7085铝合金的热变形动态再结晶行为（英文）

发布时间：2018-01-10 06:22

本文关键词：7085铝合金的热变形动态再结晶行为（英文）　出处：《Transactions of Nonferrous Metals Society of China》2016年06期 　论文类型：期刊论文

【摘要】：通过电子背散射衍射(EBSD)、电子探针(EPMA)和透射电子显微镜(TEM)研究7085铝合金在温度573~723 K、变形速率0.01~10 s~(-1)条件热压缩时的动态再结晶行为。结果表明,在高Zener-Hollomon(Z)值时,动态回复是主要的软化机制;随着Z参数值降低,出现动态再结晶。在ln Z=24.01(723 K,0.01 s-1)热压缩时,动态再结晶分数最高,为10.2%。EBSD结果表明,再结晶晶粒出现在初始晶界附近,其取向与变形晶粒接近。应变诱发晶界迁移是最可能的动态再结晶机制。晶界附近的低密度Al_3Zr弥散粒子有利于应变诱发晶界迁移的发生。
[Abstract]:Electron backscattering diffraction (EBSD), electron probe spectroscopy (EPMA) and transmission electron microscopy (TEM) were used to study the temperature of 7085 aluminum alloy. The dynamic recrystallization behavior of the deformation rate of 0. 01 ~ 10 s-1) under hot compression conditions. The results show that the dynamic recrystallization behavior is higher than that of Zener-Hollomonn (Z) value. Dynamic recovery is the main softening mechanism. With the decrease of Z parameter, dynamic recrystallization occurs, and the dynamic recrystallization fraction is the highest under the thermal compression of ln ZN 24.01U 723KN 0.01s-1.The dynamic recrystallization fraction is the highest when the Z parameter decreases. EBSD results show that recrystallized grains appear near the initial grain boundary. The grain boundary migration induced by strain is the most likely dynamic recrystallization mechanism, and the low density Al_3Zr particles near the grain boundary are favorable to the strain-induced grain boundary migration.
【作者单位】：中南大学材料科学与工程学院;中南大学有色金属材料科学与工程教育部重点实验室;湖南工程学院机械工程学院;中南大学有色金属先进结构材料与制造协同创新中心;
【基金】：Project(2012CB619500)supported by the National Basic Research Program of China
【分类号】：TG146.21
【正文快照】： 1 Introduction Dynamic recrystallization(DRX)often occurs in aluminum and aluminum alloys during hot deformation,andgenerallytherearecontinuousdynamic recrystallization(CDRX)and discontinuous dynamic recrystallization(DDRX)[1,2].In most aluminum alloys,

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