【摘要】 采用铜模吸铸法制备Φ2mm的Fe₆₁Co₁₀Zr₅W₄B₂₀块体非晶合金,采用XRD、SEM、DSC、硬度和压缩实验研究了非晶合金的结构组织、热稳定性、晶化特征、硬度和压缩性能。该块体非晶合金表现出二级晶化,其玻璃转变温度为561.1℃,晶化温度为619.0℃,第一晶化峰温度为632.6℃,第二晶化峰比之高约117℃;用Kissinger和Ozawa方法获得的玻璃转变激活能分别为595.1kJ/mol,578.7kJ/mol,晶化激活能分别为413.9kJ/mol,407.4kJ/mol;非晶合金的晶化行为比其玻璃转变表现出更为明显的动力学效应;非晶合金的显微硬度为1207HV,压缩强度为1707.6MPa,呈典型的脆性断裂,断口中光滑区与脉状花纹区并存。更多还原

【Abstract】 Bulk amorphous alloy Fe₆₁Co₁₀Zr₅W₄B₂₀ rod with a diameter of 2mm was prepared by using copper mould suction cast.The structure,thermal stability,crystallization behavior,micro-hardness,compression properties and fracture features of this bulk metallic glass have been investigated by XRD,SEM,DSC,micro-hardness and compression tests.Amorphous alloy Fe₆₁Co₁₀Zr₅W₄B₂₀ exhibits two-stage crystallization.The glass transition temperature is about 561.6℃,onset temperature of crystallization is about 619.0℃.The first crystallization-peak temperature is about 632.6℃,and the second peak temperature is higher by about 117℃.The activation energy for glass transition derived from Kissinger and Ozawa equations is about 595.1kJ/mol and 578.7kJ/mol,and the activation energy of crystallization is about 413.9kJ/mol and 407.4kJ/mol,respectively.In the bulk amorphous alloy,both the crystallization behavior and glass transition show obvious dynamic effects,and the former is much more apparent than the latter.This amorphous alloy shows a microhardness of 1207HV and a compressive strength of 1707.6MPa. displaying a brittle fracture feature.The vein-like zone and smooth zone on the fracture surface is observed.更多还原