Cu-based bulk metallic glasses designed by stability evaluations ofliquid and amorphous phases

来源期刊：中国有色金属学报(英文版)2009年增刊第3期

论文作者：纪秀林 潘冶 赵建华 林萍华

文章页码：630 - 633

Key words：metallic glasses; glass forming ability; vacancy formation energy; composition design

Abstract: From the point of translation from liquid to amorphous phase, a new approach for composition design of bulk metallic glasses (BMGs) was suggested based on the stability estimations of liquid and amorphous phases. Gibbs free energy (ΔG) of liquid phase, which can be calculated approximately using mixing enthalpy (ΔH^mix) and configuration entropy (S_config), was taken as a stability criterion of liquid phase. On the other hand, vacancy formation energy (ΔH_h) was used to evaluate the stability of amorphous phase due to the linear relationship between ΔH_h and crystallization temperature (T_x). Based on these two sides, new Cu-Zr-Nd bulk metallic glasses were designed and synthesized successfully by suction-casting into copper mold. Experimental results about glass-forming ability are consistent with the computational values, which not only proves the validity of the new approach for composition design but also shows the new BMG of Cu_60.5Zr₃₄Nd_5.5 can be cast into amorphous alloys with 2 mm in diameter. 附件:20-p0630

基金信息：Scientific Research Starting Foundation for Doctors in Hohai University, China