【摘要】 从共晶点、混合热、原子尺寸差和微合金化出发,设计了Ni-Zr-Ti-Nb体系具有较高玻璃形成能力的Ni基合金成分,用铜模吸铸法制备了直径2mm的块体非晶合金,用X射线衍射仪、差热扫描量热仪和振动样品磁强计检测了样品的组织结构、热稳定性和磁学性。结果表明:微量Sn的添加提高了合金的玻璃形成能力,制备出了准2mm的棒状完全非晶试样;Bi不利于提高Ni-Zr-Ti-Nb体系合金的玻璃形成能力。此外,微量Sn能使饱和磁感应强度稍有提高。更多还原

【Abstract】 From the aspects of eutectic point,heat of mixing,atomic size difference and micro-alloying,Ni-Zr-Ti-Nb-M(M=Sn,Bi)alloys with high glass forming ability were designed.Bulk metallic glassy rods with the diameter of 2 mm were obtained by copper-mold vacuum suction casting.The microstructure,thermal stability and magnetic were observed by X-ray diffraction,differential scanning calorimetry and vibrating sample magnetometer,respectively,The results show that the micro-alloy element Sn can improve the glass forming ability(GFA) of Ni-Zr-Ti-Nb BMG system.Adding small amount of Bi is not beneficial for the GFA of the alloy system.The addition of Sn can slightly enhance the saturation magnetization(Ms) of the alloy system.更多还原