铜的高压声速和冲击熔化

 用光分析技术，测量了在一维应变冲击条件下，无氧铜的高压下声速，压力范围为125~170 GPa。将上述结果与Broberg、Morris等和Aльгшуер等过去发表的数据结合在一起，对0~170 GPa整个压力区间的声速数据做了综合分析，给出了声速随压力的变化规律。实验结果发现，无氧铜在156~159 GPa之间开始发生冲击熔化，到170 GPa左右，完全进入液相区；对于处于0~156 GPa固体无氧铜的弹性声速c_l可用ln c_l=1.565 888-2.645 488×10^-2ln p+2.710 681×10^-2ln²p拟合公式描述（p的单位为GPa，c_l的单位为km/s），拟合值与实验值的相对误差小于1.3%。

SOUND VELOCITIES AT HIGH PRESSURES AND SHOCK-MELTING OF COPPER

Sound velocities of copper at high shock pressures were determined by using optical analyzer technique under on-dimensional strain condition. The measured pressure range was from 125 GPa to 170 GPa. Combined with the data given earlier by Broberg, Morris et al., Altshuler et al., and ours, a comprehensive analysis for sound velocities at pressures of 0~170 GPa was also made. It shows the elastic sound velocity c_l of solid-state copper, when the pressure is between 0~156 GPa, monotonically increases with the increasing of shock pressure and can be represented by the following equation ln c_l=1.565 888-2.645 488×10^-2ln p+2.710 681×10^-2ln²p. Relations errors between the data deduced from the above equation and the measurement are less than 1.3%. Moreover, the shock-melting, marked as the sudden drop of sound velocity in c-p relation, occurs at 156~159 GPa and completes at about 170 GPa, for which a rather satisfactory verification is also acquired by the Lindeman melting-law in the analysis.