【摘要】 本文系统地研究了结构驰豫对Cu58.1Zr35.9Al6块状非晶合金弹性性能的影响。将Cu58.1Zr35.9Al6非晶合金在150℃、300℃、450℃分别保温1 h。测量退火样品的纵、横波声速,并推算其弹性性能。结果表明:随退火温度的升高,声速与弹性性能呈现逐渐增加的趋势。低温驰豫时声速与弹性性能变化缓慢,高温驰豫时增加明显。基于结构驰豫谱模型分析了上述现象的产生在于:提高温度,原子有足够的条件进行中程与长程扩散,通过发生原子的积聚重排,大量自由体积的湮灭,使非晶样品的有序度得到大大的改善。更多还原

【Abstract】 The effect of structure relaxation on the elastic property of Cu based bulk metallic glass was investigated systematically.Cu58.1Zr35.9Al6 metallic glass was annealed at 150 ℃、300 ℃ and 450 ℃ for 1 hour.The longitudinal wave velocity and transverse wave velocity are measured so that the elastic property could be deduced.The result reveals that the velocity and elastic properties increases gradually with the elevation of the annealing temperature.Acoustic velocity and elastic indexes changes slightly at low-temperature relaxation,they increase obviously at high-temperature relaxation.These phenomena were analyzed in terms of the structure relaxation mode.The reasons is that atoms have sufficient conditions for intermediate-range and long-range diffusion and the order degree is greatly improved by the accumulation and rearrangement of atoms as well as the large annihilation of the free volume with the increasing temperature.更多还原