Open AccessEffect of Nb addition on the glass transition and crystallization kinetics of bulk Cu-Zr metallic glasses
Author(s) -
Qisheng Feng,
Qing Wang,
Zhao Zhe-Long,
Yanhua Dong
Publication year - 2007
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.56.1292
Subject(s) - materials science , differential scanning calorimetry , amorphous metal , crystallization , glass transition , fragility , activation energy , alloy , amorphous solid , kinetics , casting , thermal stability , copper , metallurgy , thermodynamics , chemical engineering , composite material , crystallography , chemistry , polymer , engineering , physics , quantum mechanics
In the present work, bulk Cu50.3Zr49.7-xNbx(x=0,2) amorphous alloys 2 mm in diameter were produced by copper mold suction casting. The effect of Nb addition on the glass transition as well as crystallization kinetics of the binary Cu based amorphous alloy has been investigated by using differential scanning calorimetry (DSC). It is found that the alloy containing 2%Nb has a lower fragility parameter m and higher crystallization activation energy Ec, which suggests that the thermal stability and hence the glass forming ability of the surpercooled metallic liquid for the Cu based alloy are enhanced by the addition of very small amounts of Nb element.