Cu-based bulk metallic glasses designed by stability evaluations of liquid and amorphous phases
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 (AG) of liquid phase, which can be calculated approximately using mixing enthalpy (△Hmix) and configuration entropy (Sconfig), was taken as a stability criterion of liquid phase. On the other hand, vacancy formation energy (△Hh) was used to evaluate the stability of amorphous phase due to the linear relationship between △Hh and crystallization temperature (Tx). 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 Cu60.5Zr34Nd5.5 can be cast into amorphous alloys with 2 mm in diameter.
metallic glasses glass forming ability vacancy formation energy composition design
JI Xiu-lin PAN Ye ZHAO Jian-hua LIN Ping-hua
Engineering Research Center of Dredging Technology of Ministry of Education,Hohai University, Changz School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
国际会议
2009 Frontier Symposium of China Postductors on Materrials Science(2009年中国博士后材料科学前言论坛)
长沙
英文
630-633
2009-11-22（万方平台首次上网日期，不代表论文的发表时间）