Phase composition and mechanical properties of Al-1.5%Cu-1.5% Mn-0.35%Zr(Fe,Si) wire alloy
Phase composition and mechanical properties of Al-1.5%Cu-1.5% Mn-0.35%Zr(Fe,Si) wire alloy
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DOI：
10.1016/j.jallcom.2018.12.240
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发表时间：
2019-04-25
影响因子：
6.2
通讯作者：
Pesin, Alexander M.
中科院分区：
文献类型：
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作者：
Belov, Nikolay A.;Korotkova, Natalia O.;Pesin, Alexander M.
通过实验研究和Thermo-Calc软件模拟，确定了含1.5%Cu、1.5%Mn、0.35%Zr(不需要添加Sc)、Fe和Si含量分别为0.5%和0.2%的模型合金的化学成分。结果表明，在非平衡凝固过程中，模型合金铸态组织中Al2Cu和Al-15(Fe，Mn)(3)Si-2相的共晶夹杂物数量最少，而所有的锆量和约1.1%的Mn和0.8%的Cu都溶解在铝固溶体中。这种结构提供了高塑性，允许钢锭变形，而不需要进行初步的均质化。采用径向剪切轧制(RSR)的方法，以钢锭为原料生产了9 mm线材。该棒材的塑性足以满足高变形度的冷变形(轧制和拉拔)。特别是通过冷拔获得了直径分别为1 mm和0.5 mm、UTS值分别为430 Mpa和590 Mpa的线材。拉拔后的退火降低了获得的线材的强度性能并提高了延展性。对退火后线材的EBSD分析表明，所述力学性能的变化与再结晶组织的形成有关(即使在大量含Zr和Mn的弥散体存在的情况下也是如此)。因此，以实验模型合金为例，说明了获得具有足够高的力学性能的线材的基本可能性，而不需要进行均匀化处理、固溶处理和水淬火。(C)2018爱思唯尔B.V.保留所有权利。
By using the experimental study and Thermo-Calc software simulation, the chemical composition of the model alloy containing 1.5% Cu, 1.5% Mn, 0.35% Zr (without the necessity of Sc addition) and with allowable Fe and Si content of up to 0.5% and 0.2%, respectively, have been justified. It was shown that the as-cast structure of the model alloy had the minimum quantity of eutectic inclusions of the Al2Cu and Al-15(Fe,Mn)(3)Si-2 phases formed during nonequilibrium solidification, whereas all zirconium content and about 1.1% Mn and 0.8% Cu were dissolved in the aluminium solid solution. Such structure provides high plasticity that allows for the deformation of ingots without their preliminary homogenization. By using the methods of radial-shear rolling (RSR), the 9 mm wire rods were produced from the ingot. The ductility of the rod was sufficient for cold deformation (rolling and drawing) with a high degree of deformation. In particular, a wire with diameters of 1 mm and 0.5 mm, and with UTS value of 430 MPa and 590 MPa, respectively, was obtained by cold drawing. Annealing after drawing reduces the strength properties and improves ductility of the obtained wire. EBSD analysis of the wire after annealing revealed that the described changes in mechanical properties are associated with the formation of a recrystallized grain structure (even in the presence of Zr and Mn-containing dispersoids in a large amount). Thus, using the example of the experimental model alloy, the principal possibility of obtaining a wire with a sufficiently high set of mechanical properties without the necessity of homogenization annealing, solution treatment, and water quenching has been shown. (C) 2018 Elsevier B.V. All rights reserved.