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Microstructure Characterization of ZK60 Magnesium Alloys Using TEM and HR-EBSD

Published online by Cambridge University Press:  06 August 2013

Jae-Hyung Cho ,
Soo-Hyun Kim ,
Sang-Ho Han  and
Suk-Bong Kang
Jae-Hyung Cho*
Affiliation:
Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon, Gyeongnam 641-831, Republic of Korea
Soo-Hyun Kim
Affiliation:
Busan Techno Park, 1274 Jisa-dong, Gangseo-gu, Busan 618-230, Republic of Korea
Sang-Ho Han
Affiliation:
Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon, Gyeongnam 641-831, Republic of Korea
Suk-Bong Kang
Affiliation:
Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu, Changwon, Gyeongnam 641-831, Republic of Korea
*
*Corresponding author. E-mail: jhcho@kims.re.kr
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Abstract

ZK60 (Mg–Zn–Zr) alloys exhibited a variation in precipitates with aging, and their mechanical properties also changed. Microindentation tests were carried out on two types of ZK60 alloys of solid solution (T4) and peak aging (T6). Microstructure and texture evolution during indentation was investigated using electron backscatter diffraction. Twinning occurred near the indentation marks in most grains. It was found that tensile twinning was dominant, and two twin variants were usually observed. Texture and microstructure evolution by twinning and slip activation was further examined by uniaxial compression test with strain. The initial random orientation gradually changed into basal fibers with strain. Some grains with nonbasal orientations aligned with the loading direction easily underwent twinning followed by slip deformation. Other grains near basal orientations revealed only slip deformation.

Keywords

magnesium alloysZK60indentationcompressionmicrostructureEBSDTEMtwin variants
Type
Research Article
Information
Microscopy and Microanalysis , Volume 19 , Supplement S5: IUMAS , August 2013 , pp. 8 - 12
Copyright
Copyright © Microscopy Society of America 2013 

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References

Agnew, S.R. & Duygulu, O. (2005). Plastic anisotropy and the role of non-basal slip in magnesium alloy AZ31B. Int J Plast 21, 1161–1193.10.1016/j.ijplas.2004.05.018Google Scholar
Agnew, S.R., Yoo, M.H. & Tome, C.N. (2001). Application of texture simulation to understanding mechanical behavior of Mg and solid solution alloys containing Li and Y. Acta Mater 49, 4277–4289.10.1016/S1359-6454(01)00297-XGoogle Scholar
Chen, H., Kang, S.B., Yua, H., Cho, J.H., Kim, H.W. & Mina, G. (2009). Effect of heat treatment on microstructure and mechanical properties of twin roll cast and sequential warm rolled ZK60 alloy sheets. J Alloys Compd 476, 324–328.10.1016/j.jallcom.2008.08.077Google Scholar
Cho, J.H., Jin, Y.M., Kim, H.W. & Kang, S.B. (2007). Microstructure and mechanical properties of ZK60 alloy sheets during aging. Mater Sci Forum 558–559, 159–164.10.4028/www.scientific.net/MSF.558-559.159Google Scholar
Cho, J.H., Rollett, A.D. & Oh, K.H. (2005). Determination of a mean orientation in electron backscatter diffraction measurements. Metall Mater Trans A 36(12), 3427–3438.Google Scholar
Choi, S.H., Shin, E.J. & Seong, B.S. (2007). Simulation of deformation twins and deformation texture in an AZ31 Mg alloy under uniaxial compression. Acta Mater 55, 4181–4192.10.1016/j.actamat.2007.03.015Google Scholar
Gao, X. & Nie, J.F. (2007). Characterization of strengthening precipitate phases in a Mg-Zn alloy. Scr Mater 56(8), 645–648.10.1016/j.scriptamat.2007.01.006Google Scholar
He, S.M., Peng, L.M., Zeng, X.Q., Ding, W.J. & Zhu, Y.P. (2006). Comparison of the microstructure and mechanical properties of a ZK60 alloy with and without 1.3 wt.% gadolinium addition. Mater Sci Eng A 433, 175–181.10.1016/j.msea.2006.06.063Google Scholar
Lorimer, G. & Mackenzie, L. (2005). An EBSD study of deformation and recrystallization in magnesium alloys. Microsc Microanal 11(Suppl 2), 192–193.10.1017/S1431927605505828Google Scholar
Maeng, D.Y., Kim, T.S., Lee, J.H., Hong, S.J., Seo, S.K. & Chun, B.S. (2000). Microstructure and strength of rapidly solidified and extrusion Mg-Zn alloys. Scr Mater 43, 385–389.10.1016/S1359-6462(00)00428-0Google Scholar
Nave, M.D. & Barnett, M.R. (2004). Microstructures and textures of pure magnesium deformed in plane-strain compression. Scr Mater 51, 881–885.10.1016/j.scriptamat.2004.07.002Google Scholar
Wei, L.Y., Dunlop, G.L. & Westengen, H. (1995a). The intergranular microstructure of cast Mg-Zn and Mg-Zn-rare earth alloys. Metall Trans A 26, 1947–1955.Google Scholar
Wei, L.Y., Dunlop, G.L. & Westengen, H. (1995b). Precipitation hardening of Mg-Zn and Mg-Zn-RE alloys. Metall Trans A 26, 1705–1716.10.1007/BF02670757Google Scholar
Xu, D.K., Liu, L., Xu, Y.B. & Han, E.H. (2006). The effect of precipitates on the mechanical properties of ZK60-Y alloy. Mater Sci Eng A 420, 322–332.10.1016/j.msea.2006.01.092Google Scholar