加压退火对Gd₃₆La₂₀Al₂₄Co₂₀块体非晶合金晶化行为和热稳定性的影响

来源期刊：金属学报2011年第4期

论文作者：刘彤 朱亚蓉 张同文 张涛

文章页码：502 - 506

关键词：非晶合金； 加压退火； 晶化行为； 热稳定性

Key words：bulk metallic glass； preannealing under pressure； crystallization behavior； thermal stability

摘    要：用铜模铸造法制备了Gd₃₆La₂₀Al₂₄Co₂₀块体非晶合金,并在其过冷液相区内不同温度及不同压力下进行了加压退火处理.通过XRD和DSC研究了加压退火处理对该非晶合金晶化行为及热稳定性的影响规律.结果表明,加压退火抑制了Gd₃₆La₂₀Al₂₄Co₂₀非晶合金的晶化过程,其晶化激活能E随退火压力的增加而增大,分析了相关的机理.

Abstract: Gd₃₆La₂₀Al₂₄Co₂₀ bulk metallic glass (BMG) was prepared by copper-mold casting. The crystallization behavior and thermal stability of Gd₃₆La₂₀Al₂₄Co₂₀ during annealing under two temperatures in supercooled liquid region and the pressures ranging from ambient pressure to 725 MPa were investigated by XRD and DSC.High pressure was found to retard the crystallization of Gd₃₆La₂₀Al₂₄Co₂₀ BMGs.The apparent activation energy of the crystallization,E,determined by Kissinger equation increases with increasing applied pressure.The relative mechanisms were analyzed appropriately.