Hot deformation behavior and workability characteristic of a fine-grained Mg-8Sn-2Zn-2Al alloy with processing map

doi:10.1016/j.jmst.2018.12.001

材料科学与技术 ›› 2019, Vol. 35 ›› Issue (6): 1198-1209.DOI: 10.1016/j.jmst.2018.12.001

• • 上一篇

收稿日期:2018-03-30 修回日期:2018-05-07 接受日期:2018-05-22 出版日期:2019-06-20 发布日期:2019-06-19

Hot deformation behavior and workability characteristic of a fine-grained Mg-8Sn-2Zn-2Al alloy with processing map

Weili Cheng^a^b^c^*(), Yang Bai^c, Shichao Ma^c, Lifei Wang^a^c, Hongxia Wang^a^c, Hui Yu^d

^aShanxi key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan 030024, China
^bKey Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
^cSchool of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
^dSchool of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, China

Received:2018-03-30 Revised:2018-05-07 Accepted:2018-05-22 Online:2019-06-20 Published:2019-06-19
Contact: Cheng Weili
About author:
¹ These authors contributed equally to this work.

摘要/Abstract

Abstract:

The hot deformation behavior of a fine-grained Mg-8Sn-2Zn-2Al (TZA822, in wt%) alloy was investigated in the temperature range of 150-350 °C and the strain rate of 0.01-10 s^-1 employing thermomechanical simulator. In most of the cases, the material showed typical dynamic recrystallization (DRX) features i.e., a signal peak value followed by a gradual decrease or to reach a steady state. The work hardening rate was found to increase with decreasing temperature and increasing strain rate, while strain rates had great effects on work hardening behavior. Meanwhile, the constitutive analysis indicated that cross-slip of dislocations was likely to be the dominant deformation mechanism. In addition, the processing map at the strain of 0.1-0.7 showed two stability domains with high power dissipation efficiencies and the optimum hot working parameters for the studied alloy was determined to be 350 °C/0.01 s^-1 and 350 °C/10 s^-1, at which continuous DRX (CDRX) and discontinuous DRX (DDRX) as main softening mechanism. The instability regions occurred at 200-250 °C/10 s^-1 and the main flow instability mechanism was twinning and/or flow localization bands, which were prone to induce cracks and caused in-consistent mechanical properties of the alloy.

Key words: Mg-Sn based alloy, Hot deformation, Processing map, Dynamic recrystallization

. [J]. 材料科学与技术, 2019, 35(6): 1198-1209.

Weili Cheng, Yang Bai, Shichao Ma, Lifei Wang, Hongxia Wang, Hui Yu. Hot deformation behavior and workability characteristic of a fine-grained Mg-8Sn-2Zn-2Al alloy with processing map[J]. J. Mater. Sci. Technol., 2019, 35(6): 1198-1209.

图/表 14

Fig. 1. Microstructure of fine-grained TZA822 alloy: (a) OM, (b) SEM, (c) the EDS results of the second phases in (b) and (d) grain size distribution.

Fig. 2. True stress-true strain curves of fine-grained TZA822 alloy at different temperatures with strain rate: (a) $\dot{ε}$ =0.01 s-1; (b) $\dot{ε}$ =0. 1 s-1; (c) $\dot{ε}$ =1 s-1; (d) $\dot{ε}$ =10 s-1.

Fig. 3. Variation of peak stress for fine-grained TZA822 alloy upon different strain rate (a) and deformation temperature (b).

Fig. 4. Relationship between: (a)ln$\dot{ε}$-lnσ,(b)ln$\dot{ε}$-lnσ-σ, (c) ln$\dot{ε}$-ln[sinh(ασ)] and (d)ln[sinh(ασ)] -1/T.

Fig. 5. (a) Linear relationship betweenlnZ-ln[sinh(ασ)], (b) the comparison of the calculated and measured peak stress.

Fig. 6. Processing map of the fine-grained TZA822 alloy at the strain of 0.1 (a), 0.3 (b), 0.5 (c) and 0.7 (d).

Fig. 7. Variation of the work hardening rate (θ) with different temperatures (a) and strain rate (b).

Fig. 8. The Schematic diagram defining and exhibiting how to calculate σs and θ0.

Table 1 Comparison of average Q value of the fine-grained TZA822 alloy and coarse-grained Mg alloys.

Alloy	Deformation conditions		Structure	Q (kJ/mol)	Ref.
Alloy	Temp. (°C)	Stain rate (s^-1)	Structure	Q (kJ/mol)	Ref.
TZA822	150-350	0.01-10	Fine-grained	189.5	This study
Mg-3Sn-1Ca	350-550	0.1-10	Coarse-grained	164	[10]
AZ61	250-450	0.001-1	Coarse-grained	132	[28]
SiCp/AZ91	270-420	0.001-1	Coarse-grained	140	[5]
Mg-3Zn-0.8Zr	250-400	0.001-1	Coarse-grained	124.6	[26]

Fig. 9. Microstructures of fine-grained TZA822 alloy deformed at (a) 300 °C/0.01 s-1, (b) 350 °C/0.01 s-1 and (c) 350 °C/10 s-1.

Fig. 10. The EBSD analysis of TZA822 alloy deformed at 350 °C/0.01 s-1 and 350 °C/10 s-1: (a) and (b) grain boundary maps; (c) and (d) misorientation profiles along the line marked in (a) and (b); (d) and (e) (0001) pole figures.

Fig. 11. The TEM micrographs of TZA822 alloy deformed at 350 °C/0.01 s-1 exhibiting: (a) dislocation network, (b) dislocations arrays, and (c) subgrains and (d) DRX grain; (e) DDRX and (f) CDRX deformed at 350 °C/10 s-1.

Fig. 12. Schematic summaries the two different DRX mechanisms.

Fig. 13. Microstructures of TZA822 alloy deformed at: (a) 200 °C/10 s-1, (b) 250 °C/10 s-1.

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Hot deformation behavior and workability characteristic of a fine-grained Mg-8Sn-2Zn-2Al alloy with processing map

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