Al85Ni5Y6Fe2Co2金属玻璃在240 ℃等温退火15 min后, 示差扫描量热仪(DSC)曲线出现2个吸热台阶, 一般认为该现象由2个玻璃转变引起, 但温度调制示差扫描量热仪(TMDSC)结果表明2个吸热台阶并非对应2个玻璃转变. 透射电子显微镜Z衬度相及EDS扫描曾观测到300 ℃非等温退火的样品发生非晶相分离现象, 但TMDSC在该样品中也仅观测到1个玻璃转变.
An Al85Ni5Y6Fe2Co2 metallic glass was prepared by melt spinning. Two endothermic steps were observed on the normal differential scanning calorimetry, which is mostly ascribed to two glass transition processes caused by amorphous phase separation. Temperature modulated differential scanning calorimetry (TMDSC) reveals that the two endothermic steps are not attributed to two glass transition processes. High-angel annular detector dark-field scanning transmission electron microscopy (HAADF-STEM) and EDS formerly gave evidence of amorphous phase separation for the sample heated to 300oC. Only one glass transition was observed on the reversible heat flow of the TMDSC curves for this sample.
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