表征镁基非晶合金形成能力参数的评价  

Evaluation of the parameters related to the glass-forming ability of Mg-based bulk metallic glasses

作　　者：李双寿[1] 张琦[1,2] 林万明[2] 董占民[3] 

机构地区：[1]清华大学基础工业训练中心,北京100084 [2]太原理工大学材料科学与工程学院,太原030024 [3]清华大学物理系,北京100084

出　　处：《清华大学学报（自然科学版）》2014年第11期1475-1480,共6页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(21153003)

摘　　要：为了研究合金的物理、化学性质对非晶合金形成能力的影响,采用统计学方法研究了原子尺寸差σ、电负性差Δx、τ和φ各参数对镁基非晶合金形成能力的影响。结果表明:σ、Δx、τ和φ可有效表征镁基非晶合金形成能力,且以二次函数的拟合方式可比线性方式更好地描述合金原子堆垛密度、原子间的键合强度与非晶形成能力之间的关系,并可作为共晶团簇理论设计合金成分的参考标准和判定非晶形成能力和稳定性的理论依据;τ和φ充分考虑到了原子尺寸、电负性、元素百分比等物理因素对非晶合金形成过程的影响,准确地表征原子堆垛密度和原子间的键合强度,与临界制备尺寸的拟合程度优于其他表征参数,且具有计算简单和稳定性高的特点。To study the effect of physical and chemical properties on the glass-forming ability, key parameters of Mg-based alloys, such as б△x、r and φ are calculated using the weighted averages princi- ple with the correlation coefficients between parameters and the glass-forming ability （GFA）. The results show that larger б△x、r and φ increase the GFA of the alloy. The relationships between the atomic packing density, the bonding strength between atoms and these parameters are evaluated using the reference standard for the alloy composition designed from eutectic formulae and theoretical pa- rameters for the stability and GFA. The effects of atomic size, elec- tronegativity difference and the percentage of elements in the crystal- lization process are related to r and φ. Comparisons with other pa-rameters show that r and φ give higher computational stability and simpler calculations.

关 键 词：镁基非晶合金 非晶形成能力 参数 

分 类 号：TB31[一般工业技术—材料科学与工程] TG146.22[金属学及工艺—金属材料]