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A modified Johnson-Cook constitutive relationship for a rare-earth containing magnesium alloy 被引量:14

A modified Johnson-Cook constitutive relationship for a rare-earth containing magnesium alloy
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摘要 Lightweight magnesium alloy has recently attracted a considerable interest in the automotive and aerospace industries to improve fuel efficiency and reduce CO2 emissions via the weight reduction of vehicles.Rare-earth(RE) element addition can remarkably improve the mechanical properties of magnesium alloys through weakening crystallographic textures associated with the strong mechanical anisotropy and tension-compression yield asymmetry.While the addition of RE elements sheds some light on the alteration in the mechanical anisotropy,available information on the constitutive relationships used to describe the flow behavior of RE-containing magnesium alloys is limited.To establish such a constitutive relationship,uniaxial compressive deformation tests were first conducted on an extruded Mg-10Gd-3Y-0.5Zr(GW103K) magnesium alloy at the strain rates ranging from 1×10–1 to 1×10–4s–1 at room temperature.A modified Johnson-Cook constitutive equation based on a recent strain hardening equation was proposed to predict the flow stresses of GW103K alloy.Comparisons between the predicted and experimental results showed that the modified Johnson-Cook constitutive equation was able to predict the flow stresses of the RE-containing magnesium alloy fairly accurately with a standard deviation of about 1.8%. Lightweight magnesium alloy has recently attracted a considerable interest in the automotive and aerospace industries to improve fuel efficiency and reduce CO2 emissions via the weight reduction of vehicles.Rare-earth(RE) element addition can remarkably improve the mechanical properties of magnesium alloys through weakening crystallographic textures associated with the strong mechanical anisotropy and tension-compression yield asymmetry.While the addition of RE elements sheds some light on the alteration in the mechanical anisotropy,available information on the constitutive relationships used to describe the flow behavior of RE-containing magnesium alloys is limited.To establish such a constitutive relationship,uniaxial compressive deformation tests were first conducted on an extruded Mg-10Gd-3Y-0.5Zr(GW103K) magnesium alloy at the strain rates ranging from 1×10–1 to 1×10–4s–1 at room temperature.A modified Johnson-Cook constitutive equation based on a recent strain hardening equation was proposed to predict the flow stresses of GW103K alloy.Comparisons between the predicted and experimental results showed that the modified Johnson-Cook constitutive equation was able to predict the flow stresses of the RE-containing magnesium alloy fairly accurately with a standard deviation of about 1.8%.
出处 《Journal of Rare Earths》 SCIE EI CAS CSCD 2013年第12期1202-1207,共6页 稀土学报(英文版)
基金 supported by Natural Sciences and Engineering Research Council of Canada(NSERC) Premier’s Research Excellence Award(PREA) NSERC-DAS Award,AUTO21 Network of Centers of Excellence Ryerson Research Chair Program Technology Support Project Program of the Ministry of Science and Technology of China(2011BAE22B02,2011DFA50907) National Natural Science Foundation of China(51171113) Canada-China-USA Collaborative Research Project on the Magnesium Front End Research and Development(MFERD)
关键词 magnesium alloy rare-earth element compression constitutive equation magnesium alloy rare-earth element compression constitutive equation
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