National Center for Magnesium Alloy Engineering Research

Chongqing, China

National Center for Magnesium Alloy Engineering Research

Chongqing, China

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Li W.,National Center for Magnesium Alloy Engineering Research | Li W.,Chongqing University | Gao J.-C.,National Center for Magnesium Alloy Engineering Research | Gao J.-C.,Chongqing University
Cailiao Gongcheng/Journal of Materials Engineering | Year: 2011

Effects of Nd on microstructure and mechanical properties of extruded Mg-5.0Y-xNd-0.6Zr (x=0, 1.0, 2.6, 4.2, mass fraction/%, the same below) alloy were investigated by optical microscopy(OM), scanning electron microscopy(SEM), X-ray diffraction(XRD) and tensile testing. The results showed that with addition of Nd, the banding particles of β and Mg24Y5 phase in the extruded alloy increased, which promoted the nucleation of dynamic recrystallization, the volume fraction of recrystallization advanced, and the average grain size of recrystallization could be refined from 4.5 μm to 2.6 μm. The tensile strength and yield strength of extruded alloy increased with increment of Nd, the maximum values of them were 303 MPa and 262 MPa respectively. The elongation and section shrinkage conspicuous decreased from 24.7% and 39.9% to 12% and 16.7% with increasing Nd content. The extruded alloy displayed better strength and plasticity at Nd content of 2.6%.


Li W.,National Center for Magnesium Alloy Engineering Research | Li W.,Chongqing University | Gao J.-C.,National Center for Magnesium Alloy Engineering Research | Gao J.-C.,Chongqing University
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2011

The flow stress behavior of Mg-6.5Y-2.5Nd-0.6Zr alloy was studied during hot compression deformation on a Gleeble-1500 thermal-mechanical simulator at 623-773 K, strain rates from 0.01 to 1.0 s-1 and maximum deformation of 60%. The results show that the maximum temperature rising induced by deformation heat is 25 K during isothermal compression in strain rate of 1.0 s-1, and the corrected flow stress is 31.2 MPa higher than the measured value. The corrected flow stress decreases first then increases compared with the measured values during hot compression in strain rate of 0.1 s-1, and their difference is less than 7.8 MPa. A flow stress constitutive equation was constituted based on Arrhenius equation containing hyperbolic sine function and Zener-Hollomon parameter. Using the constitutive equation, the calculated peak stresses agree well with the corrected experimental stress values under the experimental condition, and their relative error is not more than 5%.

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