摘要
利用不同锆原材料、采用电弧炉坩埚倾斜铸造法制备了具有不同氧含量的Zr50Cu40Al10三元锆基块体金属玻璃,研究了氧对合金热稳定性及晶化动力学的影响.研究结果表明:合金的热稳定性随其氧含量的增加而降低,但晶化表观激活能却随氧含量的增加而增加;氧是通过提高晶化反应速率常数而降低合金热稳定性的,热稳定性与反应速率常数之间存在良好的对应关系,反应速率常数可以较好地表征具有强烈动力学效应的块体金属玻璃晶化过程;氧提高合金晶化反应速率常数的原因是由于它增大了反应的频率因子.
Ternary Zr50Cu40Al10 bulk metallic glass （BMG） with different oxygen contents was fabricated by tilt casting method adopting ladle hearth-type arc furnace for different raw zirconium materials. The effects of oxygen on the thermal stability and the crystallization kinetics of the ternary alloy were investigated. It is shown that the thermal stability of the alloy is seriously decreased and the crystallization apparent activation energy clearly increased with increasing oxygen concentration during this process. Oxygen reduces the thermal stability of the alloy by raising the crystallization reaction constant. An expected corresponding relationship between the thermal stability of the alloy and the crystallization reaction constant is demonstrated. Crystallization reaction constant perfectly characterizes BMG crystallization process with a strong kinetic effect.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2005年第11期1223-1226,共4页
Journal of Xi'an Jiaotong University
关键词
块体金属玻璃
热稳定性
激活能
晶化反应
bulk metallic glass
thermal stability
activation energy
crystallization reaction
