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Acta Metall Sin  2017, Vol. 53 Issue (1): 107-113    DOI: 10.11900/0412.1961.2016.00134
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Study on the Microstructural Evolution and Mechanical Properties Control of a Strong Textured AZ31 Magnesium Alloy Sheet During Cryorolling
Yaqiong YAN,Jinru LUO(),Jishan ZHANG,Linzhong ZHUANG
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
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A strongly basal textured AZ31 magnesium alloy sheet with the normal direction (ND) perpendicular to the c-axis has been cryorolled at the liquid-nitrogen temperature to the strain of different amount to analyze the influence of cryogenic rolling temperature. The microstructure and texture of the cryorolled samples have been investigated by using SEM, EBSD and XRD. And the mechanical properties of the cryorolled sheets have also been tested under quasi-static uni-axial tension at the ambient temperature along the rolling direction (RD) and transverse direction (TD) respectively. The microstructural and textual evolutions of the strongly basal textured AZ31 magnesium alloy sheets during cryorolling and the relationship between mechanical properties and the microstructural and textural evolutions of cryorolled samples has also been discussed in this work. The results show that a lot of twins have been observed in cryorolled sheets, and they were found to be {101?2} tension twins. {101?2} tension twins were the dominant twinning type of the AZ31 magnesium alloy sheet during cryogenic rolling. With the increase of cryogenic rolling pass, new texture component with the c-axis paralleled to the normal direction (ND) was strengthened and the breadth of {101?2} tension twins was also increased. Grains were separated by the twin grain boundaries after cryorolling. The mechanical test results show that the strength of the sheets increased while the ductility decreased after cryogenic rolling. The strength of the sheets along RD was higher than that along TD.

Key words:  AZ31 magnesium alloy      cryogenic rolling      texture      twining      microstructure     
Received:  12 April 2016     
Fund: Supported by National Natural Science Foundation of China (No.51401019), China Postdoctoral Science Foundation (No.2014M550612), Fundamental Research Funds for the Central Universities (Nos.FRF-TP-14-048A1 and FRF-TP-15-055A2) and Common Construction Project from Beijing Municipal Commission of Education (No.FRF-SD-13-005B)

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Yaqiong YAN,Jinru LUO,Jishan ZHANG,Linzhong ZHUANG. Study on the Microstructural Evolution and Mechanical Properties Control of a Strong Textured AZ31 Magnesium Alloy Sheet During Cryorolling. Acta Metall Sin, 2017, 53(1): 107-113.

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Fig.1  Microstructure (a) and pole figures (b) of the initial AZ31 magnesium alloy sheet (RD—rolling direction, TD—transverse direction)
Fig.2  Texture of cryorolled samples(a) CR-P1 sample (cryorolled after one pass)(b) CR-P2 sample (cryorolled after two passes)
Fig.3  Macrostructures of CR-P1 (a) and CR-P2 (b) samples (ND—normal direction)
Fig.4  Microstructures of cryorolled samples(a) CR-P1 sample (b) CR-P2 sample
Fig.5  EBSD images of initial and cryorolled samples (TGB—twin grain boundary, HAGB—high angle grain boundary, LAGB—low angle grain boundary) (a) initial sample (b) CR-P1 sample (c) CR-P2 sample
Fig.6  Distributions of misorientation angle in initial and cryorolled samples
Fig.7  Dimensions of the dog-bone-shaped specimen (unit: mm)
Fig.8  True stress-true strain curves of the initial and cryorolled samples along RD and TD
Fig.9  Strain hardening rate curves of the initial and cryorolled samples along RD (a) and TD (b)
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