Al-14Cu-7Ce合金高温流变应力预测模型（英文）  

Modeling for Predicting Flow Stress of Al-14Cu-7Ce Alloy at Elevated Temperature

作　　者：王芝秀[1,2,3] 李海[1,2] 孙王杰[1,2] 苗芬芬[1,2] 宋仁国[1,2] 郑子樵[3] 

机构地区：[1]常州大学,江苏常州213164 [2]常州市先进金属重点实验室,江苏常州213164 [3]中南大学,湖南长沙410083

出　　处：《稀有金属材料与工程》2014年第6期1300-1303,共4页Rare Metal Materials and Engineering

基　　金：National Basic Research Program of China(2005CB623705)

摘　　要：在应变速率0．001～1s^-1、温度573～823K的条件下，采用Gleeble3500热模拟试验机对Al-14Cu-7Ce合金进行等温热压缩实验，并根据真应力．真应变的计算数值，建立了Al-14Cu-7Ce合金高温流变应力本构方程。结果表明，流变应力符合速率方程ε=A D1Gb/κT [sinh （α1σ/G）]^n；其中，应变的影响通过多项式拟合方式耦合进入材料常数A，αL和n。所建立的本构方程能够准确预测Al-14Cu-7Ce合金高温流变应力，实验条件下控制合金热变形的主要机制是位错攀移。Isothermal hot compression tests of annealed Al-14Cu-7Ce alloy were carried out on Gleeble-3500 system in the temperature range from 573 K to 823 K and the stain rate range from 0.001 s^-1 to 1 s^-1. The resulted true stress-true strain data were employed to establish a constitutive equation for predicting high temperature flow stress. The results show that the flow stress follow well the rate equation ε=A D1Gb/κT [sinh （α1σ/G）]^n. The effect of strain was taken into account by fitting of polynomials into the material parameters A, αL and n. The proposed constitutive equation can predict precisely high temperature flow stress of Al-14Cu-7Ce alloy. The control mechanism of hot deformation is dislocation climb.

关 键 词：Al-14Cu-7Ce合金 流变应力 应变补偿 

分 类 号：TG146.21[一般工业技术—材料科学与工程]