Recrystallization process of hot-extruded 6A02 aluminum alloy in solid and semi-solid temperature ranges
Recrystallization process of hot-extruded 6A02 aluminum alloy in solid and semi-solid temperature ranges
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热挤压6A02铝合金在固态和半固态温度范围内的再结晶过程
DOI：
10.1016/j.jallcom.2021.162311
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发表时间：
2021-10
影响因子：
6.2
通讯作者：
Minjie Huang
中科院分区：
文献类型：
--
作者：
Ying Zhang;Jufu Jiang;Ying Wang;Guanfei Xiao;Yingze Liu;Minjie Huang
为了给半固态坯料的制备提供工艺参数，研究了加热温度对热挤压6A 02铝合金在固态和半固态温度范围内再结晶的影响。由于初始热挤压试样的变形率较低，在半固态温度下甚至发生了静态再结晶。在630 °C时几乎所有的细长晶粒都转变为等轴晶粒。但并不是所有的等轴晶都是纯再结晶晶粒，甚至在等轴晶内部还出现了细小的静态再结晶晶粒。大量不溶的第二颗粒，包括铁，锰，和硅分布在晶界。随着加热温度的升高，维氏硬度先升高后降低，最后升高。且与外力方向有关。电子背散射衍射（EBSD）分析表明，在540 °C时，再结晶、亚结构和变形晶粒的比例变化不大，而在600 °C和630 °C时变化较大。纤维<111><100>变形织构和{100}<001>立方织构的含量变化趋势相似.从晶粒和核的角度来看，位错密度随温度的升高而降低。单个晶粒存在不均匀变形。Schmid因子与外力方向相关性较大，等轴组织使间隙变窄。在等温变形试验中，剪切变形区液膜增厚，出现空洞。
To provide the process parameters for preparing semi-solid billets, the impacts of heating temperature on recrystallization of a hot-extruded 6A02 aluminum alloy in solid and semi-solid temperature ranges were studied. The static recrystallization (SRX) even occurred at semi-solid temperature due to the low deformation ratio in the starting hot-extruded sample. Almost all elongated grains were transformed into equiaxed grains at immediate 630 °C. But not all grains with equiaxed shape were pure recrystallized grains, and small static recrystallized grain even emerged inside them. Bulk insoluble second particles including Fe, Mn, and Si were distributed at the grain boundaries. With the increasing of heating temperature, Vickers hardness increased firstly, then decreased and increased finally. And it was relevant with external force direction. According to the electron backscatter diffraction (EBSD) analysis, the fraction of the recrystallized, sub-structured and deformed grains changed little at 540 °C, but varied greatly at 600 °C and 630 °C. The contents of<111> and<100> fiber deformed textures as well as {100}<001> Cube texture showed analogical variation tendencies. The dislocation densities decreased roughly with temperature both from grain-based and kernel-based perspectives. Inhomogeneous deformation existed in an individual grain. Schmid factor had great relevance with external force direction and the gaps were narrowed by the equiaxed microstructure. In the isothermal deformation test, the liquid film was thickened and voids emerged in the shear-deformation region.
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影响因子：
4.4
作者：
F. Qiang;E. Bouzy;H. Kou;Yudong Zhang;Lingling Wang;Jinshan Li
通讯作者：
F. Qiang;E. Bouzy;H. Kou;Yudong Zhang;Lingling Wang;Jinshan Li
影响因子：
1.4
作者：
H. Heshmati;M. Ketabchi;A. Kalaki;M. Tahriri;M. Ashuri
通讯作者：
H. Heshmati;M. Ketabchi;A. Kalaki;M. Tahriri;M. Ashuri
影响因子：
4.6
作者：
Xusheng Yang;L. Chai;Wei-jiu Huang;Yanlong Ma;Zhenhao Zhang
通讯作者：
Xusheng Yang;L. Chai;Wei-jiu Huang;Yanlong Ma;Zhenhao Zhang
影响因子：
2.4
作者：
Atkinson, H. V.;Burke, K.;Vaneetveld, G.
通讯作者：
Vaneetveld, G.
影响因子：
9.4
作者：
K. Kareh;C. O’Sullivan;T. Nagira;H. Yasuda;C. Gourlay
通讯作者：
K. Kareh;C. O’Sullivan;T. Nagira;H. Yasuda;C. Gourlay