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首页> 外文期刊>Journal of Materials Engineering and Performance >The Effect of Deformation Heating on Restoration and Constitutive Equation of a Wrought Equi-Atomic NiTi Alloy
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The Effect of Deformation Heating on Restoration and Constitutive Equation of a Wrought Equi-Atomic NiTi Alloy

机译：变形加热对变形的等原子NiTi合金的恢复和本构方程的影响

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摘要

In this study, a set of constitutive equation corrected for deformation heating is proposed for a near equiatomic NiTi shape memory alloy using isothermal hot compression tests in temperature range of 700 to 1000℃ and strain rate of 0.001 to 1 s~(-1). In order to determine the temperature rise due to deformation heating, Abaqus simulation was employed and varied thermal properties were considered in the simulation. The results of hot compression tests showed that at low pre-set temperatures and high strain rates the flow curves exhibit a softening, while after correction of deformation heating the softening is vanished. Using the corrected flow curves, the power-law constitutive equation of the alloy was established and the variation of constitutive constants with strain was determined. Moreover, it was found that deformation heating introduces an average relative error of about 9.5% at temperature of 800℃ and strain rate of 0.1 s~(-1). The very good agreement between the fitted flow stress (by constitutive equation) and the measured ones indicates the accuracy of the constitutive equation in analyzing the hot deformation behavior of equi-atomic NiTi alloy.
机译：本研究通过在700至1000℃的温度范围内和0.001至1 s〜（-1）的应变速率下进行等温热压缩试验，针对近等原子NiTi形状记忆合金，提出了一套经变形加热校正的本构方程。为了确定由于变形加热而引起的温度升高，采用了Abaqus仿真，并在仿真中考虑了各种热特性。热压缩测试的结果表明，在较低的预设温度和较高的应变速率下，流动曲线会显示出软化，而在校正变形加热后，软化消失了。使用校正后的流动曲线，建立了合金的幂律本构方程，并确定了本构常数随应变的变化。此外，发现在800℃的温度和0.1 s〜（-1）的应变速率下，形变加热的平均相对误差约为9.5％。拟合流动应力（通过本构方程）与实测应力之间的良好一致性表明，本构方程在分析等原子NiTi合金热变形行为中的准确性。

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