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进行了10—27 GPa应力范围内Zr51Ti5Ni10Cu25Al9金属玻璃的平面冲击实验以研究其高压-高应变率加载下的塑性行为.由样品自由面粒子速度剖面的分析获得了冲击加载过程的轴向应力,并通过轴向应力与静水压线的比较获得剪应力.实验结果表明,尽管存在明显的松弛效应,但Zr基金属玻璃的Hugoniot弹性极限随着冲击应力的增加而增加.然而,塑性波阵面上的剪应力则显示先硬化而后软化现象,而且软化的幅度随冲击应力的增加而增加.冲击加载下Zr基金属玻璃的上述剪应力变化特征与分子动力学模拟结果比较一致,但与压剪实验结果和一维应力冲击实验结果明显不同. 相似文献
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Measurement of transient Raman spectrum on gas-gun loading platform and its application in liquid silane 下载免费PDF全文
Combining a low temperature liquidizing system with a transient Raman spectroscopy, a new experimental technique is established for the first time on a two-stage light-gas gun, and it is employed to study shock-compressed fluid silane. With this experimental technique, we first obtain a Raman peak shift relating to the Si–H stretching vibration mode of molecular liquid silane under shock loading conditions. The Raman peak of 2184 cm~(-1) at an initial state of 0 GPa and 85 K moves to 2223.4 cm~(-1) at a shocked state of 10.5 GPa and 950 K, and its full width of half maximum broadens from 33 cm~(-1) to 118 cm~(-1). The shocked temperature, calculated by the thermodynamic equation of state, is well consistent with that estimated by the Doppler broadening function. 相似文献
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Al、Cu、Ta高压熔化曲线的理论计算 总被引:1,自引:0,他引:1
由位错熔化理论和不同的静高压实验数据优化的体模量(B0)、剪切模量(G0)及它们对压力的一阶偏导数(B′0、G′0)值计算了Al、Cu、Ta的高压熔化曲线.理论计算的Al、Cu高压熔化曲线与静、动高压实验值较为吻合,Ta的理论高压熔化曲线与动高压实验结果一致,但与静高压实验结果相差较大. 相似文献
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The melting curve of Sn has been calculated using the
dislocation-mediated melting model with the `zone-linking method'.
The results are in good agreement with the experimental data. According
to our calculation, the melting temperature of γ -Sn at zero
pressure is about 436~K obtained by the extrapolation of the method
from the triple point of Sn. The results show that this calculation
method is better than other theoretical methods for predicting the
melting curve of polymorphic material Sn. 相似文献
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平面波透镜是爆炸力学实验中不可缺少的实验工具,是一种将球面波转化为平面波的爆轰元件。对于波形的整形作用,使用硝基甲烷-铅代替高、低爆速炸药设计平面波透镜,具有药量小、加工工艺简单、操作方便等优点。 相似文献
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对研究材料高压熔化曲线的主要实验技术和理论方法进行分析,认为目前对熔化曲线的研究存在的主要问题是:对于复杂相变材料、特别是过渡金属,静压DAC实验和动态冲击实验得到的熔化曲线数据有很大差异,目前没有理论模型可以解释此差异;考虑电子效应对熔化曲线的影响可能帮助解决此问题。 相似文献
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