摘要
为了研究熔体冷却速率对Zr65Cu17.5Ni10Al7.5非晶合金热力学参数的影响,采用真空电弧熔炼及水冷铜模吸铸法,制备了厚度分别为1 mm、2 mm、3 mm的片状非晶合金试样,并分别用X射线衍射仪(XRD)和差示扫描量热仪(DSC)对样品的结构和热稳定性进行了表征。结果表明,随着冷却速率的降低,晶化开始温度T_x、晶化峰值温度T_p先降低再升高,而玻璃转变温度T_g却先升高再降低,导致过冷液相区Δ_T先降低再升高。1 mm和2 mm试样的表观晶化激活能(E_x和E_p)相差不大,而3 mm的表观晶化激活能略微增大;3个试样的玻璃转变激活能Eg几乎相同。
In order to investigate the effect of melt cooling rate on thermodynamic parameters of Zr65CulT.SNilOA17.5 amorphous alloy,the Zr65Cu17.SNilOA17.5 amorphous alloy slabs with thickness of 1 mm, 2 mm and 3 mm were made by vacuum arc furnace and suction casting into a water-cooled copper mold. The structure and thermodynamic parameters of samples were detected by X-ray diffraction （XRD） and differential scanning calorimeter （DSC）. With decreasing of cooling rate, the crystallization onset temperature Tx and the peak temperature Tp first decrease and then increase, but glass transition temperature Ts first increases and then decreases, then lead to supercooled liquid region AT first decreases and then increases. The crystallization activation energy （Ex and Ep） of 1 mm and 2 mm samples are similar, but these of 3 mm samples have an increasing trend. The glass transition activation energy Es of the three samples are almost the same.
出处
《铸造设备与工艺》
2016年第2期25-29,共5页
Foundry Equipment & Technology
基金
国家自然科学基金51204118和51441004
山西省高等学校青年学术带头人支持计划(2013)
山西省高等学校大学生创新创业训练项目2011243
山西省回国留学人员科研资助项目2013-094
太原科技大学研究生科技创新项目20134008
关键词
非晶合金
冷却速率
热力学参数
晶化激活能
amorphous alloy, cooling rate, thermodynamic parameters, crystallization activation energy
