Effect of Large Strain on Texture Formation Behavior of AZ80 Magnesium Alloy during High Temperature Deformation

Abstract:

In previous study, the formation behavior of texture and microstructure in AZ80 magnesium alloy under high temperature deformation was investigated. It was found that the basal texture was formed at stress of more than 15-20MPa and the non-basal texture was formed at stress of less than 15-20MPa. This means that stress of 15-20MPa is the change point of deformation mechanism. Therefore, in this study, uniaxial compression deformation of AZ80 magnesium alloy was carried out at high temperature deformation (stress of 15-20MPa). Behaviors of microstructure and texture development are experimentally studied. The material used in this study is a commercial magnesium alloy extruded AZ80. The uniaxial compression deformation is performed at temperature of 723K and strain rate 3.0×10^-3s^-1, with a strain range of between-0.4 and-1.3. Texture measurement was carried out on the compression planes by the Schulz reflection method using nickel filtered Cu Kα radiation. EBSD measurement was also conducted in order to observe spatial distribution of orientation. As a result of high temperature deformation, the maximum value of the flow stress is observed at the true stress-strain curves, and the main component of texture and the accumulation of pole density vary depending on deformation condition.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 938-942
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.938
• Online since: November 2016
• Authors: Kwon Hoo Kim, Kazuto Okayasu, Hiroshi Fukutomi*
• Keywords: Grain Growth, High Temperature Deformation, Magnesium Alloy, Texture, Uniaxial Compression

References

[1] B. L. Mordike and T. Ebert, Magnesium: Properties - applications - potential, Mater. Sci. Eng. A 302 (2001) 37-45.

[2] G. V. Raynor, the Physical Metallurgy of magnesium and Its Alloys, Pergamon, London, (1959).

[3] S. R. Agnew and O. Duygulu, A Mechanistic Understanding of the Formability of Magnesium: Examining the Role of Temperature on the Deformation Mechanisms, Mater. Sci. Forum 419-422 (2003) 177-188.

DOI: 10.4028/www.scientific.net/msf.419-422.177

[4] R. E. Reed-Hill, A study of the {1011} and {1013} twinning modes in magnesium, Trans. Metall. Soc. AIME 218 (1960) 554-558.

[5] J. Kim, K. Okayasu and H. Fukutomi, Deformation Behavior and Texture Formation in AZ80 Magnesium Alloy during Uniaxial Compression Deformation at High Temperatures, Mater. Trans. 54 (2013) 192-198.

DOI: 10.2320/matertrans.h-m2012832

[6] J. Kim, K. Okayasu and H. Fukutomi, Texture Evolution in AZ80 Magnesium Alloy by the Plane Strain Compression Deformation at High Temperature, Mater. Trans. 53 (2012) 1870-1875.

DOI: 10.2320/matertrans.l-m2012828

[7] M. Dahms and H. J. Bunge, The Iterative Series-Expansion Method for Quantitative Texture Analysis. I. General Outline, J. Appl. Cryst. 22 (1989) 439-447.

DOI: 10.1107/s0021889889005261

[8] J. Kim, K. Okayasu and H. Fukutomi, Formation of Texture in AZ80 during High Temperature Compression Deformation, Mater. Sci. Forum 715-716 (2012) 936-939.

DOI: 10.4028/www.scientific.net/msf.715-716.936

[9] L. Helis, K. Okayasu and H. Fukutomi, Microstructure evolution and texture development during high-temperature uniaxial compression of magnesium alloy AZ31, Materials Science and Engineering A 430 (2006) 98-103.

DOI: 10.1016/j.msea.2006.04.125