摘要
采用Gleeble-1500热模拟试验机对经高效熔体处理的3003铝合金进行变形温度为300℃～500℃,应变速率为0.01～10.0 s-1的等温压缩实验,建立了动态再结晶平均晶粒尺寸与变形温度和应变速率的三维关系图.通过显微维氏硬度测试表明,3003铝合金热变形后的显微硬度随应变速率的增大和变形温度的升高而降低,且显微维氏硬度随动态再结晶平均晶粒尺寸的减小而增大.TEM形貌像表明,当变形温度T≥400℃,应变速率.ε≥1.0 s-1时,合金中粗大的AlMnFe和AlMnSi第二相在铝基体中不均匀分布,在动态再结晶过程中起到了粒子促进形核作用.显微维氏硬度的变化与微观组织观察结果一致.
The isothermal and constant strain rate compression tests of 3003 aluminum alloys were conducted in the range of 300 ～500℃ and 0.01～ 10.0 s-1 by Gleeble - 1500 thermal simulator. The plot of average recrys- tallization grain size, temperature and strain rate was built. The microhardness decreases with the strain rate and temperature increasing;furthermore the microhardness increases with the average recrystallization grain size decreasing. It is indicated by TEM images that the large and diffused precipitated phases A1MnFe and A1MnSi are distributed unevenly in the aluminum matrix in the conditions of T≥400 ℃ and ε≥ 1.0 s-1 ,which play a role of particle stimulation on the nucleation （PSN）during the process of dynamic recrystallization （DRX）. It is found that the microhardness changes are in good agreement with the results of microstructure observation.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2012年第5期116-120,共5页
Materials Science and Technology
基金
福建省自然科学基金资助计划项目(E0610004)
福建省教育厅A类科技项目(JA08249)
