Journal
MATERIALS LETTERS
Volume 65, Issue 6, Pages 944-947Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2011.01.001
Keywords
Magnesium alloys; Mechanical properties; Microstructure; Dynamic precipitation; Extrusion
Funding
- Chongqing Science and Technology Commission [2008BA4036, 2009AB4007]
- Natural Science Foundation of China [50725413]
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The elevated-temperature plasticity and flow behavior of an Er-modified, heat-resistant ZA73 alloy was evaluated by thermal simulation. The results showed that the addition of Er to ZA73 alloy notably improves the deformability and higher strain rate and temperature favors hot deformation. Bars with sound surface quality were successfully extruded at 350 degrees C and a strain rate of similar to 0.1 s(-1). Furthermore, dynamic precipitation of nano-sized spherical tau phase was found to occur uniformly in the alpha-Mg matrix during hot extrusion, which is considered helpful to both strength and plasticity enhancement. The yield strength and ultimate tensile strength of the as-extruded bars reached 240-265 MPa and 355-360 MPa, respectively, while maintaining a large elongation rate of 18-19.5%. (C) 2011 Elsevier B.V. All rights reserved.
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