Open AccessCrystallization behavior and thermal stability of Al-Ni-RE metallic glasses
Author(s) -
Zhang Zhang,
Xiong Xian-Zhong,
Yi Jiao-Jiao,
Jin-Fu Li
Publication year - 2013
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.62.136401
Subject(s) - crystallization , amorphous metal , materials science , nanocrystalline material , instability , differential scanning calorimetry , atomic radius , thermal stability , thermodynamics , diffraction , amorphous solid , alloy , differential thermal analysis , enthalpy , metal , crystallography , chemical engineering , metallurgy , nanotechnology , physics , optics , chemistry , quantum mechanics , mechanics , engineering
A series of Al-Ni-RE (RE=La, Ce, Y) amorphous ribbons were prepared. The crystallization behavior and primary phases were investigated using X-ray diffraction and differential scanning calorimeter, and their relationships with the alloy composition and atomic features were analyzed. Results show that if the topological instability parameter λ was modified using effective atomic radii, the metallic glasses in an Al-Ni-RE system can be classified into nanocrystalline, nanoglassy and glassy types according to their crystallization behaviors by two critical values of the modified topological instability parameter λ'. Linear relationships of onset temperature of crystallization and mixing enthalpy with λ' are also clearly revealed, indicating that λ' is closely related to the thermal stability of Al-Ni-RE metallic glasses.