摘要
采用圆柱试样在Gleeble-1500热／力模拟试验机上进行高温压缩变形试验，研究了2124铝合金在高温塑性变形过程中流变应力的变化规律。试验在变形温度为350～480℃、应变速率0.01～10s^-1的条件下进行。结果表明：应变速率和变形温度的变化对合金稳态流变应力有明显的影响，在低应变速率条件下，流变应力开始随应变增加而增大，达到峰值后趋于平稳，表现出近稳态特征；而在高应变速率条件下，应力出现强烈锯齿波动，达到峰值后随着应变的增加锯齿波动趋于平缓；2124铝合金高温塑性变形时的流变行为可用Zener—Hollomon参数的双曲正弦函数来描述。
The rheological behavior of 2124 aluminum alloy during high temperature plastic deformation was studied by isothermal compression of cylindrical specimens using Gleeble-1500 thermal-mechanical simulator. The tests were performed in the temperature range between 350 and 480 ℃ and strain rates between 0.01 and 10 s^-1. The experimental results indicated that the rheological stress was influenced by both strain rates and deformation temperature,and it increased with increasing strain and tends to be constant after a peak value at lower strain rates （s^-1）. The rheological stress sawtooth fluctuates strongly and the fluctuation of stress sawtooth decrease after a peak value with increasing temperature at higher strain rates（s^-1）. The rheological behavior of 2124 aluminum alloy during high temperature deformation can be represented by a Zener-Hollomon parameter in the hyperbolic Arrhenius-type equation.
出处
《湖南有色金属》
CAS
2007年第5期26-29,共4页
Hunan Nonferrous Metals
关键词
2124铝合金
流变应力
热压缩变形
变形激活能
2124 Aluminum alloy
rheological stress
hot - compression deformation
deformation activation energy
