摘要
在Gleeble-1500热模拟机上,对5083铝合金进行高温等温压缩热模拟,分析了流变应力与应变速率、变形温度之间的关系和高温变形的内在机理,同时也对合金元素对流变应力的影响进行了分析。结果表明:在应变速率为0．01 s-1、0．1 s-1、1 s-1(400℃、450℃)和0．01 s-1(350℃),其流变应力出现明显的峰值应力,表现出连续动态再结晶特征;在0．1 s-1、1 s-1(350℃),表现为稳态流变,为动态回复。采用双曲正弦形式的Arrhenius关系来描述5083铝合金高温变形时的流变应力,获得5083的材料常数A、α、n和Q分别为0．06918s-1、0．01002MPa-1、3．2819和149．67kJ／mol。在不同的应变率比值下计算应变率敏感(SRS)系数(m=d1nσ／d1nε),发现随着温度升高,应变增大,m值增大。
The flow stress behavior of 5083 aluminum alloy during hot compression deformation was studied by Gleeble-1500 thermal mechanical simulator,the effect of alloying elements on the flow stress was also analyzed. The result shows that the flow stresses havea peak value when the strain rate is0.01s^-1,0.1s 1,is ^-1（400 ℃,450℃ ） and 0.01 s ^-1 （350 ℃）, showing continuous dynamic reerystallization. The steady state flow characteristics are re vealed when the strain rate is 0. ls^-1 ,1s ^-1 （350℃） ,showing dynamic recovery. The flow stress of 5083 aluminum alloy during hot deformation can be expressed by Arrhenius function,and the values of A,α,n and Q are 0. 06918s ^-1 , 0. 01002 MPa-1 ,3. 2819 and 149.67 KJ/mol respectively. It was shown that the strain rate suseeptivity（SRS） increased with temperature and strain.
出处
《铝加工》
CAS
2006年第6期1-6,共6页
Aluminium Fabrication
基金
国家"十五"科技军工配套项目(YS-005-06)
关键词
5083铝合金
高温变形
热模拟
流变应力
5083 alluminum alloys hot deformatiou
hot simulation
flow stress
