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Effect of Electromagnetic Field on the Micromorphology of Twin-roll Cast 7075 Alloy
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Effect of Electromagnetic Field on the Micromorphology of Twin-roll Cast 7075 Alloy
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Leading Group Office of Guangdong-Hong Kong Bidding for Key areas of Critical Breakthroughs (2009Z025)

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    摘要:

    利用電磁場的影響，生產(chǎn)鑄軋合金板材，主要通過光學(xué)顯微鏡對(duì)7075合金的微觀形貌和晶體尺寸進(jìn)行研究。結(jié)果表明，同傳統(tǒng)鑄軋板材方式相比，670 ℃下交變振蕩電磁場鑄軋7075板材的枝晶嚴(yán)重被破壞，拉伸，細(xì)化和等軸化。同時(shí)，在靜磁場條件下的鑄板微觀組織一定程度上細(xì)化和被拉伸，實(shí)驗(yàn)條件為勵(lì)磁電流100 A。中心偏析帶在直流磁場和交變振蕩磁場條件下明顯減輕，然而后者的影響效果更為突出。在表面和橫截面處，7075板材硬度依次隨著傳統(tǒng)鑄軋、靜磁場鑄軋和交變振蕩磁場鑄軋順序增加。隨著電磁強(qiáng)度增加，板材的強(qiáng)度和性能得到進(jìn)一步改善。無論板材何處，升高溫度都會(huì)使電磁場作用效果提高。

    Abstract:

    The micromorphology and the grain size of 7075 Al alloys were investigated by optical microscopy (OM). The rolled sheets were fabricated by electromagnetic field. It is found that the dendritic crystal of 7075 alloy sheet by alternating oscillating twin-roll cast (TRC) is severely broken, stretched, refined and equiaxed under the condition of pouring temperature 670 °C, compared with that of traditional TRC sheets. Meanwhile, the microstructures of the rolled sheets by static magnetic field (MF) process are also refined and stretched to some degrees with exciting current of 100 A. Segregation bands in center of TRC sheets are dramatically alleviated under the conditions of DC magnetic field and alternating oscillation field, while the influence of alternating oscillation TRC process is much more powerful. Hardness of 7075 sheets both on transverse and surfaces increases in turn along with traditional, static MF and alternating oscillation TRC. With increasing of electromagnetic intensity, the hardness and the properties of sheets are further improved. No matter wherever in the sheets, the influence of electromagnetic field will be further improved by elevated temperature.

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蘇 鑫,李孟男,張愛平,肖 堯,許光明. Effect of Electromagnetic Field on the Micromorphology of Twin-roll Cast 7075 Alloy[J].稀有金屬材料與工程,2014,43(10):2354~2358.[Su Xin, Li Mengnan, Zhang Aiping, Xiao Yao, Xu Guangming. Effect of Electromagnetic Field on the Micromorphology of Twin-roll Cast 7075 Alloy[J]. Rare Metal Materials and Engineering,2014,43(10):2354~2358.]
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  • 收稿日期:2013-10-25
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  • 在線發(fā)布日期: 2015-04-07
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