Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 26, Issue 12, Pages 3123-3134Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(16)64444-8
Keywords
Mg-Zn-Er alloy; compression behavior; microstructure evolution; constitutive equations; processing map
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Funding
- Beijing Natural Science Foundation, China [2142005]
- National Natural Science Foundation of China [51401005]
- Beijing Municipal Commission of Education, China [KM201410005014]
- RiXin Talents Plan of Beijing University of Technology, China [2015-RX-L11]
- Advanced Medical Instruments of Beijing University of Technology, China [009000514316007]
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The hot deformation behaviors of as-solution Mg-xZn-yEr alloys (x/y= 6, x=3.0, 4.5 and 6.0; y=0.50, 0.75 and 1.00) were investigated on Gleeble-1500 thermal simulator in a temperature range of 200-450 degrees C at a strain rate of 0.001-1 s(-1). The true stress-strain curves showed the dynamic competition between the working hardening and working softening mainly due to the dynamic recrystallization (DRX) occurring during hot compression. The constitutive equations were constructed which could accurately predict the peak stress of the alloys. The addition of Zn and/or Er resulted in higher deformation activation energy for Mg-3Zn-0.5Er ( alloy A). The processing maps were constructed as function of the temperature and the strain rate, providing the optimum hot working conditions (i.e., at strain of 0.3, Mg-3Zn-0.5Er (alloy A): 380-430 degrees C, <0.1 s(-1); Mg-4.5Zn-0.75Er ( alloy B): 380- 450 degrees C, 0.01-0.1 s(-1); Mg-6Zn-1Er (alloy C): 390- 440 degrees C, 0.01-0.1 s(-1)). The as-solution treated Mg-4.5Zn-0.75Er (alloy B) demonstrated more optimum hot working window comparing with Mg-3Zn-0.5Er (alloy A) and Mg-6Zn-1Er (alloy C).
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