Ultrasound-Induced Structural Anomaly of Supercooled Liquid in Some Bulk Metallic Glasses
Ultrasound-Induced Structural Anomaly of Supercooled Liquid in Some Bulk Metallic Glasses
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DOI：
10.2320/matertrans.45.1189
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发表时间：
2004-04
影响因子：
1.2
通讯作者：
T. Ichitsubo;E. Matsubara;K. Anazawa;N. Nishiyama;S. Kai;M. Hirao
中科院分区：
文献类型：
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作者：
T. Ichitsubo;E. Matsubara;K. Anazawa;N. Nishiyama;S. Kai;M. Hirao
我们利用高温下高频超声振动研究了完全结构松弛的 Pd40Ni40P20 和 Zr55Al10Ni5Cu30 大块金属玻璃的弹性和滞弹性行为，发现结构异常是由过冷液体区域中的超声振动引起的。采用电磁共振和共振超声光谱方法测量共振谱和超声衰减系数。当玻璃状样品在加热过程中受到亚/低MHz超声振动时，在其玻璃化转变温度附近结晶加速，并且随着这种突然的结构变化，出现不规则形状的内耗峰。从超声回波描记术的角度来看，在目前的测量中，超声振动大大降低了玻璃化转变温度和结晶温度。
We have studied the elastic and anelastic behavior of fully structural-relaxed Pd40Ni40P20 and Zr55Al10Ni5Cu30 bulk metallic glasses using high-frequency ultrasound vibrations at elevated temperature, and found that the structural anomaly is induced by ultrasound vibrations in a supercooled liquid region. The electromagnetic acoustic resonance and resonant ultrasound spectroscopy methods were employed to measure the resonant spectra and ultrasonic attenuation coefficients. When the glassy samples are subjected to sub/low-MHz ultrasound vibrations during heating process, the crystallization is accelerated around their glass transition temperatures, and with this abrupt structural change, irregular � shaped internal friction peaks appear. From the standpoint of ultrasonic echography, the glass transition and crystallization temperatures are considerably lowered by ultrasound vibrations in the present measurements.