Ultrasonic Measurement and Isothermal Equation of State for LY12Al under Static Pressures
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摘要: 利用脉冲回波重合法测量了多晶LY12铝在流体静压加载下的纵波与横波声速随压力的变化。并根据较低压力（0.5 GPa）下的超声测量数据所确定的零压弹性模量及其对压力的偏导数，导出了LY12铝的Murnaghan、Birch-Murnaghan、Vinet三种不同形式的等温状态方程，发现由超声测量数据导出的Vinet 状态方程能很好地描述面心立方（fcc）结构的铝与铝合金在较高压力（约200 GPa）下的压缩特性。此外，由超声数据计算了LY12铝在室温常压条件下的Debye温度为430.97 K、热力学Grneisen系数为2.025、平均声模Grneisen系数为2 379。Abstract: The sound velocities of longitudinal wave and transverse wave for LY12Al were measured under static pressures using pulse echo overlap technique. According to the bulk modulus at zero pressure, KS0, and its pressure derivative KS0 yielded from the ultrasonic meansurements under very low pressures (0.5 GPa), three Isothermal Equations of StateMurnaghan EOS, Birch-Murnaghan EOS and Vinet EOS for LY12Al were reduced. It was found that the Vinet EOS deduced from ultrasonic data was adequate for describing the compressibility of aluminium and its alloy with fcc structure, even up to 200 GPa. Furthermore, the zero pressure Debye temperature and thermodynamic Grneisen parameter calculated from the ultrasonic data for LY12Al are 430.97 K and 2 025, respectively.
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Key words:
- ultrasonic measurements /
- isothermal equation of state /
- LY12Al
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