摘要
用光分析技术,测量了在一组应变冲击条件下,无氧铜的高压下声速,压力范围为125-170GPa。将上述结果与Broberg、Morris等和等过去发表的数据结合在一起,对0—170GPa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—159GPa之间开始发生冲击熔化,到170GPa左右,完全进入液相区;对于处于0—156GPa固体无氧铜的弹性声速c_1可用lnc_1=1.565888—2.645488×10^(-2)lnp+2.710681×10^(-2)ln^2p拟合公式描述(p的单位为GPa,c_1的单位为km/s),拟合值与实验值的相对误差小于1.3％。
Sound velocities of copper at high shock pressures were determined by using optical analyzer technique under one-dimensional strain condition. The measured pressure range was from 125GPa to 170GPa. Combined with the data given earlier by Broberg. Morris et al., Al'tshuler et al.. and ours, a comprehensive analysis for sound velocities at pressures of 0-170GPa was also made. It shows the elastic sound velocity c, of solid-state copper, when the pressure is between 0-156GPa, montonically increases with the increasing of shock pressure and can be represented by the following equationInc1=1.566-2. 645×10-2lnp+2. 711×10-2In2p (p-GPa. c1-km/s)Relative 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 156-159GPa and completes at about 170GPa. for which a rather satisfactory verification is also acquired by the Lindeman melting-law in the analysis.
出处
《高压物理学报》
CAS
CSCD
北大核心
1989年第3期187-197,共11页
Chinese Journal of High Pressure Physics
关键词
铜
高压声速
冲击熔化
光分析技术
optical analyzer technique, sound velocity at high pressure, shock-melting.
