本文關(guān)鍵詞：7085鋁合金的熱變形動態(tài)再結(jié)晶行為（英文）　出處：《Transactions of Nonferrous Metals Society of China》2016年06期 　論文類型：期刊論文

  更多相關(guān)文章： 鋁合金 Zener-Hollomon參數(shù) 動態(tài)再結(jié)晶 應(yīng)變誘發(fā)晶界遷移 AlZr彌散粒子

【摘要】：通過電子背散射衍射(EBSD)、電子探針(EPMA)和透射電子顯微鏡(TEM)研究7085鋁合金在溫度573~723 K、變形速率0.01~10 s~(-1)條件熱壓縮時的動態(tài)再結(jié)晶行為。結(jié)果表明,在高Zener-Hollomon(Z)值時,動態(tài)回復(fù)是主要的軟化機制;隨著Z參數(shù)值降低,出現(xiàn)動態(tài)再結(jié)晶。在ln Z=24.01(723 K,0.01 s-1)熱壓縮時,動態(tài)再結(jié)晶分數(shù)最高,為10.2%。EBSD結(jié)果表明,再結(jié)晶晶粒出現(xiàn)在初始晶界附近,其取向與變形晶粒接近。應(yīng)變誘發(fā)晶界遷移是最可能的動態(tài)再結(jié)晶機制。晶界附近的低密度Al_3Zr彌散粒子有利于應(yīng)變誘發(fā)晶界遷移的發(fā)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.
【作者單位】： 中南大學材料科學與工程學院;中南大學有色金屬材料科學與工程教育部重點實驗室;湖南工程學院機械工程學院;中南大學有色金屬先進結(jié)構(gòu)材料與制造協(xié)同創(chuàng)新中心;
【基金】：Project(2012CB619500)supported by the National Basic Research Program of China
【分類號】：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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