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采用铜模法制备了Ti35Zr30Be27.5-xCu7.5Cox(x=3.5,7.5,11.5,摩尔分数)系列块体非晶合金,并采用差示扫描量热仪(DSC)和X射线分析(XRD)研究了不同Co含量对其热稳定性的影响。结果表明,随着加热速度的提高,3种非晶合金的玻璃转变温度、晶化开始温度和峰值温度均向高温区移动,说明该系列合金的玻璃转变和晶化均为动力学过程。用Kissinger方法计算出的玻璃转变激活能(Eg)以及晶化激活能(Ex)分别随着Co含量的增加而增大,当Co含量为11.5%时,其E和E分别为207.8kJ/mol和238.1kJ/mol。
A series of bulk amorphous alloys Ti35Zr30Be27.5-xCu7.5Cox (x = 3.5, 7.5, 11.5, mole fraction) were prepared by copper mold method and characterized by differential scanning calorimeter (DSC) and X-ray diffraction (XRD) The effects of different Co contents on their thermal stability were investigated. The results show that with the increase of heating rate, the glass transition temperature, crystallization start temperature and peak temperature of the three kinds of amorphous alloys all move toward the high temperature region, indicating that the glass transition and crystallization of these alloys are all kinetic processes. The glass transition activation energy (Eg) and crystallization activation energy (Ex) calculated by Kissinger method increase with the increase of Co content, respectively. The E and E values of Co at 11.5% are 207.8 kJ / mol And 238.1 kJ / mol.