Microstructure evolution and mechanical property improvement of aluminum alloys with high magnesium content during continuous rheo-extrusion
Microstructure evolution and mechanical property improvement of aluminum alloys with high magnesium content during continuous rheo-extrusion
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高镁铝合金连续流变挤压过程中的微观组织演变和力学性能改善
DOI：
10.1016/j.msea.2018.09.090
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发表时间：
2018-12
期刊：
影响因子：
6.4
通讯作者：
Xiaobo Chen
中科院分区：
文献类型：
--
作者：
Renguo Guan;Di Tie;Zheng Li;Yanan An;Xiang Wang;Qian Li;Xiaobo Chen
由于上级的机械性能和耐腐蚀性，具有从3至10wt%变化的高镁含量的铝合金已被广泛用作飞机焊丝和汽车材料。然而，通过传统的铸造、挤压和轧制生产线材形式的高含镁铝合金仍然具有挑战性。因此，本工作采用连续流变挤压制备高镁含量的铝合金线材，这可以消除粗枝晶的形成，从而提高力学性能。采用金相显微镜、X射线衍射仪、扫描电镜和透射电镜对合金丝的组织和性能进行了研究。结果表明，粗枝晶完全转变为等轴晶。由于连续流变挤压的冷却速度快，合金中形成了Mg固溶度高的固溶体和纳米Al 3 Mg 2相。由于固溶体原子与位错之间的相互作用，这种组织特征在拉伸试验中引起锯齿状塑性变形。随着镁含量的增加，合金的抗拉强度逐渐提高，延伸率逐渐降低。Al-5 Mg（wt%）合金丝材的抗拉强度和延伸率分别比常规铸造提高了73%和8%。
Due to superior mechanical properties and corrosion resistance, aluminum alloys with high magnesium content varying from 3 to 10 wt% have been widely used as aircraft welding wire and automotive materials. However, it remains challenging to produce high magnesium containing aluminum alloys in wire form through conventional casting, extrusion and rolling. Therefore, the present work employs continuous rheo-extrusion to manufacture Al alloy wires with high magnesium contents, which can eliminate the formation of coarse dendrites and thus improve mechanical properties. Microstructures and properties of the alloy wires were investigated by metallurgical microscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Results show that coarse dendrites were completely converted into equiaxed grains. A solid solution with high solubility of Mg and nanosized Al3Mg2phases were formed in the alloy due to the high cooling rate in continuous rheo-extrusion. Such microstructural features incurred serrated plastic deformation in tensile tests due to the interactions between the solid solution atoms and dislocations. With increasing magnesium content, ultimate tensile strength increased while the elongation decreased gradually. Ultimate tensile strength and elongation of Al-5Mg (wt%) alloy wires were improved by 73% and 8% than that of conventional casting respectively.
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影响因子：
6.3
作者：
Ch. Gras;M. W. Meredith;J. Hunt
通讯作者：
Ch. Gras;M. W. Meredith;J. Hunt
影响因子：
10.9
作者：
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通讯作者：
R. Guan;Yongfeng Shen;Zhanyong Zhao;Xiang-Jie Wang
影响因子：
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作者：
Barlow, CY;Hansen, N;Liu, YL
通讯作者：
Liu, YL
DOI：
10.1016/j.msea.2013.12.103
发表时间：
2014-03
影响因子：
6.4
作者：
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通讯作者：
M. Zha;Yanjun Li;R. Mathiesen;R. Bjørge;H. Roven
影响因子：
9.4
作者：
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通讯作者：
Ferrante, Maurizio