摘要
用Instron-8032拉伸试验机,在变形温度为298~573 K、应变率为0.001~0.1 s^-1时,研究5754铝合金的流变行为。基于改进的Fields-Backofen方程,建立用于5754铝合金板料温拉伸本构模型。结果表明:应变率相同时,随温度升高,流变应力降低,伸长率升高,断口韧窝变深、变大;变形温度相同时,随应变率升高,流变应力升高,伸长率降低,断口韧窝变浅;当变形温度为573 K、应变率为0.001 s^-1时,铝合金板料流变应力出现明显软化现象,动态再结晶特征明显。本构模型计算结果与试验数据较吻合,可预测5754铝合金温成形流变行为。
The tensile rheological behavior of 5754 aluminum alloy at medium temperature ranging from 298 K to 573 K and strain rate ranging from 0.001 s-1 to 0.1 s-1 was studied by Instron-8032 tensile tester. Based on the modified Fields-Backofen equation,a constitutive model was established to describe the tensile rheological behavior of 5754 aluminum alloy at medium temperature. The results show that at the same strain rate,with the increase of temperature,the flow stress of the aluminum alloy sheets decreases,the elongation rate increases,and the dimple of fracture becomes deeper and larger. At the same deformation temperature,with the increase of strain rate,the flow stress increases and the elongation decreases,and the dimple of fracture becomes shallower. When the deformation temperature is 573 K and the strain rate is 0.001 s-1,the flow stress of aluminum alloy sheet shows obvious softening and dynamic recrystallization. The results of the constitutive model are in good agreement with the experimental data,which can be used to predict the tensile rheological behavior of 5754 aluminum alloy in the process of forming at medium temperature.
作者
罗嗣林
杨刚
徐永谦
LUO Silin;YANG Gang;XU Yongqian(Taizhou Vocational College of Seience and Technology,Taizhou 318020,China;Light Alloy Research Institute,Central South University,Changsha 410083,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2020年第6期21-25,共5页
Ordnance Material Science and Engineering
基金
青年科学基金(51905551)
台州市科技计划项目(2002gy14)。
关键词
5754铝合金
流变行为
温拉伸
本构模型
5754 aluminum alloy
rheological behavior
tension at medium temperature
constitutive model
