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Composition Homogenization Evolution of Twin-Roll Cast 7075 Aluminum Alloy Using Electromagnetic Field
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Composition Homogenization Evolution of Twin-Roll Cast 7075 Aluminum Alloy Using Electromagnetic Field
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Xu Guangming, Ph. D., Professor, School of Materials and Metallurgy, Northeastern University, Shenyang 110819, P. R. China, Tel: 0086-24-83681758, E-mail: Xu_GM@epm.neu.edu.cn

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    摘要:

    在利用雙輥連鑄機(jī)生產(chǎn)7075鋁合金中，會(huì)發(fā)現(xiàn)許多微觀缺陷，如粗大完整的枝晶和嚴(yán)重偏析等。利用金相和SEM測定了7075板坯組織形貌和相成分，并通過與傳統(tǒng)生產(chǎn)方式的對比，研究在鑄軋工藝中施加0.13 T大小的電磁場對溶質(zhì)成分分布的差異。就板材顯微組織大量細(xì)化和偏析帶縮小而言，最有效的方式是386 A，50 Hz工頻電流下交變振蕩電磁場鑄軋工藝。另外，晶界處存在大量t（AlZnMgCu）相，并按照直流磁場、半波振蕩磁場和交變振蕩磁場順序逐漸均勻細(xì)化。并且在振蕩電磁場下網(wǎng)狀沉淀相完全消失。

    Abstract:

    Many microstructural defects such as well-developed dendritic crystal and severe segregation have been found in 7075 aluminum alloy strips by continuous twin-roll casters. Morphology and phase composition of 7075 alloy strips were tested in this paper. Electromagnetic field of 0.13 T was applied during a twin-roll casting (TRC) process to study the difference in solute element distribution compared to conventional process. The most soundest method by which the microstructure of slabs was greatly refined and equiaxed, and segregation bands narrowed down efficiently, was an alternating oscillating process with industrial frequency current and frequency of 386 A and 50 Hz, respectively. In addition, t (AlZnMgCu) phase with high density was formed at (sub) grain boundaries, which was refined and homogenized consecutively in accordance with direct chill (DC) electromagnetic field, half-wave oscillating field and alternating oscillating field; moreover, netlike precipitates completely disappeared at oscillating TRC processes.

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蘇 鑫,劉 譚,許光明. Composition Homogenization Evolution of Twin-Roll Cast 7075 Aluminum Alloy Using Electromagnetic Field[J].稀有金屬材料與工程,2015,44(3):581~586.[Su Xin, Liu Tan, Xu Guangming. Composition Homogenization Evolution of Twin-Roll Cast 7075 Aluminum Alloy Using Electromagnetic Field[J]. Rare Metal Materials and Engineering,2015,44(3):581~586.]
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  • 收稿日期:2014-03-18
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  • 在線發(fā)布日期: 2015-05-29
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