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pISSN : 1598-706X / eISSN : 2288-8381


한국주조공학회지 (29권4호 181-186)

Evaluation of Glass-forming Ability in Ca-based Bulk Metallic Glass Systems

칼슘기 벌크 비정질 합금에서 비정질 형성능 평가

Eun-Soo Park*, Do-Hyang Kim

*Seoul National University, Yonsei University


The interrelationship between new parameter σ and maximum diameter Dmax is elaborated and discussed in comparison with four other glass forming ability (GFA) parameters, i.e. (1) super-cooled liquid region ΔTx (=Tx − Tg), (2) reduced glass transition temperature Trg (=Tg/Tl), (3) K parameter K (=[Tx − Tg]/[Tl − Tx]), and (4) gamma parameter γ (= [Tx]/[Tl + Tg]) in Ca-based bulk metallic glass (BMG) systems. The σ parameter, defined as ΔT* × P', has a far better correlation with Dmax than the GFA parameters suggested so far, clearly indicating that the liquid phase stability and atomic size mismatch dominantly affect the GFA of Ca-based BMGs. Thus, it can be understood that the GFA of BMGs can be properly described by considering structural aspects for glass formation as well as thermodynamic and kinetic aspects for glass formation.


Ca-based alloy, Bulk metallic glass, Glass-forming ability, σ parameter .