Zr-Al-Ni-Cu bulk metallic glasses （BMGs） were developed and their fragility parameters （m） were calculated by Arrhenius and Vogel-Fulcher-Tammann （VFT） equations. The results show that the m values of the Zr-Al-...Zr-Al-Ni-Cu bulk metallic glasses （BMGs） were developed and their fragility parameters （m） were calculated by Arrhenius and Vogel-Fulcher-Tammann （VFT） equations. The results show that the m values of the Zr-Al-Ni-Cu BMGs derived by Arrhenius equation are in agreement with the corresponding m values derived by VFT equation. These Zr-Al-Ni-Cu BMGs characterize in low m values. The low m values for these BMGs would be due to their network microstructures. In addition, the m values of Zr-Al-Cu-Ni BMGs could be obtained by regulating Zr content. The composition of Zr-Al-Cu-Ni BMGs with the lowest m value would be near 54%Zr （mole fraction） because the m value about 13 of Zr 54 Al 13 Cu 18 Ni 15 BMG is the lowest among these Zr-Al-Ni-Cu BMGs developed.展开更多
在两种不同的真空度下 ,运用真空电弧炉熔炼合金制备试样 ;运用X射线衍射技术和晶相显微技术对试样进行了分析和讨论。结果表明 :用真空电弧炉熔炼合金能得到比较均匀的母合金熔体 ;由于Zr Al Cu Ni合金与铜型之间的润湿角很大 ,因而形...在两种不同的真空度下 ,运用真空电弧炉熔炼合金制备试样 ;运用X射线衍射技术和晶相显微技术对试样进行了分析和讨论。结果表明 :用真空电弧炉熔炼合金能得到比较均匀的母合金熔体 ;由于Zr Al Cu Ni合金与铜型之间的润湿角很大 ,因而形成玻璃能力强 ;高真空度、原材料成分的纯度是Zr Al Cu Ni合金形成玻璃态的重要因素 ;金属合金熔体随水冷铜型一起冷却 ,在真空度不高的条件下 ,由于合金熔体中的组元与空气中的氧、氢及氮反应形成晶核 ,而合金熔体与铜型之间的温度梯度不大 ,无法抑制晶核的生长 。展开更多
基金Project(50874045)supported by the National Natural Science Foundation of ChinaProjects(200902472,20080431021)supported by the China Postdoctoral Science FoundationProject(10A044)supported by the Research Foundation of Education Bureau of Hunan Province of China
文摘Zr-Al-Ni-Cu bulk metallic glasses （BMGs） were developed and their fragility parameters （m） were calculated by Arrhenius and Vogel-Fulcher-Tammann （VFT） equations. The results show that the m values of the Zr-Al-Ni-Cu BMGs derived by Arrhenius equation are in agreement with the corresponding m values derived by VFT equation. These Zr-Al-Ni-Cu BMGs characterize in low m values. The low m values for these BMGs would be due to their network microstructures. In addition, the m values of Zr-Al-Cu-Ni BMGs could be obtained by regulating Zr content. The composition of Zr-Al-Cu-Ni BMGs with the lowest m value would be near 54%Zr （mole fraction） because the m value about 13 of Zr 54 Al 13 Cu 18 Ni 15 BMG is the lowest among these Zr-Al-Ni-Cu BMGs developed.
文摘在两种不同的真空度下 ,运用真空电弧炉熔炼合金制备试样 ;运用X射线衍射技术和晶相显微技术对试样进行了分析和讨论。结果表明 :用真空电弧炉熔炼合金能得到比较均匀的母合金熔体 ;由于Zr Al Cu Ni合金与铜型之间的润湿角很大 ,因而形成玻璃能力强 ;高真空度、原材料成分的纯度是Zr Al Cu Ni合金形成玻璃态的重要因素 ;金属合金熔体随水冷铜型一起冷却 ,在真空度不高的条件下 ,由于合金熔体中的组元与空气中的氧、氢及氮反应形成晶核 ,而合金熔体与铜型之间的温度梯度不大 ,无法抑制晶核的生长 。
