Constitutive Equation and Apparent Viscosity Equation of Semi-solid 7050 Aluminum Alloy

Yang Lidong; Pan Cunliang; Wang Lingjiao; Zhang Zhifeng; Qu Shengguan; Li Xiaoqiang

doi:10.15980/j.tzzz.2022.10.011

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Constitutive Equation and Apparent Viscosity Equation of Semi-solid 7050 Aluminum Alloy
Vol. 42, Issue 10, Pages: 1250-1255(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.10.011

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Yang Lidong, Pan Cunliang, Wang Lingjiao, et al. Constitutive Equation and Apparent Viscosity Equation of Semi-solid 7050 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 42(10):1250-1255(2022)
DOI：

Yang Lidong, Pan Cunliang, Wang Lingjiao, et al. Constitutive Equation and Apparent Viscosity Equation of Semi-solid 7050 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 42(10):1250-1255(2022) DOI： 10.15980/j.tzzz.2022.10.011.

摘要

针对电磁搅拌法制备的半固态7050铝合金铸锭进行了热模拟试验，研究了变形温度为490～520℃、应变速率为0.1～10 s

-1

下的合金的变形行为，并建立了引入修正项的Arrhenius型本构方程。根据热模拟试验中应变速率、载荷等参数间的联系，建立了半固态表观粘度方程，研究了表观粘度与剪切速率、温度的关系。结果表明，材料的峰值流变应力随变形温度的升高而减小，随应变速率的降低而减小。引入修正项后本构方程和表观粘度方程预测值和试验值的平均相对误差(ARE)分别为2.3%和4.1%。

Abstract

The thermal simulation was carried out for the semi-solid 7050 aluminum alloy ingot prepared by electromagnetic stirring method. The deformation behavior of the alloy under the deformation temperature of 490～520 ℃ and the strain rate of 0.1～10 s

-1

was investigated

and the constitutive equation of Arrhenius type with modified term was established. According to the relationship between parameters such as strain rate

load and strain in the thermal simulation

the semi-solid apparent viscosity equation was established

and the relationship between the apparent viscosity of the semi-solid material and the shear rate or temperature was analyzed. The results indicate that the peak stress value of the material is decreased with the increase of deformation temperature and the decrease of strain rate. After introducing the modified term

the average relative error（ARE） between the predicted and the experimental value of the constitutive equation and semi-solid apparent viscosity equation is 2.3% and 4.1%

respectively.