期刊
BULLETIN OF MATERIALS SCIENCE
卷 38, 期 7, 页码 1693-1698出版社
INDIAN ACAD SCIENCES
DOI: 10.1007/s12034-015-1051-4
关键词
Metallic glass; Gibbs free energy; critical size
资金
- Department of Science & Technology (DST), Government of India
A quantitative measure of the stability of a glass as compared to its corresponding crystalline state can be obtained by calculating the thermodynamic parameters, such as the Gibbs free energy difference (Delta G), entropy difference (Delta S) and the enthalpy difference (Delta H) between the super-cooled liquid and the corresponding crystalline phase. Delta G is known as the driving force of crystallization. The driving force of crystallization (Delta G) provides very important information about the glass-forming ability (GFA) of metallic glasses (MGs). Lesser the driving force of crystallization more is the GFA. The Delta G varies linearly with the critical size (d (c)). According to Battezzati and Garonne the parameter gamma ( = ( 1-(Delta H (x) /Delta H (m))/(1-(T (x) /T (m)))) in the expression for Delta G should be a constant (i.e., 0.8), but its uniqueness is not observed for all MGs. The thermal stability of various alloy compositions is studied by their undercooled liquid region (Delta T = T (x) -T (g)). Large Delta T (x) implies greater stability against crystallization of the amorphous structure. Other GFA parameters are also calculated and correlated with critical size (d (c)).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据