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二元β-FeSi2相是一种重要的窄带半导体型金属硅化物,研究了基于该二元相的三元合金的形成规律,以丰富其材料范围.首先,利用团簇线判据作为理论依据,选取一个团簇和一个连接原子构成的模型,添加不同的第三组元作为连接原子,设计了Fe3Si8M(M=B,Cr,Ni,Cu,Co,Al)系列合金成分,即用添加组元替代二元相中的Fe连接原子.然后,用真空吸铸和真空甩带方法制备合金棒以及薄带,以获得无成分偏析的均匀合金.微结构及成分分析显示β相可以溶入摩尔含量为15%—20%的Ni,4%—13%的Cu,7%—10%的Co以及7%—10%的Cr.添加的Al取代了化学式中Si的位置,在该模型下制备β相物质添加Al是不可行的.在薄带试样Fe3Si8B和Fe3Si8Cr中有微量的非晶颗粒,表明在急冷条件下B和Cr的添加有利非晶的形成.
Binary β-FeSi2 phase is an important narrow-band semiconductor-type metal silicide, and the formation of ternary alloy based on the binary phase is studied to enrich its material range.Firstly, using the criterion of cluster line as the theoretical basis , A cluster consisting of a cluster and a connected atom is selected and different third elements are added as connecting atoms to design a series of alloy compositions of Fe3Si8M (M = B, Cr, Ni, Cu, Co, Al) Element was used to replace the Fe-connected atoms in the binary phase.After that, the alloy rods and ribbons were prepared by vacuum suction casting and vacuum striping to obtain uniform alloy without segregation of components.Microstructure and composition analysis showed that β phase can dissolve into mole Ni in an amount of 15-20%, Cu in a range of 4-13%, Co in a range of 7-10%, and Cr in a range of 7-10%. The added Al replaces the position of Si in the chemical formula and is prepared under this model It is not feasible to add Al to the β-phase material.The trace amounts of amorphous particles in the Fe3Si8B and Fe3Si8Cr ribbons indicate that the addition of B and Cr favors amorphous formation under quench conditions.