摘要
通过铜模吸铸法制备(Zr47Cu44Al9)100-xMox(x=0,1,2,3)大块非晶合金.利用X射线衍射、差热分析等,研究分析添加Mo对Zr47Cu44Al9合金非晶形成能力及热稳定性的影响.结果表明,Mo的添加量为2%时,合金具有最大的非晶形成能力,纯非晶试样的临界尺寸从4mm增大到6mm以上,8mm的样品只有微弱的衍射峰.Mo提高非晶形成能力的原因主要是抑制引起异质形核的CuZr相的析出与长大.利用Kissinger方法计算得到的其玻璃转变激活能Eg为278.57kJmol-1、晶化激活能Ex为392.46kJmol-1、晶化峰值的激活能Ep为376.97kJmol-1.与原合金相比,晶化激活能与晶化峰值激活能的数据都增大,说明Mo的添加不仅提高了原合金的非晶形成能力,同时也增强了合金的热稳定性.
（Zr47Cu44Al9）100-xMox（x=0,1,2,3） metallic glass alloys were prepared by copper mould casting.The effect of Mo addition on the glass-forming ability（GFA） and thermal stability was investigated by using X-ray diffraction（XRD）,and differential scanning calorimetry（DSC）.The maximum diameter of glassy rods is increased from 4 mm for the base alloy to 6 mm for the（Zr47Cu44Al9）98Mo2 alloy without detectable crystallinity,and 8 mm sample owns very low diffraction peak.Due to suppression of the formation and growth of the primary CuZr phase,properly adding Mo enhances the GFA of the base alloy.The characteristic temperature apparent activation energy was calculated by the Kissinger equation.The activation energies of glass transition（Eg）,crystallization（Ex） and peak crystallization（Ep） are 278.57 kJ mol-1,392.46 kJ mol-1 and 376.97 kJ mol-1,respectively.Compared with the base alloy,2% Mo addition can not only improve the glass forming ability,but also increase the thermal stability.The possible mechanisms were also discussed.
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2012年第6期614-618,共5页
Scientia Sinica Physica,Mechanica & Astronomica
基金
亚稳材料制备技术与科学国家重点实验室开放基金(编号:201105)
河南省教育厅基金(编号:2011A430015)
河南理工大学博士基金(编号:B2010-81)资助项目
关键词
大块非晶合金
非晶形成能力
热稳定性
激活能
bulk metallic glass
glass forming ability
thermal stability
activation energy
