Effects of plastic deformation of solid phase on mechanical properties and microstructure of wrought 5A06 aluminum alloy in directly semisolid thixoforging
Effects of plastic deformation of solid phase on mechanical properties and microstructure of wrought 5A06 aluminum alloy in directly semisolid thixoforging
复制标题
直接半固态触变锻造固相塑性变形对变形5A06铝合金力学性能和显微组织的影响
DOI：
10.1016/j.jallcom.2020.154748
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发表时间：
2020-08
影响因子：
6.2
通讯作者：
Xinquan Xiao
中科院分区：
文献类型：
--
作者：
Jufu Jiang;Yingze Liu;Guanfei Xiao;Ying Wang;Xinquan Xiao
提出了一种低成本、短流程的可锻5A06合金直接触变锻造工艺来成形支架形零件。结果表明，最小壁厚为 6 毫米、拔模角仅为 1°、余量为 1 毫米的复杂部件已成功进行触变成型。坯料形状对触变锻造过程中半固态浆料的充型过程有轻微影响。触变锻造件显微组织中的实心晶粒表现出较大的变形程度。它导致触变锻造零件的机械性能明显提高。屈服强度（YS）从129.28MPa变化到149.63MPa，极限拉伸强度（UTS）从293.92MPa变化到322.3MPa，伸长率从18%变化到41.48%。 YS略高于轧制板，延伸率远高于轧制板，UTS略低于热轧板。较大的椭球晶粒引起的塑性变形程度的增加有利于提高触变锻造件的力学性能。延伸率的显着提高归因于触变锻造过程中β相（Mg5Al8）的均匀再沉淀。
A directly thixoforged technology of wrought 5A06 alloy with low-cost and short-process was proposed to form a bracket-shape component. The results showed that complex components with a minimum wall thickness of 6 mm, a draft angle of only 1° and an allowance of 1 mm were thixofored successfully. The billet’s shape had a slight influence on the filling process of the semisolid slurry during the thixforging. Solid grains in the microstructure of the thixoforged parts exhibited a large deformation degree. It led to an obvious improvement of the mechanical properties of the thixoforged parts. The yield strength (YS) varied from 129.28 MPa to 149.63 MPa, the ultimate tensile strength (UTS) varied from 293.92 MPa to 322.3 MPa, and the elongation varied from 18% to 41.48%. The YS is slightly higher than that of the rolled plate, the elongation is much higher than that of the rolled plate, and the UTS is slightly lower than that of the hot-rolled plate. The increase of plastic deformation degree caused by larger ellipsoid grains is beneficial to improve the mechanical properties of the thixoforged components. The significant improvement of elongation was attributed to homogeneous re-precipitation of the β phase (Mg5Al8) in the thixoforged process.
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