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鎂合金鑄軋過程中表面點狀偏析形成機制
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江蘇省自然科學(xué)基金面上項目（BK2010249）；蘇州市科技支撐計劃（SG201227）；中色科技股份公司科技發(fā)展基金項目（2008YK02）


Formation of Surface Bleeding Segregations during Twin-Roll Casting of Magnesium Alloys
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    摘要:

    采用金相檢測與掃描電鏡觀察等方法，分析了鎂合金鑄軋板坯表面點狀偏析的微觀組織與微區(qū)成分，結(jié)果表明：表面點狀偏析由富含Al、Zn溶質(zhì)元素的金屬間化合物組成，而Mn元素在偏析區(qū)域內(nèi)含量與基體相同；偏析區(qū)域內(nèi)組織主要為細小等軸晶粒。采用快速停車的方式獲取鎂合金鑄軋板坯急停試樣，分析鎂合金鑄軋板坯表面點狀偏析的形成過程；在此基礎(chǔ)上，分析了溶質(zhì)Al、Zn和Mn元素在偏析區(qū)域內(nèi)分布特征

    Abstract:

    Microstructure and micro-area chemical composition of surface bleeding segregations of magnesium alloy strips processed via twin-roll casting were investigated by OM, SEM and WDS. The results indicate that surface bleeds are composed of solute-rich intermetalics of Al and Zn element, the percentage composition of Mn element in surface bleeds is similar to that of the matrix alloy. The structure of surface bleeds changes into equiaxed grain with fine grain size. Stop-samples were achieved by abruptly interrupting casting for analyzing the solidification and deformation characters in the set-back of magnesium alloys strips, and the formation mechanism of surface bleeds were discussed. Furthermore, the characteristics of solute elements distribution in surface bleedings including Al, Zn and Mn elements were discussed

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翁文憑,鄧 康,任忠鳴,遲之東,陳 琦.鎂合金鑄軋過程中表面點狀偏析形成機制[J].稀有金屬材料與工程,2013,42(10):2093~2096.[Weng Wenping, Deng Kang, Ren Zhongming, Chi Zhidong, Chen Qi. Formation of Surface Bleeding Segregations during Twin-Roll Casting of Magnesium Alloys[J]. Rare Metal Materials and Engineering,2013,42(10):2093~2096.]
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  • 收稿日期:2012-10-12
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