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Effect of Oscillating Field on Microstructure of Twin-roll Cast 7075 Aluminum Alloy
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Effect of Oscillating Field on Microstructure of Twin-roll Cast 7075 Aluminum Alloy
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Project Supported by Leading Group Office of Guangdong-Hong Kong Bidding for Key Areas of Critical Breakthroughs (2009Z025)

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    摘要:

    研究了在670 ℃下，振蕩磁場雙棍鑄軋對7075鋁合金成型板材微觀形貌和硬度影響。結果表明，同傳統(tǒng)方式鑄軋相比，采用振蕩電磁場鑄軋板材的枝晶被嚴重碎斷、細化和等軸化。在此條件下7075板材的表面及中心的偏析程度大幅減輕，并且在交變振蕩場的作用下偏析完全消失。普通鑄軋條件下板坯橫向和軋向的HV硬度值分別為1104和1356 MPa；采用電磁場后，在交變振蕩場下獲得最大硬度為1615 MPa；除此之外，當磁場強度增加，板材性能會進一步提高。另外發(fā)現(xiàn)，無論在何種磁場條件下，升高澆注溫度后，外加電磁場的細化作用效果增強。

    Abstract:

    The morphology and the hardness of 7075 Al alloy during oscillating twin-roll casting (TRC) process at 670 °C were investigated. It was observed that compared with that by traditional process, the dendritic grains of the strips by oscillation field TRC process were severely broken, refined and equiaxed. Segregation bands at the surface and the center of 7075 strips were dramatically reduced in electromagnetic oscillatory field conditions, even completely disappeared in alternating oscillatory condition. The transverse and the rolling direction HV hardness of 7075 strips manufactured by traditional process were 1104 and 1356 MPa, respectively. Upon applying the electromagnetic field, the maximum hardness of 1615 MPa was obtained in alternating oscillating TRC process. Besides, the properties of strips will be further improved with increasing of magnetic field. No matter in what conditions, the refinement of electromagnetic field to strips will increase at elevated temperature.

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蘇 鑫,張愛平,肖 堯,李孟男,許光明. Effect of Oscillating Field on Microstructure of Twin-roll Cast 7075 Aluminum Alloy[J].稀有金屬材料與工程,2014,43(12):2937~2942.[Su Xin, Zhang Aiping, Xiao Yao, Li Mengnan, Xu Guangming. Effect of Oscillating Field on Microstructure of Twin-roll Cast 7075 Aluminum Alloy[J]. Rare Metal Materials and Engineering,2014,43(12):2937~2942.]
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  • 收稿日期:2013-12-14
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  • 在線發(fā)布日期: 2015-04-16
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