应用调制差示扫描量热计(Modulated-DSC)分离非晶态合金的玻璃化转变

STUDY OF GLASS TRANSITION AND CRYSTALLIZATION IN FOUR METALLIC GLASSES USING TEMPERATURE MODULATED DSC

应用调制差示扫描量热计对非晶态合金Ｌａ５５Ａｌ２５Ｎｉ１０Ｃｕ１０，Ｍｇ６５Ｚｎ３５，Ｎｄ６０Ｆｅ３０Ａｌ１０以及Ｚｒ３０Ｙ３０Ａｌ１５Ｎｉ２５的玻璃化转变过程进行了研究．在Ｍｇ６５Ｚｎ３５和Ｎｄ６０Ｆｅ３０Ａｌ１０合金中观察到了玻璃化转变；在Ｍｇ６５Ｚｎ３５，Ｎｄ６０Ｆｅ３０Ａｌ１０以及Ｚｒ３０Ｙ３０Ａｌ１５Ｎｉ２５中甚至观察到两个玻璃化转变过程．由于能够清楚地观察到玻璃化转变过程，因此可以得到更加精确的约化玻璃化转变温度（玻璃化转变温度／熔点）．

Glass transition behaviour of some metallic glasses can not be studied and observed by conventional DSC due the fact that they are closely followed by crystallization. However, the newly developed temperature modulated DSC can separate these two transformations. Four metallic glasses, La 55 Al 25 Ni 10 Cu 10 , Mg 65 Zn 35 , Nd 60 Fe 30 Al 10 and Zr 30 Y 30 Al 15 Ni 25 , have been studied by a temperature modulated differential scanning calorimetry (MDSC).It is clearly demonstrated that the glass transition can be separated from crystallization by the MDSC. Two glass transitions have been observed for Mg 65 Zn 35 , Nd 60 Fe 30 Al 10 and Zr 30 Y 30 Al 15 Ni 25 . Due to clearer observation of glass transition, the calculation of reduced glass temperature T rg can now be obtained with greater confidence.