Preface

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• 作者：Aysen Muezzinoglu ; Aysel T. Atimtay ; Selahattin Incecik
• 关键词：Ni₆₀Al₁₅Cu₁₅Ni_7.5Co_2.5 ; Zr₆₅Al_7.5Cu_27.5 ; Metallic glass ; Specific heat ; Glass transition ; Structural relaxation
• 刊名：Environment International
• 出版年：2008
• 出版时间：July 2008
• 年：2008
• 卷：34
• 期：5
• 页码：579
• 全文大小：85 K

文摘

The specific heat of Zr-based Zr₆₀Al₁₅Cu₁₅Ni_7.5Co_2.5 and Zr₆₅Al_7.5Cu_27.5 metallic glasses was measured in the temperature range from 77 to 800 K using an ac calorimeter. Several exothermic and endothermic processes were observed indicating the transformation sequences required to completely crystallize both glasses. A decrease in the specific heat is ascribed to structural relaxation. The specific heat increases monotonically through the glass transition temperature (T_g), peaks and then decreases abruptly with increasing temperature. The amplitude and maximum temperature (T_p) of the peak increase with an increase of heating rate. The T_p increases from 729 K at 2 K min⁻¹ to 774 K at 40 K min⁻¹.