应用加工图表征AA2014锻造铝合金的热变形行为（英文）

发布时间：2018-04-07 16:54

  本文选题：AA铝合金　切入点：热变形行为　出处：《Transactions of Nonferrous Metals Society of China》2017年08期

【摘要】：通过等温压缩试验研究AA2014锻造铝合金的热变形行为。试验在Gleeble-3180热模拟机上进行,温度和应变速率范围分别为350~480°C和0.001~1 s~(-1)。利用金相显微镜(OM)、电子背散射衍射(EBSD)、透射电子显微镜(TEM)等分析手段观察合金在不同变形条件下的显微组织,并构建应变为0.1、0.3、0.5和0.7时的加工图。结果表明:高应变速率(0.1 s~(-1))时易出现失稳变形区,并以局部不均匀变形为主要失稳形式。当应变为0.7时,加工图中存在两个稳定变形区:I区(350~430°C,0.005~0.1 s~(-1))和Ⅱ区(450~480°C,0.001~0.05 s~(-1)),其主要软化机制均为动态回复。在变形区I中得到均匀的显微组织,在变形区Ⅱ中发生扩展回复,这将导致潜在的亚晶界逐步转变为新的大角度晶界。AA2014锻造铝合金的最佳热加工参数如下:温度370~420°C,应变速率0.008~0.08 s~(-1)。
[Abstract]:The hot deformation behavior of AA2014 forged aluminum alloy was studied by isothermal compression test.The test was carried out on a Gleeble-3180 thermal simulator. The temperature and strain rate ranges were 350 480掳 C and 0.001g / s ~ (-1) ~ (-1), respectively.The microstructure of the alloy under different deformation conditions was observed by means of metallographic microscope, electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM).The results show that the unstable deformation zone is easy to occur at high strain rate (0.1 s-1), and the local inhomogeneous deformation is the main form of instability.When the strain is 0.7, there are two stable deformation zones in the processing diagram, one is 350,430 掳C ~ (0. 005C ~ (1)) and the other is area 鈪，

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