Microstructure and Mechanical Properties of AZ81 Magnesium Alloy after Unequal Channel Angular Pressing

Abstract:

The microstructure and mechanical properties of AZ81magnesium alloys after unequal channel angular pressing (UCAP) was investigated using self-made 90° die under different temperature. The results showed that under the same pressing speed, there was a better grain refinement and mechanical property improvement with the decreasing of pressing temperature, however, the tiny cracks on the surface of the processed samples increased. When squeezed at 250 , the average grain was refined from the initial 150um to10um. The tensile strength was changed to 350Mpa, and the elongation was of 10. Tensile fractures presented the increment of dimples structure, which was the result of refined α-Mg matrix and intermetallic compound β-Mg₁₇Al₁₂ phase by severe shear and plastic deformation at high temperature press.

• Periodical: Materials Science Forum (Volume 749)
• Pages: 343-348
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.749.343
• Online since: March 2013
• Authors: Xiao Ping Luo, Ming Gang Zhang, Jun Qi Zhou
• Keywords: AZ81 Magnesium Aiioy, Unequal Channei Angular Pressing

References

[1] Ding Wenjiang, Science and Technology of Magnesium Alloy, Beijing: Science Press, (2007).

[2] S. R. Agnew, J. A. Horton, T. M. Lillo, et al. Enhanced ductility in strongly textured magnesium produced by equal channel angular processing. Scripta Materialia , 2004, 50(3): 377-381.

DOI: 10.1016/j.scriptamat.2003.10.006

[3] Lu Guoxiang, Research and Development Prospects of Equal Channel Angular Pressing (ECAP) of Magnesium Alloys Materials Review , 2008, 22(4): 84-87.

[4] Minoru Furukawa, Yoshinori Iwahashi, Zenji Horita, et al. Materials Science and Engineering A, 1998, 257(2): 328-332.

[5] Dong Hynk Shin, Jong-Jin Pak, Young Kuk Kim, et al. Effect of pressing temperature on microstructure and tensile behavior of low carbon steels processed by equal channel angular pressing. Materials Science and Engineering A, 2002, 325 (1) : 31-37.

DOI: 10.1016/s0921-5093(01)01415-0

[6] Furukawa M, Horita Z, Nemoto M, et al. Review processing of metals by equal-channel angular pressing . Journal of Materials Science, 2001, 36: 2835-2843.

[7] Chen Kehua, Microstructure and Properties of Al-Mg2Si Alloys after Equal Channel Angular Pressing. Rare Metal Materials and Engineering , 2010, 39(2): 352-355.

[8] C.W. Su, B.W. Chua, L. Lu, et al. Properties of severe plastically deformed Mg alloys . Materials Science and Engineering: A, 2005, 402(1): 163-169.

DOI: 10.1016/j.msea.2005.04.035

[9] Minoru Furukawa, Yoshinori Iwahashi, Zenji Horita, et al. The shearing characteristics associated with equal-channel angular pressing [J]. Materials Science and Engineering A, 1998, 257(2): 328-332.

DOI: 10.1016/s0921-5093(98)00750-3

[10] V.N. Chuvil'deev , T.G. Nieh , M. Yu. Gryaznov , A.N. Sysoev , V.I. Kopylov. Low-temperature superplasticity and internal friction in microcrystalline Mg alloys processed by ECAP. Scripta Materialia 2004 (50): 861–865.

DOI: 10.1016/j.scriptamat.2003.12.003

[11] Liu Tianmo，Liu Jianzhong，Microstructure and deformation behavior of dual-directional extruded AZ31 magnesium alloy . The Chinese Journal of Nonferrous Metals[J], 2010(09): 1657-1664.

[12] Ding Yeli, Effect of ECAE on Grain Refinement of AZ80A Alloy. Hot Working Technology [J], 2011, 40(3): 89-91.

[13] Chen Lijia. Plastic deformation behavior of AZ61 magnesium alloy processed by equal channel angular pressing. Journal of Shenyang University of Technology [J], 2007, 29(1): 21-24.