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微量Y、Er元素對(duì)AZ91鎂合金微觀組織及力學(xué)性能的影響
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山東自然科學(xué)基金（Y2007F69）；山東省杰出青年科學(xué)家基金（2008BS04018）


Effects of Y and Er Addition on Microstructure and Mechanical Properties of As-Cast AZ91 Alloy
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    摘要:

    利用SEM、XRD和EDS等手段研究了單獨(dú)和復(fù)合添加微量Y、Er元素對(duì)AZ91鎂合金微觀組織的影響，并測(cè)試分析了合金的室溫及高溫力學(xué)性能。結(jié)果表明：?jiǎn)为?dú)和復(fù)合添加適量的Y、Er元素對(duì)AZ91鎂合金微觀組織都有一定程度的細(xì)化作用，連續(xù)網(wǎng)狀分布的β-Mg17Al12相減少，復(fù)合添加對(duì)晶粒細(xì)化效果更為明顯；單加Y和單加Er元素時(shí)，分別會(huì)有顆粒狀A(yù)l2Y和桿狀A(yù)l3Er化合物生成；復(fù)合添加時(shí)，顆粒狀A(yù)l2Y中的部分Y和桿狀A(yù)l3Er中的部分Er分別會(huì)被Er和Y所置換。相對(duì)于單獨(dú)添加，復(fù)合添加對(duì)合金的綜合力學(xué)性能的影響更為明顯，隨著復(fù)合添加量的增多，合金試樣的抗拉強(qiáng)度和延伸率都呈現(xiàn)先增大后減小的趨勢(shì)。

    Abstract:

    The microstructures of AZ91 alloy modified by yttrium and/or erbium addition were investigated by SEM, XRD and EDS. The mechanical properties of the alloys at room temperature and 150 °C were analyzed. The results show that adding Y and/or Er can sufficiently refine α-Mg grain and decrease the amount of continuous net-like β-Mg17Al12 phase. The refining effect of co-addition is more obvious than that of Y or Er addition alone. Y-Er co-addition is more efficient in improving crystal with smaller size and better mechanical properties. Part of Y in Al2Y or Er in Al3Er is substituted by Er or Y when Y and Er are co-added in AZ91 alloy. The alloy with Y-Er co-addition has better mechanical properties than that with Y or Er addition alone. With increases of RE, the tensile strength and elongation of alloys rise at first and then drop.

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劉 騰,滕新營(yíng),周國(guó)榮,劉立艷.微量Y、Er元素對(duì)AZ91鎂合金微觀組織及力學(xué)性能的影響[J].稀有金屬材料與工程,2012,41(11):1940~1944.[Liu Teng, Teng Xinying, Zhou Guorong, Liu Liyan. Effects of Y and Er Addition on Microstructure and Mechanical Properties of As-Cast AZ91 Alloy[J]. Rare Metal Materials and Engineering,2012,41(11):1940~1944.]
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  • 收稿日期:2011-11-30
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