2124铝合金蠕变时效本构方程  

Constitutive Equation Describing Creep Ageing of 2124 Aluminum Alloy

作　　者：湛利华[1] 李炎光[1] 黄明辉[1] 张猛[1] 

机构地区：[1]中南大学高性能复杂制造国家重点实验室,湖南长沙410012

出　　处：《华南理工大学学报（自然科学版）》2012年第4期107-111,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"973"计划项目(2010CB731700)

摘　　要：在185℃下,对2124铝合金试样进行了200、225和250MPa 3种应力水平下的多组单轴拉伸蠕变时效实验,发现在恒定温度下,实验应力越大,时效时间越长,蠕变行为就越明显;根据蠕变理论和实验曲线,建立了2124铝合金在185℃及不同应力水平下的本构方程;利用SPSS和Origin软件,得到了蠕变本构方程中的常数。蠕变实验数据点和拟合曲线的比较说明,所得的本构方程能较好地描述2124铝合金在185℃及不同应力条件下的蠕变行为.Uniaxial tensile creep ageing experiments of 2124 aluminum alloy specimens were carried out under the stress of 200, 225 and 250MPa at 185 ℃. It is found that, at a constant temperature, the creep behaviors become more distinct with the increase of experimental stress and ageing time. Then, according to the creep theory and the creep curves, a constitutive equation was established and was used to describe the creep behaviors of 2124 alumi- num alloy at 185 ℃ under different stress conditions. Moreover, the constants of the constitutive equation were de- termined with SPSS and Origin. By comparing the experimental data with the fitting curves, it is concluded that the proposed constitutive equation well describes the creep behaviors of 2124 aluminum alloy at 185℃ under different stress conditions.

关 键 词：2124铝合金 蠕变 本构方程 蠕变时效成形 

分 类 号：TG146.21[一般工业技术—材料科学与工程]