摘要
研究了Cu50Zr42Al8大块非晶合金在连续升温过程中的晶化行为。结果表明,随升温速度的加快,玻璃转变温度Tg、晶化起始温度Tx、晶化峰值温度Tp都向高温区移动,过冷温度区△Tx扩大;运用Kissinger法分别计算出玻璃转变激活能Eg为417.19kJ/mol、晶化起始激活能Ex为332.18kJ/mol、晶化峰的激活能Ep为327.70kJ/mol;并运用FWO法计算晶化阶段激活能Ex,随晶化量的增大,阶段激活能呈逐渐减小的趋势,且在最初的阶段(晶化量小于5%),激活能迅速减小。分析表明,Cu50Zr42Al8块体非晶合金具有良好的热稳定性。
Crystallization behavior of bulk Cu50Zr42Al8 amorphous alloy during continuous temperature-increment was described.The results indicate that with increasing in the temperature,the glass transformation temperature(Tg),crystallization temperature(Tx)and crystallization peak temperature(Tp)tend towards high temperature zone,and under-cooled temperature zone △Tx is enlarged.The glass transformation activation energy Eg,crystallization initial activation energy Ex and crystallization peak activation energy Ep are calculated by the Kissinger formula which is 417.19 kJ/mol,332.18 kJ/mol and 327.70 kJ/mol,respectively.In addition,crystallization activation energy Ex is calculated by the FWO equation.It is found that the crystallization activation energy is decreased with the increase of crystallization degree,in which the activation energy is sharply declined with the crystallization degree lower than 5%.The Cu50Zr42Al8 bulk amorphous alloy exhibits desirable thermal stability.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2008年第6期420-421,共2页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(50371016)
关键词
大块非晶
晶化
激活能
Bulk Amorphous Alloy,Crystallization,Activation Energy
