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本工作用X射线粉末照相法和差热分析法测定了Dy-Sn二元系合金相图。Dy-Sn系存在九个金属间化合物,其中DySn2,Dy5Sn3,Dy5Sn4以及Dy11Sn10已有结构报道,其余五个化合物尚未见报道,它们是:Dy2Sn,DySn,Dy8Sn9,Dy4Sn7和DySn4存在四个共晶反应,六个包晶反应。化合物Dy2Sn,DySn,Dy4Sn7分别在1237℃,1222℃及1154℃同成份熔化,Dy5Sn3,Dy5Sn4,Dy11Sn10,Dy8Sn9,DySn2及DySn4则分别在包晶反应温度,1140℃、1160℃,1175℃,1134℃,738℃以及442℃分解,富Dy区在1182℃存在一熔晶转变。DySn4与Sn互不溶解。α-Dy中最大含Sn量大约为5wt％,β-Dy中最大含Sn量大约为7wt%。A phase diagram of the alloys of the Dy-Sn binary system has been investigated by means of X-ray diffraction method and differential thermal analysis. The intermetallic com- pounds DySn2,Dy5Sn3,Dy5Sn4 and Dy11Sn10 were detected, and the new intermetallic Compounds Dy2Sn,DySn,Dy8Sn9,Dy4Sn7 and DySn4 were observed.There are four eutectic reactions and six peritectic reactions in Dy-Sn system. Dy2Sn,DySn,Dy4Sn7 melt congruently at 1237℃, 1222℃ and 1154℃ respectively, and Dy5Sn3,Dy5Sn4,Dy11Sn10,Dy8Sn9,DySn2 and DySn4 decompose at peritectic reaction temperatures 1140℃, 1160℃, 1175℃, 1134℃, 738℃ and 442℃ respectively. There exists a Crystal melting transformation at 1182℃ in Dy-rich region.DySn4 does not show any detectable Solid solubility in Sn and Sn shows solid solubility up 5 wt% to in α-Dy and 7 wt% in β-Dy.
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