Effect of Zener-Hollomon Parameter on High-Temperature Deformation Behaviors of Mg-6Zn-1.5Y-0.5Ce-0.4Zr Alloy

doi:10.1007/s40195-020-01163-4

Abstract

Abstract:

High-temperature compressive deformation behaviors of Mg-6Zn-1.5Y-0.5Ce-0.4Zr alloy were investigated at temperatures and strain rates ranging from 523 to 673 K and from 0.001 to 1 s^-1, respectively. The studied alloy was mainly composed of α-Mg, Mg₃Zn₆Y (I phase), Mg-Zn-Ce and Mg₃Zn₃Y₂ (W phase). The constitutive equation of Mg alloy was obtained, and the apparent activation energy (Q) was determined as 200.44 kJ/mol, indicating that rare earth phase increases the difficulty of deformation. The work hardening involves three stages: (1) linear hardening stage; (2) strain hardening stage; and (3) softening and steady-state stage. During these three stages, the dislocation aggregation and tangling, dynamic recovery and recrystallization occur sequentially. To characterize the dynamic recrystallization (DRX) volume fraction, the DRX kinetics was investigated using the Avrami-type equation. The deformation mechanism of magnesium alloy under different Zener-Hollomon parameter (Z) value conditions was also studied. At high Z values and intermediate conditions, dislocations rapidly generate and pile up in the alloy. Recrystallization is hardly seen at this time. At low Z condition, the DRX occurs in the alloy.

Key words: Mg-6Zn-1.5Y-0.5Ce-0.4Zr alloys, Work hardening, Dynamic recrystallization, Zener-Hollomon (Z) parameter

Bo Wu, Jianbo Li, Lizi Liu, Xianhua Chen, Jun Tan, Jiangfeng Song, Muhammad Rashad, Fusheng Pan. Effect of Zener-Hollomon Parameter on High-Temperature Deformation Behaviors of Mg-6Zn-1.5Y-0.5Ce-0.4Zr Alloy[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(5): 606-616.

Figures/Tables 14

Table 1 Chemical composition of Mg-6Zn-1.5Y-0.5Ce-0.4Zr alloy (wt%)

Zn	Y	Ce	Zr	Mg
6	1.5	0.5	0.4	Bal.

Fig. 1 SEM micrographs and XRD pattern of Mg-Zn-Zr-RE(Y-Ce) alloy: a SEM image; b XRD pattern; c, d morphologies of Mg-Zn-Ce, Mg3Zn3Y2, Mg3Zn6Y and Zn, Zr-rich phase

Table 2 EDS results of Mg-Zn-Zr-RE(Y-Ce) alloy in Fig. 1

Point	Composition (at%)
Point	Mg	Zn	Y	Ce	Zr
1	62.4	16.0			21.5
2	54.1	37.7		7.2
3	62.8	23.9	11.8
4	49.3	33.2	15.7
5	30.4	45.6	21.3
6	73.3	10.8			15.9
7	37.2	27.0			35.7
8	50.1	20.7			29.1
9	58.9	33.3		6.9
10	31.2	55.5	8.7

Fig. 2 True stress-strain flow curves of Mg-Zn-Zr-RE(Y-Ce) alloy obtained at different temperatures: a 523 K, b 573 K, c 623 K, d 673 K

Fig. 3 Relationships of Mg-Zn-Zr-RE(Y-Ce) for: a $\ln \dot{\varepsilon } - \ln \left[ {\sinh \left( {\alpha \sigma } \right)} \right]$, b $\ln \left[ {\sinh \left( {\alpha \sigma } \right)} \right] - 1/T$

Fig. 4 Hot deformation activation energy (Q) under different true strains ranging from 0.1 to 0.6

Fig. 5 Zener-Hollomon parameter of Mg-Zn-Zr-RE(Y-Ce) as a function of temperature and strain rate. The values on the contour lines are lnZ

Fig. 6 Backscatter electron (BSE) micrographs of Mg-Zn-Zr-RE(Y-Ce) specimens deformed at different Z values: a lnZ = 42.85 (high Z, 523 K/1 s-1), b lnZ = 34.51 (intermediate Z, 573 K/0.01 s-1), c lnZ = 26.39 (low Z, 673 K/0.001 s-1)

Fig. 7 EBSD inverse pole figure (IPF) and image quality (IQ) maps of Mg-Zn-Zr-RE(Y-Ce) specimens deformed to a true strain of 0.65at different Z values. a, d lnZ = 42.5 (high Z, 523 K/1 s-1); b, e lnZ = 34.51 (intermediate Z, 573 K/0.01 s-1); c, f lnZ = 26.39 (low Z, 673 K/0.001 s-1), g fraction of grain boundaries with different misorientation angles

Fig. 8 EBSD maps and the distribution of grain boundary of alloys with different strains under 673 K/0.001 s-1 deformation conditions: a, d lnZ = 50.39 (ε = 0.05), b, e lnZ = 40.87 (ε = 0.1) and c, f lnZ = 31.91 (ε = 0.35), g fraction of grain boundaries with different misorientation angles

Fig. 9 Bright-field images of different Z parameters: a lnZ = 42.5 (high Z, 523 K/1 s-1), b lnZ = 34.51 (intermediate Z, 573 K/0.01 s-1), c, d lnZ = 26.39 (low Z, 673 K/0.001 s-1)

Fig. 10 Work hardening rate vs. true strain curve (a) and three stages in the hot deformation process; (b) true strain of 0.65at 573 K/0.01 s-1

Table 3 Values of εc of Mg-Zn-Zr-RE(Y-Ce) under different deformation conditions

K	1 s^-1	0.1 s^-1	0.01 s^-1	0.001 s^-1
523	0.3679	0.2778	0.2681	0.2567
573	0.2938	0.2812	0.2578	0.2018
623	0.3290	0.2659	0.2528	0.0699
673	0.3250	0.1430	0.1349	0.1097

Fig. 11 DRX volume fraction of Mg-Zn-Zr-RE(Y-Ce) magnesium alloyat different Z values

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