Microstructure and Mechanical Property of Pure Magnesium Processed by Cyclic Extrusion Compression

doi:10.11901/1005.3093.2014.600

Chinese Journal of Materials Research

2015, Vol. 29

Issue (8): 569-575 DOI: 10.11901/1005.3093.2014.600

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Microstructure and Mechanical Property of Pure Magnesium Processed by Cyclic Extrusion Compression

Tingting DONG^1,²,Qudong WANG^1,^2,^**(

),Wei GUO^1,²,Jianfeng LIU^1,²,Haiyan JIANG^1,²

1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China
2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China

Cite this article:

Tingting DONG,Qudong WANG,Wei GUO,Jianfeng LIU,Haiyan JIANG. Microstructure and Mechanical Property of Pure Magnesium Processed by Cyclic Extrusion Compression. Chinese Journal of Materials Research, 2015, 29(8): 569-575.

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Abstract

Microstructure and tensile property of pure magnesium processed by cyclic extrusion-compression (CEC) at 350℃ for 2, 4 and 8 passes respectively, as well as for 2 passes at 250℃, 350℃ and 450℃ respectively are investigated. Results showed that the microstructure of pure magnesium is significantly refined and recrystallized after CEC for 2 passes at 350℃. With the increase of passes, the grain sizes of CECed pure magnesium showed no obvious differences. It was found by means of electron backscatter diffraction (EBSD) analysis that a texture with the basal plane of grains inclining 20o -40o to the extrusion direction developed during the CEC processing. With the increase of CEC passes, the maximum intensity of the texture and Schmid factor of basal slip system increased. Compare to that for 2 passes, the yield stress of pure magnesium after CEC for 8 passes at 350℃ decreases from 60 MPa to 41 MPa, and the elongation increases from 8% to 16.7%. The yield stress and grain size of the pure Mg processed by CEC for 2 passes at 250℃, 350℃and 450℃ follows the Hall-Petch relationship, which can be described as .

Key words: metallic materials pure magnesium cyclic extrusion compression microstructure mechanical property texture grain size

Received: 20 October 2014

Fund: *Supported by National Natural Science Foundation of China Nos. 51074106, 51374145 & 51404151, and China Postdoctoral Science Foundation No. 2014M561466.

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.600 OR https://www.cjmr.org/EN/Y2015/V29/I8/569

Fig.1 Schematic of CEC method; F_A and F_B are the applied stress

Fig.2 Schematic of sample position

Fig.3 Microstructure of as-cast pure magnesium

Fig.4 Microstructure of 350℃ CECed pure magnesium, (a) 2 passes, (b) 4 passes, (c) 8 passes

Fig.5 Microstructure of CECed 2 passes pure magnesium at 250℃ (a) and 450℃ (b)

Fig.6 (0001), 10 1 ? 0 and 10 1 ? 1 pole figures of pure Mg processed by CEC at 350℃ for 2 passes (a) 4 passes, (b) and 8 passes (c)

Fig.7 Misorientation map of pure magnesium after CEC processing for 2 passes (a) and 8 passes (b)

Fig.8 Tensile stress-strain curves of pure Mg processed by cyclic extrusion compression at 350℃

Fig.9 Tensile stress-strain curves of pure Mg processed by cyclic extrusion compression for 2 passes at three different temperatures

Fig.10 The relationship between yield stress and grain size of CECed pure Mg

Fig.11 The relationship between mechanical property and maximum intensity of texture on 350℃ CECed pure Mg

Fig.12 Schmid Factor of 350℃ CECed pure Mg

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