5A30铝合金板高温拉伸本构关系研究  

Constitutive Relationship of 5A30 Aluminum Alloy Sheet at Elevated Temperature

作　　者：汤振雷[1] 闫晓东[1] 李俊鹏[1] 许小静[1] 毛柏平[1] 沈健[1] 

机构地区：[1]北京有色金属研究总院有色金属加工工程研究中心,北京100088

出　　处：《稀有金属》2010年第4期516-520,共5页Chinese Journal of Rare Metals

摘　　要：采用拉伸试样在Gleeble-1500材料热模拟试验机上对5A30铝合金进行高温拉伸实验,研究了该合金在变形温度为300～500℃,应变速率在0.01～10 s-1的高温流变变形行为。结果表明:变形温度和应变速率对该合金流变应力的大小有显著影响。流变应力随变形温度的升高而降低,随着应变速率的增加而升高。5A30铝合金的高温流变行为可用Zener-Hollomon参数描述,从流变应力、应变速率和变形温度的相关性,得出了该铝合金板材高温变形的材料常数和本构方程。计算出5A30铝合金板的变形激活能为Q=201.1 kJ.mol-1,材料常数为A=7.44×1013 s-1,n=4.3135,α=0.02 mm2.N-1;计算得到了5A30铝合金Arrhenius方程;利用双曲正弦模型,得到高温拉伸峰值应力和Z参数的解析式。The elevated temperature flow stress features of 5A30 aluminum alloys sheet were studied by tensile deformation of speci-men at 300 ～ 500 ℃ and high temperature deformation at strain rate of 0.01 ～ 10 s-1 with Gleeble-1500 simulated machine.The re-sults showed that the flow stress was influenced dramatically by strain rate and deformation temperature.The flow stress increased with strain rate increase and decreased with deformation temperature increase.The flow stress of 5A30 aluminum alloy sheet during hig...

关 键 词：本构方程 ZENER-HOLLOMON参数 变形激活能 高温拉伸 

分 类 号：TG115.52[金属学及工艺—物理冶金]