25vol%B_4Cp/2009Al复合材料热变形本构模型（英文）  

Constitutive Analysis to Predict High-Temperature Flow Stress of 25vol% B_4Cp/2009Al Composite

作　　者：刘生璞 李德富[1] 贺金宇[1] 郭胜利[1] 

机构地区：[1]北京有色金属研究总院,北京100088

出　　处：《稀有金属材料与工程》2017年第10期2831-2836,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51205028)

摘　　要：对25vol%B_4Cp/2009Al复合材料进行等温压缩实验,采用的温度范围为300~500℃,应变速率范围为0.001~1 s^(-1)。结果表明,B_4Cp/2009Al复合材料的高温流变应力随着变形温度的升高和应变速率的减小而下降。对流变曲线进行了摩擦修正,修正后的流变应力值低于实验结果。摩擦力的影响随着温度的降低和应变速率的增大而更明显。随后构建了基于Arrhenius形式的本构方程,求解了不同应变量下的材料常数(α,n,Q和A)。与实验结果进行对比,利用构建的本构方程计算得到的流变应力值具有很高的计算精度,相关系数达到0.992。研究发现,较高的温度和较低的应变速率有助于B_4Cp/2009Al复合材料的高温热变形。Isothermal compression tests of 25 vol% B_4Cp/2009 Al composite have been carried out at temperatures ranging from 300℃ to 500℃ and strain rates ranging from 0.001 s^（-1） to 1 s^（-1）. The results show that high-temperature flow stress of the composite decreases with the increase of deformation temperature and the decrease of strain rate. The flow stress has been corrected by friction and the friction corrected stress is lower than experimental values. The influence of friction becomes more obvious with decreasing temperature and increasing strain rate. Then a constitutive equation considering the effect of strain on material constants（i.e. α, n, Q and A） is developed on the basis of Arrhenius type equation. Compared with the experimental results, the flow stress calculated by the constitutive equation possesses a high precision with the correlation coefficient of 0.992. Higher temperature and lower strain rate is beneficial to hot deformation of B_4Cp/2009 Al composite.

关 键 词：B4Cp/2009Al复合材料 热变形行为 本构方程 流变应力预测 

分 类 号：TB33[一般工业技术—材料科学与工程]