Open AccessThe ignition-proof effect of Ca and Be in Mg alloys
Author(s) -
Yangwu Guo,
Rongde Li,
Guili Liu
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.3315
Subject(s) - materials science , embedding , surface energy , energy (signal processing) , instability , solid solution , spark (programming language) , cluster (spacecraft) , chemical engineering , chemical physics , thermodynamics , physics , composite material , metallurgy , mechanics , quantum mechanics , artificial intelligence , computer science , engineering , programming language
The atomic cluster models of α-Mgliquid Mg and the interface between liquid/solid have been founded. The environment-sensitive embedding energy of Ca and Be in α-Mgliquid Mgliquid/solid interface has been calculated by recursion method. The atomic affinity energy between MgCaBe with O has been defined and calculated. The calculated results show that the solid solubility of Ca and Be is very small in α-Mgbecause of their higher environment-sensitive embedding energy leads to instability in α-Mg crystal. The Ca and Be diffuse in to the liquid Mg, which has lower environment-sensitive embedding energy than the solidand congregate on the surface of liquid Mg as the alloys solidify. Because the atomic affinity energy of Ca-O and Be-O is lower than Mg-OThe Ca and Be aggregating on the surface of liquid Mg will priorly combined with Oforming compact oxides of CaBe and alloys of elementswhich prevent Mg alloys from burning.