【摘要】 采用铜模吸铸法制备了直径为2～3mm的圆柱状Cu60-xZr30Ti10Snx(x=0、1、2)块体非晶合金。用X射线衍射(XRD)和差式扫描量热仪(DSC)研究了非晶合金的结构、热稳定性和晶化特征,非晶合金Cu60-xZr30Ti10Snx的特征温度Tg、Tx、△Tx=(Tx-Tg)均与Sn含量相关。块体非晶合金Cu58Zr30Ti10Sn2的Tg为703.9K、Tx为755.5K、△Tx约为51.6K。这些特征温度随DSC升温速率的增大,不断向高温区偏移,其中晶化行为的这种动力学效应比其玻璃转变的更为显著。由Kissinger法获得的块体非晶合金Cu58Zr30Ti10Sn2的玻璃转变激活能Eg为3.30eV、晶化激活能Ex为3.17eV、第一晶化峰激活能Ep1为2.82eV、第二晶化峰激活能Ep2为3.13eV。由Ozawa法获得的各激活能比Kissinger法的相应数值稍偏低,但趋势是一致的。更多还原

【Abstract】 Cylindrical bulk amorphous alloy Cu 60-xZr 30Ti 10Sn_x （ x=0,1,2） with diameter of 2³ mm have been prepared by copper mould sucking casting. The structure and heat stability as well as crystallization behavior of the amorphous alloy were observed by means of XRD （X-ray diffraction） and DSC （differential scanning calorimeter）. Characteristic temperatures of the amorphous alloy Cu 60-xZr 30Ti 10Sn_x （x=0,1,2）, such as glass transition temperature T_g, crystallization temperature T_x and supercooled liquid region, are controlled by Sn content. For the Cu 58Zr 30Ti 10Sn₂ amorphous alloy, T_g and T_x, △T_x are about 703.9 K, 755.5 K and 51.6K, respectively. The characteristic temperatures are gradually tended to high temperature zones with DSC heating rate increase, where the dynamic effect of crystallization is much higher that of glass transition. The activation energies of bulk amorphous alloy Cu 58Zr 30Ti 10Sn₂ calculated using Kissinger are list as follows: the glass activation energy, E_g, about 3.30 eV, crystallization activation energy,E_x, about 3.17 eV, that for the first crystallization peak, E p1, about 2.82 eV and that for the second crystallization peak, E p2, about 3.13eV. Although the corresponding values, derived from Ozawa method, are slightly lower, it shows a similar tendency compared with ones derived from the Kissinger.更多还原