摘要
在Gleeble 1500D热模拟仪上进行热压缩实验,研究Al-4.7Mg-0.7Mn-0.1Zr-0.4Er合金高温变形行为,变形温度为300500℃,变形速率为0.001-10 s^-1,变形后总应变量为0.7。变形温度高于400℃时,真应力-真应变曲线呈现稳态流变,在其他温度下变形真应力-真应变曲线表现为加工硬化。根据动态材料模型建立合金的加工图,在400-500℃和0.001-0.1 s^-1变形时加工图上出现一个发生动态回复的峰区,相应的变形激活能为176 kJ/mol,大于纯铝的自扩散激活能,表明合金在该区域变形的机制是位错的交滑移。变形失稳区的组织特征是局部变形。
The hot deformation behavior of Al-4.7Mg-0.7Mn0.1Zr-0.4Er alloy was investigated.Compression tests were performed on a Gleeble 1500D thermal simulator system in the temperature range of 300-（500 ℃） and strain rates of 0.001-10 s^-1 with a total strain of 0.7.The flow curves exhibite steady state flow behavior at temperature higher than（400 ℃,） and at other temperatures the alloy is characterized by strain hardening.The processing map was created based on the dynamic materials model and it predicts that the dynamic recovery of the alloy mainly occurs in a region with temperature of 400-（500 ℃） and stain rates of 0.001-0.1 s^-1.The corresponding apparent activation energy estimated in the region is 176 kJ/mol,which is higher than that for self-diffusion in pure aluminum,suggesting that cross-slip of dislocations is the deformation mechanism.The flow instable region reveals local deformation feature.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2010年第2期95-99,共5页
Transactions of Materials and Heat Treatment
基金
国家高技术发展计划资助项目(2006AA03A207)
国家重点基础研究发展规划资助项目(2005CB623706)
关键词
高温变形
加工图
动力学分析
稀土元素铒
hot deformation
processing map
kinetic analysis
rare earth erbium
