45701, USA.

Dynamic recrystallization behavior and microstructural evolution of Mg alloy AZ31 through high-speed rolling

Jeong Hun Lee^a, Jong Un Lee^b, Sang-Hoon Kim^b, Seok Weon Song^c, Chong Soo Lee^d, Sung Hyuk Park^b()

^aUlsan Regional Division, Korea Institute of Industrial Technology, Ulsan 44413, Republic of Korea
^bSchool of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
^cTechnical Research Laboratories, POSCO, Pohang 37859, Republic of Korea
^dGraduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang 37673, Republic of Korea

Received:2017-12-11 Revised:2018-01-15 Accepted:2018-01-31 Online:2018-10-05 Published:2018-11-01

摘要/Abstract

Abstract:

High-speed rolling (HSR) is known to improve the workability of Mg alloys significantly, which makes it possible to impose a large reduction in a single pass without fracture. In the present study, dynamic recrystallization (DRX) behavior and microstructural and textural variations of Mg alloy AZ31 during a HSR process were investigated by conducting rolling with different imposed reductions in the range of 20%-80% at a high rolling speed of 470 m/min and 400 °C. High-strain-rate deformation during HSR suppresses dislocation slips but promotes twinning, which results in the formation of numerous twins of several types, i.e., {10-12} extension twins, {10-11} and {10-13} contraction twins, and {10-11}-{10-12} double twins. After twinning, high strain energy is accumulated in twin bands because their crystallographic orientations are favorable for basal slips, leading to subsequent DRX at the twin bands. Accordingly, twinning activation and twinning-induced DRX behavior play crucial roles in accommodating plastic deformation during HSR and in varying microstructure and texture of the high-speed-rolled (HSRed) sheets. Area fraction of fine DRXed grains formed at the twin bands increases with increasing rolling reduction, which is attributed to the combined effects of increased strain, strain rate, and deformation temperature and a decreased critical strain for DRX. Size, internal strain, and texture intensity of the DRXed grains are smaller than those of unDRXed grains. Therefore, as rolling reduction increases, average grain size, stored internal energy, microstructural inhomogeneity, and basal texture intensity of the HSRed sheets gradually decrease owing to an increase in the area fraction of the DRXed grains.

Key words: Magnesium alloy, High-speed rolling, Twinning, Dynamic recrystallization, Microstructure

. [J]. 材料科学与技术, 2018, 34(10): 1747-1755.

Jeong Hun Lee, Jong Un Lee, Sang-Hoon Kim, Seok Weon Song, Chong Soo Lee, Sung Hyuk Park. Dynamic recrystallization behavior and microstructural evolution of Mg alloy AZ31 through high-speed rolling[J]. J. Mater. Sci. Technol., 2018, 34(10): 1747-1755.

图/表 10

Fig. 1. Microstructural characteristics of initial material: (a) inverse pole figure map, (b) (0002) pole figure, and (c) grain size distribution.

Table 1 Process parameters of high-speed rolling and microstructural characteristics of high-speed-rolled (HSRed) samples with different reductions.

Rolling reduction	Processing parameters		Microstructural characteristics
Rolling reduction	Strain	Strain rate (s^-1)	f_DRX (%)	d_avr (μm)	d_DRX (μm)	d_unDRX (μm)	I_max
20%	0.22	91	16.1	20.9 (14.2)	5.0 (2.4)	23.9 (13.5)	14.0
40%	0.51	128	50.2	11.6 (12.9)	4.3 (2.1)	18.9 (14.9)	13.3
60%	0.92	157	63.8	6.7 (6.4)	3.9 (2.0)	11.4 (8.3)	12.1
80%	1.61	181	95.2	3.4 (1.5)	3.3 (1.3)	5.0 (2.1)	11.3

Fig. 2. Optical micrographs on (a-d) RD-ND and (e-h) RD-TD planes of HSRed samples with rolling reductions of (a, e) 20%, (b, f) 40%, (c, g) 60%, and (d, h) 80%.

Fig. 3. Inverse pole figure maps and grain size distributions of HSRed samples with rolling reductions of (a) 20%, (b) 40%, (c) 60%, and (d) 80%.

Fig. 4. (a) Grain orientation spread and (b) inverse pole figure maps showing twinning-induced DRXed grains of 20% HSRed sample. (c) (0002) Pole figure showing crystallographic orientations of twinning-induced DRXed grains (1-5) in (a). The numerals in (b) indicate the misorientation angle at the grain boundaries.

Fig. 5. Misorientation angle map showing high-angle grain boundaries and various twin boundaries of HSRed samples with rolling reductions of (a) 20%, (b) 40%, (c) 60%, and (d) 80%.

Fig. 6. Inverse pole figure maps of (a-d) DRXed and (e-h) unDRXed regions of HSRed samples with rolling reductions of (a, e) 20%, (b, f) 40%, (c, g) 60%, and (d, h) 80%. fDRX and funDRX denote the area fractions of DRXed and unDRXed regions, respectively.

Fig. 7. Variations in area fraction of DRXed grains and average grain sizes of total, unDRXed, and DRXed regions with rolling reduction.

Fig. 8. Kernel average misorientation (KAM) maps and KAM distributions of HSRed samples with rolling reductions of (a) 20%, (b) 40%, (c) 60%, and (d) 80%.

Fig. 9. (0002) Pole figures of total, unDRXed, and DRXed regions of initial material and HSRed samples.

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Dynamic recrystallization behavior and microstructural evolution of Mg alloy AZ31 through high-speed rolling

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