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Al4C3對AZ91D鎂合金鑄態(tài)顯微組織與性能的影響
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湖北省科技攻關(guān)項目(2007AA101C37)


Effect of Al4C3 on the As Cast Microstructure and properties of AZ91D Magnesium Alloy
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    借助SEM、EDS、XRD、DTA研究Al4C3對AZ91D鎂合金鑄態(tài)顯微組織與性能的影響。結(jié)果表明，少量Al4C3對合金鑄態(tài)組織具有明顯的細化作用，而且共晶組織形貌發(fā)生明顯改變，由完全離異的骨骼狀β相共晶組織和共生生長的層片狀共晶組織α+β轉(zhuǎn)變?yōu)榉涓C狀的部分離異共晶組織α+β，同時β相的尺寸變小、分布更趨彌散。通過能譜分析、差熱分析以及錯配度的計算，證實Al4C3可成為初生α-Mg的良好異質(zhì)核心。顯微組織的細化使強度性能明顯提高，延伸率的提高幅度有限，耐腐蝕性能改善

    Abstract:

    The effects of Al4C3 on the microstructure and performances of AZ91D alloy are studied by using SEM, EDS, EDS and DTA. It is found that a small amount Al4C3 addition to AZ91D magnesium alloy leads to the α-Mg grain size obvious decreasing, causes the eutectic microstructure morphology marked change from the fully-divorced β eutectic phase and lamellar α+β eutectic structure to honeycomb partially-divorced α+β eutectic structure, and the β-phases diminution of size and tendency to dispersed distribution. Based on the analysis of EDS, DTA and the calculation of disregistry between Al4C3 and Mg, it is found that the Al4C3 particles can act as the heterogeneous nuclei. The strength properties are significantly improved due to the microstructural refinement of AZ91D alloy, but a little change of elongation percentage, and slight increase of corrosion resistance

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劉生發(fā),王小虎,韓 輝,劉林艷,李 波,蘇 偉. Al4C3對AZ91D鎂合金鑄態(tài)顯微組織與性能的影響[J].稀有金屬材料與工程,2009,38(7):1146~1149.[Liu Shengfa, Wang Xiaohu, Han Hui, Liu Linyan, Li Bo, Su Wei. Effect of Al4C3 on the As Cast Microstructure and properties of AZ91D Magnesium Alloy[J]. Rare Metal Materials and Engineering,2009,38(7):1146~1149.]
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  • 收稿日期:2008-06-23
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