摘要
以Co_(28)Fe_(28)Ni_(19)Si_(13)B_(12)高熵非晶合金为研究对象,采用差示扫描量热法(DSC)、X射线衍射(XRD)和透射电镜(TEM)等检测手段,详细研究了该合金的晶化行为、热稳定性和微观结构。结果表明Co_(28)Fe_(28)Ni_(19)Si_(13)B_(12)高熵非晶合金具有良好的玻璃形成能力(GFA)和较高的热稳定性。其起始晶化激活能E_(x)小于晶化峰值激活能E_(p),表明在晶化过程中相对于晶粒形核而言,晶粒长大更困难;该合金经历了两次晶化,生成了Co_(7)Fe_(3)相和Fe-B、Ni_(74)Si_(26)相作为对应的晶化产物;在与吸热峰右侧对应的较高温度处退火后,Co_(7)Fe_(3)相消失出现新的(Ni,Fe)相,此时合金中仍存在Fe_(2)B、Ni_(13)Si_(12)和Co_(2)B相。
The crystallization behavior,thermal stability and microstructure of Co_(28)Fe_(28)Ni_(19)Si_(13)B_(12)high entropy amorphous alloy were studied by differential scanning calorimetry(DSC),X-ray diffraction(XRD)and transmission electron microscopy(TEM).The results showed that Co_(28)Fe_(28)Ni_(19)Si_(13)B_(12)high entropy amorphous alloy had good glass forming ability(GFA)and high thermal stability.The initial crystallization activation energy E_(x)was lower than the peak crystallization activation energy E_(p),indicating that the grain growth was more difficult than the grain nucleation during crystallization process.The alloy underwent two crystallization processes,the Co_(7)Fe_(3)phase and Fe-B,Ni_(74)Si_(26) phases were formed as the corresponding crystallization products.After annealing at a higher temperature corresponding to the right side of the endothermic peak,the Co_(7)Fe_(3)phase disappeared and the new(Ni,Fe)phase appeared,while Fe_(2)B,Ni_(13)Si_(12)and Co_(2)B phases still exist in the alloy.
作者
吴越
代正昆
周海涛
WU Yue;DAI Zhengkun;ZHOU Haitao(School of Material Science and Engineering,Central South University,Changsha 410000,Hunan,China)
出处
《热处理技术与装备》
2024年第2期12-17,共6页
Heat Treatment Technology and Equipment
关键词
高熵合金
非晶
晶化行为
热稳定性
微观结构
high entropy alloy
amorphous
crystallization behavior
thermal stability
microstructure
