采用Gleeble-3500热模拟试验机对Mg-3.0Nd-0.2Zn-0.4Zr(质量百分数,NZ30K)合金进行等温热压缩试验,变形温度范围为350～500℃,应变速率范围为0.001～1 s-1.为消除变形热的影响t对高应变速率条件下的流变应力进行修正.利用修正后的流变应力数据,建立双曲正弦本构方程.双曲正弦本构方程中的常数可表达为应变的函数.利用建立的本构方程所预测的流变应力与实验结果吻合得较好,说明该本构方程可以用来预测NZ30K合金在热变形过程中的流变应力.
Isothermal hot compression tests were carried out on Mg-3.0Nd-0.2Zn-0.4Zr (mass fraction,％,NZ30K) alloy using a Gleeble-3500 thermo-simulation machine at temperatures ranging from 350 to 500 ℃ and strain rates from 0.001 to 1 s-1.A correction of flow stress for deformation heating at a high strain rate was carried out.Based on the corrected data for deformation heating,a hyperbolic sine constitutive eqtation was established.The constants in the constitutive equation of the hyperbolic sine form were determined as a function of strain.The flow stresses predicted by the developed equation agree well with the experimental results,which confirms that the developed constitutive equations can be used to predict the flow stress of NZ30K alloy during hot deformation.
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