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研究冷却速率对Cu49Hf42Al9金属玻璃热膨胀行为的影响。为了得到较大范围的冷却速率,制备了5种不同尺寸的非晶样品(冷却速率范围为102~107K/s)。淬火态样品的平均热膨胀系数(αaver)分布于6.14×10-6K-1至9.20×10-6K-1之间。在玻璃转变温度(Tg)以下时,淬火态样品的平均热膨胀系数(αaver)与冷却速率呈反比;退火态与晶态样品具有相似的平均热膨胀系数。结果表明,自由体积的数量和运动对于金属玻璃的热膨胀具有重要作用。
The effect of cooling rate on the thermal expansion behavior of Cu49Hf42Al9 metallic glass was investigated. In order to obtain a wide range of cooling rate, five different size amorphous samples were prepared (cooling rate range of 102 ~ 107K / s). The average coefficient of thermal expansion (αaver) of quenched samples ranged from 6.14 × 10-6K-1 to 9.20 × 10-6K-1. The average coefficient of thermal expansion (αaver) of quenched samples is inversely proportional to the cooling rate below the glass transition temperature (Tg); the annealed and crystalline samples have similar average coefficients of thermal expansion. The results show that the amount and movement of free volume plays an important role in the thermal expansion of metallic glass.