中文摘要：

利用与团簇相关的变电子浓度判据研究了过渡金属Cu-Zr-Ti系中Cu基块体非晶合金的形成区域和成分特征．据此判据在Cu-Zr-Ti系相图中确定出三条特殊的成分线，（Cu9／13Zr4/13）100-xTix，（Cu0.618Zr0.382）100-xTix和（Cu0.56Zr0.44）100-xTix，其中，Cu9Zr4，Cu61.8Zr38.2和Cu44为Cu-Zr二元相图中特殊的团簇结构成分．在这三条线上设计合金成分，并利用铜模吸铸法制备直径为3mm合金棒．X射线衍射和透射电子显微分析表明：沿这三条成分线分别在Ti含量为x=7．5％-15％，x=7．5％-12．5％和z=5％-12％的成分区间内形成了块体非晶．热分析实验进一步表明这些块体非晶合金均具有较高的热力学参数Tg，Tx，Tg／Tl，和r值，且每个系列非晶合金的Tg，Tx，Tg／Tl，和r值均随合金中Ti含量增加而单调下降.其中，（Cu9/13Zr4/13）100-xTix系列中Cu64Zr28.5Ti7.5非晶合金具有最高的热力学参数值，最高的硬度以及最大的晶化激活能，其值为Tg=736K，t=769K，Tg／Tl=0．627，r=0．403，Hv=6．74GPa，△E=3．88eV；皆优于已报道的参考成分Cu60Zr30Ti10．

英文摘要：

The present paper investigates the formation and composition characteristics of Cu-based bulk metallic glasses （BMGs） in the inter-transition metal system Cu-Zr-Ti by using an ＂ e/a-variant criterion＂ which is relevant to clusters. Three such composition lines, （ Cu9/13 Zr4/13 ）100- x Tix, （ Cu0.618 Zr0.382 ）100- x Ti, and （ Cu0.56 Zr0.44 ）100- x Tix, are defined in the Cu-Zr-Ti system. Among them, CugZr4 , Cu61.8Zr38.2 and Cu56Zr44 are specific Cu-Zr binary cluster compositions. Alloy compositions are designed along these three composition lines, and alloy rods with diameter of 3mm are prepared by copper mould casting. X-ray and TEM analysis show that BMGs are formed within Ti content range of x = 7.5%-15%, x = 7.5%-12.5% and x = 5%-12% respectively along these three lines. Thermal analysis results further indicate that these BMGs have higher thermodynamic Tg, Tx, Tg/Tl and r values, and these values of BMGs on every composition line decrease with increasing Ti content. The optimum BMG composition in this system is Cu64Zr28.5Ti7.5 on the （Cu9/13 Zr4/13 ）100-x Tix series, which also has the highest hardness and activation energy of crystallization. The characteristic parameters of this BMG are Tg = 736K, Tx = 769K, Tg/Tl = 0.627,r = 0.403, Hv = 6.74GPa and AE = 3.88 eV, which are all superior to those of the reported BMG Cu60Zr30Ti10.