Ⅰ-Ⅱ-Ⅲ Phase Transition of Bismuth under Magnetically Driven Ramp Wave Loading
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摘要: 设计了一套与磁驱动斜波加载实验装置CQ-4配套的样品预设温度系统,温度范围为室温至180℃。利用此装置联合双源光外差测速系统,完成了不同初始温度下铋的斜波压缩相变实验,并在单发实验中获得了同时含有Ⅰ-Ⅱ和Ⅱ-Ⅲ两次相变信息的速度剖面。实验结果显示,随着铋的初始温度从室温提高到148℃,Ⅰ-Ⅱ相变和Ⅱ-Ⅲ相变起始对应的特征拐点速度分别从251.6和275.7 m/s下降到239.4和259.7 m/s。Abstract: In this study, we developed a sample pre-heating system with the temperature range from room temperature to 180℃, matching with the magnetically driven apparatus CQ-4.The ramp wave compression experiments of bismuth under different initial temperatures (25-148℃) were carried out, using this pre-heating system on CQ-4.The free surface velocity profiles, measured by a dual laser heterodyne velocimetry, show clearly two phase transitions of bismuth during the compression.Furthermore, with the initial temperature increasing from room temperature to 148℃, the characteristic free surface velocities corresponding to the onsets of Ⅰ-Ⅱ and Ⅱ-Ⅲ phase transition decreases from 251.6 and 275.7 m/s to 239.4 and 259.7 m/s, respectively.
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Key words:
- ramp wave compression /
- initial temperature /
- phase transition /
- bismuth /
- velocity profile
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表 1 实验条件
Table 1. Experimental conditions
Exp.No. T0/℃ Position Material Dimension Shot 342 100 Plate
Sample
BeddingAl
Bi
Sapphire10.0 mm×30.0 mm×0.971 mm
∅7.9 mm×1.178 mm
10.0 mm×28.0 mm×0.800 mmShot 343 148 Plate
Sample
BeddingAl
Bi
Sapphire10.0 mm×30.0 mm×1.001 mm
∅7.9 mm×1.131 mm
10.0 mm×28.0 mm×0.798 mmShot 344 25 Plate
Sample
BeddingAl
Bi
Sapphire10.0 mm×30.0 mm×0.983 mm
∅7.9 mm×1.150 mm
10.0 mm×28.0 mm×0.796 mm表 2 两次相变对应的特征速度和压力
Table 2. Characteristic free surface velocities and pressures corresponding to the two phase transitions
Exp.No. T0/℃ Characteristic velocity/(m·s-1) Phase transition pressure/GPa Ⅰ-Ⅱ Ⅱ-Ⅲ Ⅰ-Ⅱ Ⅱ-Ⅲ Shot 344 25 251.6 275.7 2.53 2.81 Shot 342 100 244.9 266.0 2.45 2.69 Shot 343 148 239.4 259.7 2.39 2.62 -
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