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Chinese Journal of Materials Research  2019, Vol. 33 Issue (6): 452-460    DOI: 10.11901/1005.3093.2018.506
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Influence of Microstructure Evolution on Superplastic Properties of Fine-grained Mg-Y-Nd Alloy
Genghua CAO,Zhenxing ZHENG(),Yixiong LIU,Min WANG,Weihua LI
School of Mechanical and Electronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510635, China
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Genghua CAO,Zhenxing ZHENG,Yixiong LIU,Min WANG,Weihua LI. Influence of Microstructure Evolution on Superplastic Properties of Fine-grained Mg-Y-Nd Alloy. Chinese Journal of Materials Research, 2019, 33(6): 452-460.

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Abstract  

Superplastic performance of the submerged friction stir processed Mg-Y-Nd alloy was assessed by initial strain rates in range of 2×10-2 to 4×10-4 s-1 at temperatures in range of 683 to 758 K, aiming to reveal the correlation of the microstructure evolution and the superplastic performance of the alloy. Results show that due to the fine-grained and stable microstructure, the alloy exhibits the maximum elongation of 967% by strain rate of 3×10-3 s-1 at 733 K, and the excellent high strain rate superplasticity of 900% by 2×10-2 s-1 at 758 K respectively. The average size of α-Mg grains and secondary phase particles remarkably increased when the alloy subjected to high temperature tensile tests for long time, as a result, the elongation of the alloy significantly decreased. Cavities easily formed at grain boundaries instead of the interface of secondary particles and matrix, which may be responsible to the good deformation compatibility between particles and matrix.
Key words:  metallic materials      Mg-Y-Nd alloy      friction stir processing      superplastic deformation      microstructure     
Received:  16 August 2018     
ZTFLH:  TG146.22  
Fund: Natural Science Foundation of Guangdong Province(No. 2017A030310630);Science and Technology Plan Projects of Guangdong Province(No.2017A070715012);Innovation Strong School Project of Guangdong Province(Nos. 2017KTSCX115);Innovation Strong School Project of Guangdong Province(Nos. 2015KTSCX084)
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Genghua CAO
Zhenxing ZHENG
Yixiong LIU
Min WANG
Weihua LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.506     OR     https://www.cjmr.org/EN/Y2019/V33/I6/452

Fig.1  Grip region, gauge region and fracture tip in fractured specimen
Fig.2  SEM image of cast specimen (a) and TEM image of SFSP specimen (b)
Fig.3  Appearance of SFSP specimens after tensile tests at different strain rates: (a) 2×10-2 s-1, (b) 3×10-3 s-1, (c) 4×10-4 s-1
Fig.4  OM images of grip region in fractured specimens at different test conditions (a, b, c) 683 K; (d, e, f) 708 K; (g, h, i) 733 K; (j, k, l) 758 K; (a, d, g, j) 2×10-2 s-1; (b, e, h, k) 3×10-3 s-1; (c, f, i, l) 4×10-4 s-1
Fig.5  SEM images of gauge region in SFSP specimens at different test conditions (a, b, c) 683 K; (d, e, f) 708 K; (g, h, i) 733 K; (j, k, l) 758 K; (a, d, g, j) 2×10-2 s-1; (b, e, h, k) 3×10-3 s-1; (c, f, i, l) 4×10-4 s-1
Fig.6  BSE images of gauge region in SFSP specimen at different test conditions (a, b, c) 683 K; (d, e, f) 708 K; (g, h, i) 733 K; (j, k, l) 758 K; (a, d, g, j) 2×10-2 s-1; (b, e, h, k) 3×10-3 s-1; (c, f, I, l) 4×10-4 s-1
Fig.7  Elongation of the SFSP specimens (a), average grain sizes in grip region (b), average grain sizes (c) and average particle sizes in gauge region (d) of fractured specimens at different test conditions
Fig.8  SEM images showing surface morphologies deformed at different test conditions (a, b, c) 683 K; (d, e, f) 708 K; (g, h, i) 733 K; (j, k, l) 758 K; (a, d, g, j) 2×10-2 s-1; (b, e, h, k) 3×10-3 s-1; (c, f, i, l) 4×10-4 s-1
Fig.9  Surface morphologies near the fracture tip deformed at 733 K and 4×10-4 s-1: (a) secondary electron micrograph; (b) back-scattered electron micrograph
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