Dynamic Recrystallization Behavior of Bimodal Size SiCp-Reinforced Mg Matrix Composite during Hot Deformation

doi:10.1007/s40195-016-0415-0

Abstract

Abstract:

The (submicron + micron) bimodal size SiCp-reinforced Mg matrix composite was compressed at the temperature of 270-420 °C and strain rate of 0.001-1 s^-1. Then, dynamic recrystallization (DRX) behavior of the composite was investigated by thermodynamic method and verified by microstructure analysis. Results illustrated that the composite possess the lower critical strain and higher DRX ratio as compared to monolithic Mg alloys during hot deformation process. The predicted DRX ratio increased with the proceeding of compression, which was well consistent with the experimental value. Results from thermodynamic calculation suggested that the occurrence of DRX could be promoted by SiCp, which would be further proved by microstructure analysis. Formation of particle deformation zone around micron SiCp played a significant role in promoting DRX nucleation. Nevertheless, the distribution of submicron SiCp was increasingly uniform with the proceeding of compression, which could fully restrain grain growth. Therefore, the corporate effects of micron and submicron SiCp on DRX contributed to the improvement of DRXed ratio and the refinement of grain size for the composite during compression process.

Key words: Magnesium matrix composite, Deformation, Dynamic recrystallization, Microstructure, Thermodynamic analysis

Cui-Ju Wang, Kun-Kun Deng, Shan-Shan Zhou, Wei Liang. Dynamic Recrystallization Behavior of Bimodal Size SiCp-Reinforced Mg Matrix Composite during Hot Deformation[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(6): 527-537.

Figures/Tables 12

Fig. 1 True stress-strain curves of S-1.5 + 10-8.5 composite under various compression conditions

Fig. 2 The θ-σ plots of the S-1.5 + 10-8.5 composite based on Fig. 1

Fig. 3 Relationship between dθ/dσ and σ of S-1.5 + 10-8.5 composite based on Fig. 2

Fig. 4 Relationship of strain rate ? versus critical stress σca, critical strain εcb, peak stress σpc, peak strain εpd

Fig. 5 The σc and εc of AZ91 alloy and S-1.5 + 10-8.5 composite compressed at 270-370 °C and 0.01 s-1: a critical stress σc, b critical strain εc

Table 1 Calculated n values at different temperatures and strain rates

Temperature (°C)	0.001 s^-1	0.01 s^-1	0.1 s^-1	1 s^-1
270	1.1719	0.1353	1.3746	0.7867
320	0.687	0.5122	0.6	0.687
370	0.58175	0.5023	0.4565	0.3945
420	0.6608	0.5939	0.4142	0.37

Fig. 6 Predicted DRX ratio (XDRX) of S-1.5 + 10-8.5 composite based on Eqs. (1-3) at different temperatures: a 270 °C, b 320 °C, c 320 °C, d 420 °C

Fig. 7 Comparison of the experimental and predicted value of XDRX between AZ91 alloy and S-1.5 + 10-8.5 composite at 320 °C and 0.01 s-1

Fig. 8 Optical microstructures of AZ91 alloy and S-1.5 + 10-8.5 composite compressed at 320 °C and 0.01 s-1 with different strains (0.1, 0.2, 0.3 and 0.5)

Fig. 9 XDRXa and average DRXed grain size b of AZ91 alloy and S-1.5 + 10-8.5 composite at 320 °C and 0.01 s-1 measured by the Image Pro-Plus software

Fig. 10 a SEM image of the microstructure of S-1.5 + 10-8.5 composite at the strain of 0.1 (compressed at 320 °C and 0.01 s-1) and the magnified images of the regions Ab and Bc in Fig. 10a

Fig. 11 SEM images of the microstructures of S-1.5 + 10-8.5 composite compressed at 320 °C and 0.01 s-1 to the strain of 0.2 a, 0.3 b and 0.5 c, d

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