Influence of Extrusion Methods on Microstructure of Mg-Al-Zn Alloy

Abstract:

The correlation between the deformation behavior and the microstructure of AZ31 magnesium alloy processed by as-extruded and ECAP is investigated in this paper. The grain size of as-extruded AZ31 magnesium alloy is about 30μm which dues to basal and twinning. Twinning is the main deformation behavior for as-extruded AZ31 magnesium alloy. The deformation of as-extruded is mainly caused by basal slip and twinning. The grains of ECAP are further refined to 6μm. With little amount of twins, the refinement of AZ31 magnesium alloy is caused by non-basal sliding. For ECAP precessed sample, grain boundary sliding happens and the proportion of high-angle grains are improved, which makes grain boundary sliding easier. The main deformation mechanism of ECAP is non-basal slip and grains boundary sliding.

• Periodical: Key Engineering Materials (Volumes 575-576)
• Pages: 402-405
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.575-576.402
• Online since: September 2013
• Authors: Yun Cai, Guirong Li, Xue Ting Yuan, Hong Ming Wang, Yu Tao Zhao, Jun Jie Wang
• Keywords: As-Extruded, AZ31magnesium Alloy, ECAP, Grain Boundary Sliding, Refinement

References

[1] Avedesian M M, Baker H. ASM Specialty Handbook -Magnesium and Magnesium Alloys. USA: ASM International, 1999: 1-30.

[2] RZ Valiev, TG Langdon. Pinciples of equal channel angular pressing as processing tool for grain refinement. Progress in Materials Science. (2006).

DOI: 10.1016/j.pmatsci.2006.02.003

[3] LEE S M, LANGDON T G. High strain rate superplasticity in a Zn-22%Al alloy after equal-channel angular pressing. Mater Sci Forum, 2001, 357/359: 321-326.

DOI: 10.4028/www.scientific.net/msf.357-359.321

[4] YAMASHITA A, HORITA Z, LANGDON T G. Improving the mechanical properties of magnesium and a magnesium alloy through severe plastic deformation. Mater Sci Eng A, 2001, 300(1/2): 142-147.

DOI: 10.1016/s0921-5093(00)01660-9

[5] Zhu Y T, Lowe T C. Observations and issues on mechanisms of grain refinement during ECAP process. Materials Science and Engineering, 2000, A291(1): 46~53.

DOI: 10.1016/s0921-5093(00)00978-3

[6] Ziqian Liu, Xiaoming Feng, Hui Zhang. Micro structures and properties of AZ31 magnesium alloy processed by ECAE. Foundry technology, 2010, 31(5) : 638~639.

[7] JIN Li. Study on the microstructure and mechanical properties of magnesium alloy by equal channel angular extrusion. Shanghai: School of Materials Science and Engineering, Shanghai Jiao Tong University, 2006: 43−44.

[8] YU-Kun, LI Wen-xian, WANG Ri-chu. Plastic strain mechanism of magnesium alloy. The Chinese Journal of Nonferrous Metals, 2005, 15(7): 1081−1086.