Sr对Mg-5Sn-5Zn铸造镁合金组织的影响 |
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引用本文: | 邱克强,刘彬,尤俊华,任英磊.Sr对Mg-5Sn-5Zn铸造镁合金组织的影响[J].沈阳黄金学院学报,2012(1):54-57,69. |
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作者姓名: | 邱克强 刘彬 尤俊华 任英磊 |
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作者单位: | 沈阳工业大学材料科学与工程学院,沈阳110870 |
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基金项目: | 沈阳市科技攻关计划(F10-063-2-00); 辽宁省科技攻关计划(2010221005) |
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摘 要: | 通过光学显微镜、扫描电镜和X射线衍射仪研究了Mg-5Sn-5Zn-xSr(x=0,0.5,1,2)4种铸造镁合金的显微组织和相组成.结果表明:在Mg-5Sn-5Zn合金中加入质量分数为0.5%~2%的Sr元素后,不但能够缩小α-Mg枝晶间距,而且还能形成三元相MgSnSr.随着Sr含量的增加,在晶界析出的Mg2Sn相减少,晶内的MgSnSr相增加。合金中的MgZn相与Mg2Sn相依附在一起,大多数的MgZn相以α-Mg+MgZn相的共晶方式存在.
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关 键 词: | Mg合金 显微组织 Sr含量 MgSnSr相 |
Effect of strontium on the microstructure of as-cast Mg-5Sn-5Zn alloy |
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Authors: | QIU Ke-qiang LIU Bin YOU Jun-hua REN Ying-lei |
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Affiliation: | (School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China) |
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Abstract: | The microstructures and phase constituent of as-cast Mg-5Sn-5Zn-xSr(x = 0,0.5,1,2) alloys were analyzed by the optical microscopy(OM),the scanning electron microscope(SEM) and the X-ray diffraction (XRD).The results indicate that an addition of 0.5%~2%(mass fraction) Sr to the Mg-5Zn-5Sn alloy not only refines the dendrite arm spacing of α-Mg but also results in the formation of MgSnSr phases.Furthermore,it was found that the Sr increment results in the Mg2Sn phase decreases and MgSnSr phase increases.While the MgZn phase attached to the Mg2Sn phase exists in the form of α-Mg + MgZn eutectic structure. |
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Keywords: | magnesium alloy microstructure Sr addition MgSnSr phase |
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