摘要
Thermal diffusivity, specific heat capacity and thermal conductivity of AI86Gd6TM8 （TM = Cu, Ni, Co, Fe, Mn, Cr, Ti, Zr, Mo, Ta） glass-forming alloys in the temperature range of 300-880 K were determined by laser flash method. The temperatures of endothermic and exothermic reactions of the alloys were determined by differential scanning calorimetry method. The alloys were prepared by conventional arc-melting technique under helium atmosphere. All the alloys studied exhibit strong supercooling of the liquidus temperatures up to 80 K, which indicates their good glass-forming ability. The specific heat capacity of the alloys achieves the Dulong-Petit＇s value in the temperature range of 350-550 K except Als6CrsGd6 and Als6ZrsGd6 compositions. The values of both thermal diffusivity and thermal conductivity of the alloy studied are significantly lower than those for pure aluminum. It is found that embedding 14% （mole fraction） of transition elements （Gd＋TM） in the aluminum matrix leads to significant decrease in the absolute magnitudes of both thermal diffusivity and thermal conductivity in crystalline state. The thermal conductivity of glass-forming Als6Gd6TMs alloys is strongly affected by directed chemical bonding between alloy components.
采用激光闪光法确定Al86Gd6TM8（TM=Cu,Ni,Co,Fe,Mn,Cr,Ti,Zr,Mo,Ta）非晶合金在300~880 K时的热扩散系数、比热容和导热系数。利用差示扫描量热法确定合金放热和吸热反应温度。在氦气保护下采用传统的电弧熔炼法制备合金。所有合金的液相线过冷度高达80 K,这表明它们具有很好的非晶形成能力。在温度为350~550 K时,除Al86Cr8Gd6和Al86Zr8Gd6合金外,其它合金的比热容都符合Dulong–Petit定则。合金的热扩散系数和导热系数值都远低于纯铝的。同时发现在铝基体中添加14%（摩尔分数）的过渡元素（Gd＋ТM）会大大降低晶态合金热扩散系数和导热系数的绝对值。合金组份间化学键强烈影响非晶Al86Gd6TM8合金的导热系数。
基金
Project(13-02-96036) supported by RFBR and the Government of Sverdlovsk Region of Russia
