半固态7050铝合金本构方程及表观粘度方程研究  

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

作　　者：杨立栋 潘存良 王令姣 张志峰 屈盛官[1] 李小强[1] Yang Lidong;Pan Cunliang;Wang Lingjiao;Zhang Zhifeng;Qu Shengguan;Li Xiaoqiang(National Engineering Research Center for Near-Net-Shape for Metallic Materials,South China University of Technology;GRIMAT Engineering Institute Co.,Ltd.)

机构地区：[1]华南理工大学国家金属材料近净成形工程技术研究中心,广州510640 [2]有研工程技术研究院有限公司

出　　处：《特种铸造及有色合金》2022年第10期1250-1255,共6页Special Casting & Nonferrous Alloys

基　　金：军品配套科研资助项目(x2jqA2200270);佛山市核心技术攻关项目(1920001000412)。

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%。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 swas 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.

关 键 词：半固态成形 7050铝合金 本构方程 表观粘度方程 

分 类 号：TG146.21[一般工业技术—材料科学与工程]