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
基于EET(Empirical Electron Theory of Solids and Molecules)理论计算了Zr-Al-Ni-Cu非晶合金晶化初期可能析出的面心立方F-A_(2)B型晶化相的价电子结构,用最强键键合力n_(1)和结构单元总成键能力F分析了晶化相结构的稳定性。采用铜模...基于EET(Empirical Electron Theory of Solids and Molecules)理论计算了Zr-Al-Ni-Cu非晶合金晶化初期可能析出的面心立方F-A_(2)B型晶化相的价电子结构,用最强键键合力n_(1)和结构单元总成键能力F分析了晶化相结构的稳定性。采用铜模吸铸法制备了Zr_(55)Al_(10)Ni_(5)Cu_(30)非晶合金,使用差示扫描量热分析法和X射线衍射法研究了Zr_(55)Al_(10)Ni_(5)Cu_(30)非晶合金的晶化过程及析出的晶化相。研究表明,Zr_(55)Al_(10)Ni_(5)Cu_(30)非晶合金在763 K等温退火,晶化初期形成了F-Zr_(2)Ni晶化相。F-Zr_(2)Ni最强共价键的n_(1)值分别比F-Zr_(2)Al、F-Zr_(2)Cu的高85.76%、29.59%,F-Zr_(2)Ni的总成键能力F分别比F-Zr_(2)Al、F-Zr_(2)Cu的高98.99%、9.96%;从晶化相的稳定性及其组成原子间最强键键合力看,Zr_(55)Al_(10)Ni_(5)Cu_(30)非晶合金晶化初期只能形成F-Zr_(2)Ni晶化相。Zr-Al-Ni-Cu非晶合金晶化初期晶化相类型取决于合金成分和晶化相稳定性及其组成原子间的键合力。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.
文摘基于EET(Empirical Electron Theory of Solids and Molecules)理论计算了Zr-Al-Ni-Cu非晶合金晶化初期可能析出的面心立方F-A_(2)B型晶化相的价电子结构,用最强键键合力n_(1)和结构单元总成键能力F分析了晶化相结构的稳定性。采用铜模吸铸法制备了Zr_(55)Al_(10)Ni_(5)Cu_(30)非晶合金,使用差示扫描量热分析法和X射线衍射法研究了Zr_(55)Al_(10)Ni_(5)Cu_(30)非晶合金的晶化过程及析出的晶化相。研究表明,Zr_(55)Al_(10)Ni_(5)Cu_(30)非晶合金在763 K等温退火,晶化初期形成了F-Zr_(2)Ni晶化相。F-Zr_(2)Ni最强共价键的n_(1)值分别比F-Zr_(2)Al、F-Zr_(2)Cu的高85.76%、29.59%,F-Zr_(2)Ni的总成键能力F分别比F-Zr_(2)Al、F-Zr_(2)Cu的高98.99%、9.96%;从晶化相的稳定性及其组成原子间最强键键合力看,Zr_(55)Al_(10)Ni_(5)Cu_(30)非晶合金晶化初期只能形成F-Zr_(2)Ni晶化相。Zr-Al-Ni-Cu非晶合金晶化初期晶化相类型取决于合金成分和晶化相稳定性及其组成原子间的键合力。
