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Effects of Different State Mg-5Sr-10Y Master Alloys on the Microstructure Refinement of AZ31 Magnesium Alloy
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Effects of Different State Mg-5Sr-10Y Master Alloys on the Microstructure Refinement of AZ31 Magnesium Alloy
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Foundation Item: National Basic Research Program of China (2007CB613702); International Scientific and Technological Cooperation Projects (2010DFR50010)

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    摘要:

    通過(guò)OM金相顯微鏡，SEM掃描電鏡和XRD等手段研究了不同狀態(tài)(鑄態(tài)，擠壓態(tài)，固溶態(tài))Mg-5Sr-10Y中間合金的組織及其對(duì)AZ31組織細(xì)化效果。研究結(jié)果表明：所有的Mg-5Sr-10Y中間合金均由α-Mg，Mg17Sr2 和 Mg24Y5相組成，但是α相的形貌以及第二相的尺寸，數(shù)量和形態(tài)卻各不相同，并最終導(dǎo)致對(duì)AZ31晶粒細(xì)化效果的不同；各種不同狀態(tài)的中間合金均能有效細(xì)化AZ31鎂合金，但細(xì)化效果卻不同，擠壓態(tài)中間合金對(duì)AZ31細(xì)化效果最好，其次是鑄態(tài)，最后是固溶態(tài)；不同的細(xì)化效果主要與非均質(zhì)形核和成分過(guò)冷有關(guān)，而與遺傳效應(yīng)無(wú)關(guān)

    Abstract:

    Microstructures of different state Mg-5Sr-10Y master alloys (as cast, as solutionized and as extruded) and their effects on the grain refinement of AZ31 magnesium alloy were investigated by OM, SEM and XRD. The results indicate that all the master alloys are composed of α-Mg, Mg17Sr2 and Mg24Y5 intermetallic compounds, but the morphology of the α phase and the form, the quantity and the size of the second phase are different, which lead to the different grain refinement efficiencies in AZ31 magnesium alloy. It is found that the extruded Mg-5Sr-10Y master alloy has the best grain refinement efficiency, then the as cast and solutionized in turn. The different grain refinement efficiencies of various master alloys are related to the heterogeneous nucleation and the constitutional undercooling

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彭曉東,李俊辰,謝蘇云,魏國(guó)斌,楊 艷. Effects of Different State Mg-5Sr-10Y Master Alloys on the Microstructure Refinement of AZ31 Magnesium Alloy[J].稀有金屬材料與工程,2013,42(12):2421~2426.[Peng Xiaodong, Li Junchen, Xie Sunyun, Wei Guobin, Yang Yan. Effects of Different State Mg-5Sr-10Y Master Alloys on the Microstructure Refinement of AZ31 Magnesium Alloy[J]. Rare Metal Materials and Engineering,2013,42(12):2421~2426.]
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  • 收稿日期:2012-12-30
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