X2A66铝锂合金等温压缩时的流变变形行为  

Rheological Deformation Behavior of X2A66 AluminumLithium Alloy during Isothermal Compression

作　　者：翟彩华 冯朝辉[2] 柴丽华[1] 陆政[2] 聂祚仁[1] 陈子勇[1] 

机构地区：[1]北京工业大学,北京100124 [2]北京航空材料研究院,北京100095

出　　处：《稀有金属材料与工程》2017年第1期90-96,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(E041501)

摘　　要：采用Gleeble-3500热模拟试验机对X2A66合金进行等温热压缩实验,变形温度为623.15~743.15 K、应变速率为0.001~10 s^(-1),并利用双曲正弦函数和动态材料模型,建立合金峰值应力的本构方程和加工图。结果表明:X2A66合金的流变应力随温度的升高而减小,随应变速率的增加而增大;X2A66合金的温度敏感性不受应变速率的影响,高应变速率(应变速率高于0.1 s^(-1))时的速率敏感性高于低应变速率时的速率敏感性。X2A66合金等温压缩时峰值流变应力和应变速率之间满足双曲正弦函数关系,其本构方程为:e(5)=5.09×10~9[sinh(0.019σ)]^(4.54414)exp(–145.377/RT)。在实验工艺参数范围内,X2A66合金的失稳区集中在高应变速率区,当应变速率为0.01~0.3 s^(-1),温度为700~743 K时是耗散效率的峰值区域,也是X2A66合金最佳的热加工工艺区。An isothermal compression experiment of X2A66 alloy was carried out by a Gleeble-3500 thermal simulator within the deformation temperature range of 623.15～743.15 K and the strain rate range of 0.001～10 s～（-1）. The alloy peak stress constitutive equation and processing map were established by a hyperbolic sine function and a dynamic materials model. The results show that flow stress of the alloy decreases with the increase of deformation temperature while increases with the increase of strain rate. In addition, the strain rate has no effect on temperature sensitivity of X2A66 alloy; the rate sensitivity at high strain rate above 0.1 s（-1） is higher than that at low strain rate.In isothermal compression experiment of X2A66 alloy, the relationship between the peak flow stress and strain rate satisfies the hyperbolic sine function and the constitutive equation is e（5）=5.09 × 10^9[sinh（0.019σ）]～（4.54414）exp（–145.377/RT）. In the range of test parameters, the instability zones of X2A66 alloy are mainly concentrated in the area of high strain rate. The peak area of dissipation efficiency is in the strain rate range of 0.01～0.3 s（-1） and the deformation temperature range of 700～743 K, which is the best thermal processing zone for X2A66.

关 键 词：X2A66合金 等温压缩 本构方程 热加工图 

分 类 号：TG146.21[一般工业技术—材料科学与工程]