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第二相對Mg-Ca-Sn鎂合金鑄態(tài)組織和力學性能的影響
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國家自然科學基金（51171212）；國家科技支撐計劃“十二五”項目（2011BAE22B03-3，2013DFA71070）；重慶市科委資助項目（CSTC2010AA4048，CSTC2012JJJQ50001，CSTC2012GGB50003）


Effect of Second Phases on Microstructure and Mechanical Properties of As-Cast Mg-Ca-Sn Magnesium Alloy
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    摘要:

    研究了含有不同第二相的金屬型鑄造Mg-Ca-Sn鎂合金的顯微組織和力學性能。結(jié)果表明：在合金中Ca和Sn單獨存在可以在一定程度抑制鑄態(tài)基體晶粒長大，Mg2Ca在晶界或枝晶界處連續(xù)分布，Mg2Sn呈顆粒狀在晶界和晶內(nèi)分布。Ca和Sn同時存在時，有CaMgSn在基體上呈半連續(xù)的點狀或針狀，在凝固過程中可作為α-Mg的異質(zhì)形核核心，與單獨添加相比，鎂基體的鑄態(tài)晶粒尺寸顯著細化。運用邊-邊匹配模型分析了CaMgSn化合物與α-Mg之間的異質(zhì)形核晶體學關(guān)系。晶粒細化后的Mg-Ca-Sn鎂合金的顯微硬度得到明顯提高。

    Abstract:

    The effects of second phases on microstructure and mechanical properties of as-cast Mg-Ca-Sn permanent moulding magnesium alloy were investigated. The results indicate that sole addition of Ca and Sn refined grain size of as-cast magnesium alloy in a certain degree. Mg2Ca phase precipitated at grain boundaries continuously and granular Mg2Sn phase existed at grain boundaries and inside the grains. Point and needle-like CaMgSn phase can be formed after Ca and Sn combined addition. Because CaMgSn particles acted as heterogeneous nucleus of α-Mg during solidification, the grain of α-Mg was significantly refiner than sole addition one. The edge-to-edge matching model was used to analyze the crystallography mismatch relationship between CaMgSn and α-Mg. Microhardness of Mg-Ca-Sn magnesium alloy was improved remarkably with finer grain size.

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蔣 斌,周冠瑜,戴甲洪,夏祥生,萬元元,潘復(fù)生.第二相對Mg-Ca-Sn鎂合金鑄態(tài)組織和力學性能的影響[J].稀有金屬材料與工程,2014,43(10):2445~2449.[Jiang Bin, Zhou Guanyu, Dai Jiahong, Xia Xiangsheng, Wan Yuanyuan, Pan Fusheng. Effect of Second Phases on Microstructure and Mechanical Properties of As-Cast Mg-Ca-Sn Magnesium Alloy[J]. Rare Metal Materials and Engineering,2014,43(10):2445~2449.]
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  • 收稿日期:2013-10-29
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  • 在線發(fā)布日期: 2015-04-07
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