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Research Papers

Deformation Behavior and Failure Analysis of Wrought Magnesium During Twin Rolling Casting and Hot Compression

[+] Author and Article Information
Shouren Wang1

 School of Mechanical Engineering, University of Jinan, Ji’nan 250022, Chinasherman0158@tom.com

Suk Bong Kang, JaeHyung Cho

 Korea Institute of Materials Science, 66 Sangnam-dong, Changwon 641010, Korea

Peiquan Guo, Liying Yang

 School of Mechanical Engineering, University of Jinan, Ji’nan 250022, China

1

Corresponding author.

J. Eng. Mater. Technol 134(4), 041002 (Aug 09, 2012) (5 pages) doi:10.1115/1.4004489 History: Received February 04, 2010; Revised June 15, 2011; Published August 09, 2012; Online August 09, 2012

The flow stress of AZ41M (Mg-Al-Zn-Mn-Ca) and ZK 60 (Mg-Zn-Zr) wrought magnesium alloys under the deformation conditions of twin rolling casting and hot compression at different temperature and strain rates was studied. Deformation behavior and failure mechanism of them were discussed. Microstructure evolutions were analyzed by optical microstructure and electron backscatter diffraction technique. The results have indicated that AZ41M and ZK 60 have different strain-stress curve under the same conditions. Working hardening results in occurrence of cracks in or around the shear bands. The recrystallized, equiaxed, and fined grains in shear bands attribute to recovery and recrystallization, grains refinement causes local working hardening as well as decreases of crack tip driving forces. Stress concentrated in shear bands causes crack initiation and propagation. Nucleus of cracks due to casting defects is another failure mode. With the increase of strain, dislocation rearranged in subgrain level while the low angle grain boundaries continuously evolved into high angle grain boundaries.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 4

Cracks occur in casting defects: (a) ZK60 and (b) AZ41M

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Figure 5

Microstructure of wrought magnesium under TRC: (a) ZK60 and (b) AZ41M

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Figure 6

Orientation maps of wrought magnesium under deformation conditions of 350 °C/0.1 s−1 and annealing conditions of 350 °C/1000 s: (a) ZK60 and (b) AZ41M

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Figure 3

Cracks occur in shear bands: (a) ZK60 and (b) AZ41M

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Figure 2

Crack failure phenomena of the specimen under 350 °C/1 s−1 : (a) ZK60 and (b) AZ41M

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Figure 1

True strain–true stress curves of at different deformation temperature and strain rate: (a) AZ41M and (b) ZK 60

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