Cu-Zr-Ti系Cu基块体非晶合金的形成和成分优化  

Formation and composition optimization of Cu-based bulk metallic glasses in Cu-Zr-Ti ternary system

作　　者：王清[1] 羌建兵[1] 王英敏[1] 夏俊海[1] 林哲[1] 张新房[1] 董闯[1] 

机构地区：[1]大连理工大学三束材料改性国家重点实验室及原材料特种制备技术实验室,材料工程系大连116024

出　　处：《物理学报》2006年第1期378-385,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50271012和50401020)资助的课题~~

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Cu56Zr44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x=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γ值,且每个系列非晶合金的Tg,Tx,Tg/Tl,和γ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,Tx=769K,Tg/Tl=0·627,γ=0·403,Hν=6·74GPa,ΔE=3·88eV;皆优于已报道的参考成分Cu60Zr30Ti10.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.

关 键 词：块体非晶合金 Cu-Zr-Ti合金 原子团簇 电子浓度 

分 类 号：TG139.8[一般工业技术—材料科学与工程]