AZ31镁合金电塑性流动应力模型  

AZ31 magnesium alloy electro-plastic flow stress model

作　　者：赵达[1] 董湘怀[1] 谢焕阳[1] 霭振球[1] 

机构地区：[1]上海交通大学塑性成形技术与装备研究院,上海200030

出　　处：《模具技术》2013年第3期7-12,共6页Die and Mould Technology

基　　金：国家自然科学基金资助项目(51275297);教育部博士点专项基金资助项目(20100073110044)

摘　　要：材料流动应力模型是金属成形数值模拟的重要参数之一。基于温度为373～433K、应变速率为1/300～1/75s-1、通电电压为60～100V和通电频率为120～200Hz的条件,对AZ31镁合金的流动应力变化规律进行了单向拉伸试验研究。通过对Fields-Backofen的本构方程进行修正,引入充电电压和通电频率2个电参数,建立了镁合金的电塑性流动应力模型。结果表明:修正后的模型计算结果能很好地模拟AZ31镁合金的电塑性加工流动应力的变化规律。Material flow stress model is one of the important parameters of metal forming numerical simulation. The uniaxial tensile tests were carried out under a strain rate range of 1/300-1/75 s -1 at a temperature range of 373-433 K, a charging voltage range of 60- 100 V and a charging frequency range of 120-200 Hz in order to evaluate the flow stress of AZ31 magnesium alloy sheet. By modifying the Fields-Backofen constitutive equation, a new flow stress model containing charging voltage and charging frequency was established. The results indicate that the revised model can get a good simulation result for the flow stress changing law of AZ31 magnesium electro-plastic deformation.

关 键 词：AZ31镁合金 电塑性效应 流动应力模型 

分 类 号：TG135[一般工业技术—材料科学与工程]