3003铝合金热变形流变应力特征  

Flow Stress Feature of 3003 Aluminium Alloy Under Hot Deformation

作　　者：吴文祥[1] 孙德勤[1] 张辉[2] 曹春艳[1] 王战锋[2] 

机构地区：[1]苏州有色金属加工研究院,江苏苏州215026 [2]湖南大学材料科学与工程学院,湖南长沙410083

出　　处：《热加工工艺》2007年第6期12-14,17,共4页Hot Working Technology

基　　金：中国铅业公司科技发展基金资助项目(2006KJA08)

摘　　要：采用Gleeble-1500热模拟机进行圆柱体压缩实验,研究了3003铝合金在变形温度为300～500℃、应变速率为0.01～10 s-1、真应变为0～0.8条件下的流变应力特征。结果表明,流变应力随温度升高而降低,随应变速率的提高而增大;在应变速率小于10 s-1时,3003铝合金首先出现加工硬化,流变应力达到峰值后单调下降,趋于平稳,表现出动态回复的特征;而在应变速率为10 s-1、变形温度在350℃以上时,合金发生了局部动态再结晶;可用Zener-Hollomon参数的双曲正弦形式来描述3003铝合金热压缩变形时的流变应力行为。The cylindrical compression tests was carried out by using Gleeble 1500 system, the flow stress feature of 3003 aluminium alloy under hot deformation was investigated under the condition of temperature 300-500℃ ,strain rate 0.01-10 s^-1 and true strain 0-0.8.The results show that the flow stress increases with the decrease of temperature and the increase of strain rate ;when strain rate is less than 10 s^-1,the deformation of 3003 alloy shows working hardening,flow stress is up to a peak stress followed by a monotomic decrease to a steady state value,showing dynamic recovery;when strain rate is 10 s^-1 and temperature is higher than 350℃ ,the flow curve exhibits partial dynamic recrystallization. The flow stress of 3003 alloy during hot compression deformation can be represented by a Zener-Hollomon parameter of the hyperbolic sine form.

关 键 词：3003铝合金 热变形 流变应力 Zenner-Hollomon参数 

分 类 号：TG146.21[一般工业技术—材料科学与工程]