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TMDSC表征Al₈₅Ni₅Y₆Fe₂Co₂金属玻璃的玻璃转变

IDENTIFYING THE GLASS TRANSITIONS IN Al₈₅Ni₅Y₆-Fe₂Co₂ METALLIC GLASS USING TEMPERATURE MODULATED DIFFERENTIAL SCANNING CALORIMETRY

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【Author】 YANG Hongwang~(1,2)) TONG Weiping~(1)) ZHAO Xiang~(1)) ZUO Liang~(1)) WANG Jianqiang~(3)) 1)Institute of Materials Research,School of Materials and Metallurgy,Northeastern University,Shenyang 110004 2)School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110178 3)Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016

【机构】东北大学材料与冶金学院材料所；沈阳工业大学材料科学与工程学院；中国科学院金属研究所沈阳材料国家(联合)实验室；

【摘要】 Al₈₅Ni)5Y)6Fe₂Co₂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,—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.更多还原

【Abstract】 Two endothermic steps were observed on the normal differential scanning calorimetry （DSC）of Al₈₅Ni₅Y₆Fe₂Co₂ metallic glass prepared by melt spinning,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 annealed non-isothermally at 300℃,but only one glass transition was observed on the reversible heat flow of the TMDSC curves for this sample.更多还原