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微量釩對AZ91D鎂合金顯微組織的影響
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凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室(西北工業(yè)大學(xué))自主研究課題資助(29-TP-2009)


Effect of Trace Vanadium on Microstructure of AZ91D Magnesium Alloy
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    摘要:

    研究了添加微量釩對AZ91D鎂合金顯微組織的影響。在AZ91D鎂合金熔煉過程加入AlV55中間合金引入釩元素，用光學(xué)顯微鏡、掃描電鏡、能譜儀和X射線衍射等分析研究了加釩前后合金組織的變化以及釩在合金中的存在形式。結(jié)果表明：釩的引入使β-Mg17Al12相由不連續(xù)網(wǎng)狀逐漸離散化，釩在AZ91D合金中主要以新相Al3V形式溶解或分散于β-Mg17Al12相和α-Mg基體中。高熔點(diǎn)的新相Al3V在AZ91D鎂合金凝固過程中先于其他相生成聚集在固液界面前沿，抑制晶粒的長大；同時由于α-Mg相細(xì)化而使晶界面積增加，相應(yīng)的單位面積晶界處發(fā)生共晶反應(yīng)的熔液體積減少，生成的β-Mg17Al12相變得細(xì)小。同時由于晶粒尺寸減小以及晶界處Al3V相的強(qiáng)化作用，AZ91D合金的硬度隨著添加釩含量的增加呈增大趨勢

    Abstract:

    The effect of trace vanadium addition on the microstructure of AZ91D magnesium alloy was investigated. Vanadium was introduced by adding AlV55 master alloy. The microstructure variations before and after vanadium addition and the existence form of vanadium in the alloy were analyzed by OM, SEM, EDS and XRD. The results show that the discontinuously reticulated β-Mg17Al12 phase in magnesium alloy become gradually discrete due to vanadium addition. Vanadium added in AZ91D alloy presents in the form of Al3V phase dissolving or dispersing in the β-Mg17Al12 and α-Mg phase. The mechanism of the microstructure refinement is that Al3V phase, which has a higher melting point, has formed prior to the other phases, gathering on the solid-liquid interface and inhibiting the growth of the grain during the solidification of AZ91D alloy. The increase of the grain boundary area reduces the melt volume of eutectic reaction, resulting in the refinement of β-Mg17Al12 phase. Due to the grain refinement and strengthening of Al3V phase, the brinell hardness of AZ91D alloy increases with the V content increasing

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張 超,劉建睿,黃衛(wèi)東.微量釩對AZ91D鎂合金顯微組織的影響[J].稀有金屬材料與工程,2011,40(7):1173~1177.[Zhang Chao, Liu Jianrui, Huang Weidong. Effect of Trace Vanadium on Microstructure of AZ91D Magnesium Alloy[J]. Rare Metal Materials and Engineering,2011,40(7):1173~1177.]
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  • 收稿日期:2010-07-11
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