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首页> 外文会议>International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials(ISMANAM 2004); 20040822-26; Sendai(JP) >Depression of the peritectic melting point of FeSn_2 in FeSn_2-FeSn nanocomposites produced by mechanical milling
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Depression of the peritectic melting point of FeSn_2 in FeSn_2-FeSn nanocomposites produced by mechanical milling

机译：机械研磨制备的FeSn_2-FeSn纳米复合材料中FeSn_2包晶熔点的降低

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摘要

The particle size effect on the peritectic melting of FeSn_2 particles in FeSn-FeSn_2 nanocomposites was studied using differential scanning calorimetry (DSC) and X-ray diffraction (XRD). FeSn - 10 wt.% FeSn_2 compounds mechanically milled for 30 min exhibit in DSC curves a considerable decrease in the incongruent melting point from an equilibrium value of 786 K to approximately 680 K. Although FeSn_2 grains grow from 10 to 40 nm upon heating in DSC before peritectic melting sets in, the melting temperature is reduced substantially. Small latent heat during peritectic melting and large interfacial energy of FeSn-FeSn_2 nanocomposites are held responsible for the large particle size effect on incongruent melting. For rapid local heating under ball collisions during MM grain growth is hardly possible and therefore, a reduction in the peritectic melting temperature should be even substantially larger. Therefore, it can be concluded that local incongruent melting under ball collisions is the mechanism which underlies the mechanically driven decomposition of intermetallics.
机译：利用差示扫描量热法（DSC）和X射线衍射（XRD）研究了粒径对FeSn-FeSn_2纳米复合物中FeSn_2颗粒包晶熔体的影响。机械研磨30分钟的FeSn-10 wt。％FeSn_2化合物在DSC曲线中显示出不一致的熔点从平衡值786 K显着降低到大约680K。尽管在DSC中加热，FeSn_2晶粒从10 nm增长到40 nm。在包晶熔体开始凝固之前，熔化温度会大大降低。 FeSn-FeSn_2纳米复合材料的包晶熔体熔化时潜热较小，界面能较大，这对不均匀熔化具有较大的粒径效应。对于在MM碰撞期间球碰撞下的快速局部加热来说，晶粒的生长几乎是不可能的，因此，包晶熔体温度的降低甚至应该更大。因此，可以得出结论，在球碰撞下局部不一致的熔化是金属间化合物的机械驱动分解的基础。

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