A low-density pulse-current-assisted age forming process for high-strength aluminum alloy components

A low-density pulse-current-assisted age forming process for high-strength aluminum alloy components
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高强度铝合金构件低密度脉冲电流辅助时效成形工艺

DOI:
10.1007/s00170-018-2131-6
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发表时间:
2018-05
影响因子:
3.4
通讯作者:
Li H.
Li H.
中科院分区:
工程技术3区
文献类型:
--
作者:
Xu Y. Q.;Tong C. Y.;Zhan Lihua;Liu C. H.;Tan J. S.;Huang M. H.;Yang Y. L.;Li H.

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提出了一种铝合金零件脉冲电流辅助时效成形工艺,并通过模拟和实验对该工艺进行了评价。研究了脉冲电流对2219铝合金板形件的电流密度分布、焦耳热效应、回弹、力学性能和析出相组织的影响。结果表明,在低密度脉冲电流(小于80 A/cm 2)下,电流在器件中呈中心对称分布,焦耳热效应可以忽略不计。与传统时效成形工艺相比,脉冲电流辅助时效成形工艺可以减小回弹和形状偏差。这与脉冲电流促进位错运动有关。同时,抑制了粗大θ′相的析出,使析出相分布均匀。因此,力学性能和导电性都得到了明显的提高。因此,脉冲电流辅助时效成形工艺可提高成形效率,析出组织,提高综合性能,是一种潜在的协同制造技术,可更好地控制高强铝合金构件的形状和性能。
A pulse-current-assisted age forming process of the Al alloy component is developed and evaluated by simulation and experiments. The effect of pulse-current on the electric current density distribution, Joule heat effect, springback, mechanical properties, and precipitation microstructure of a 2219 Al alloy plate component is investigated. The results show that the current distribution is centrosymmetric in the component and the Joule heat effect under the low-density pulse current (less than 80 A/cm2) can be ignored. Compared with the traditional age forming process, the pulse-current-assisted age forming process can reduce the springback and the shape deviation. This should be related to the pulse-current promotion of dislocation movement. At the same time, it restrains the coarse θ′ phase precipitation and homogenizes the precipitate distribution. Therefore, both the mechanical properties and electrical conductivity are increased evidently. Therefore, the pulse-current-assisted age forming process can improve the forming efficiency and precipitate microstructures, as well as the comprehensive performance, making it a potential cooperative manufacturing technique for better control of the shape and performance of high-strength aluminum alloy components.
整体强化 AA2219 合金板的蠕变时效成形研究:实验和建模
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发表时间: 2017-11
影响因子: 3.4
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