[100]LiF单晶在60 GPa以内冲击加载下的高压屈服强度特性

谭叶; 李雪梅; 俞宇颖; 南小龙; 甘元超; 叶想平; 胡建波; 王倩男

doi:10.11883/bzycj-2021-0242

[100]LiF单晶在60 GPa以内冲击加载下的高压屈服强度特性

doi: 10.11883/bzycj-2021-0242

中国工程物理研究院流体物理研究所冲击波物理与爆轰物理重点实验室，四川绵阳 621999

基金项目: 国家自然科学基金（11772312, 11802285）；冲击波物理与爆轰物理重点实验室基金（6142A0302010317）

详细信息

作者简介:
谭　叶（1986－　），男，硕士，副研究员，typppku@163.com

通讯作者:
李雪梅（1975－　），女，硕士，副研究员，lixuem@caep.cn

中图分类号: O389
计量
- 文章访问数: 262
- HTML全文浏览量: 118
- PDF下载量: 32
- 被引次数: 0
出版历程
- 收稿日期: 2021-06-21
- 修回日期: 2022-02-25
- 网络出版日期: 2022-04-11
- 刊出日期: 2022-05-09

Yield strength of [100] LiF under shock compression up to 60 GPa

National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

摘要

摘要: 获取光学窗口自身的高压强度特性是开展材料高压高应变率冲击响应行为精密测量和数据反演的重要基础。利用平板撞击和双屈服面法，通过冲击-卸载、冲击-再加载原位粒子速度剖面精细测量和数据反演，获得了约60 GPa范围内[100]LiF屈服强度特性随冲击压力的变化规律。结果表明：在实验压力范围内，[100]LiF的屈服强度随加载压力的提高而显著提高，压力硬化效应显著；同时，LiF在冲击加载下的屈服强度高于磁驱准等熵加载结果，应变率硬化效应强于热软化效应。采用Huang-Asay模型确定了可描述冲击加载[100]LiF强度特性的本构模型参数，为LiF在强度、相变、层断裂等加窗测量实验中的深入应用和数据准确解读提供了重要支撑。
- [100]LiF /
- 屈服强度 /
- 冲击加载 /
- 双屈服面法
Abstract: The dynamic properties of metals are of importance in shock wave physics, and the time-resolved velocity profile measurement at the interface between the sample and the optical window is often used to decrease the waveform aberrations arising from free-surface reflecting and to obtain the in-situ particle velocity profile in the studied sample. In such cases, the yield strength behavior of the optical window should be taken into account for precise data processing. Among kinds of optical window materials, [100] lithium fluoride (LiF) single crystal is the most widely used window, and little work has been done for its yield strength behavior under dynamic loadings, especially planar shock. In this paper, by using the plate impact and Asay self-consistent technique for high-pressure yield strength, in-situ velocity profiles of the [100] LiF single crystal from shock-release and shock-reshock loading at different pressures were carefully measured by a displacement interferometer system for any reflector (DISAR). Then, the yield strengths under shock compression up to about 60 GPa were educed and found to markedly increase with the increasing of shock pressure, showing a notable pressure-hardening effect. Moreover, by comparing with the results from magnetically-driven isentropic loading in literatures which were the scanty public reports for the high-pressure yield strength of LiF, it was also found that the yield strengths of the [100] LiF under shock compression were higher than those obtained from isentropic loading at the same pressures. This indicates that LiF’s yield strength is more sensitive to strain rate than to temperature up to 60 GPa, and the higher strain rate under shock compression and the dominant strain rate hardening effect results in a higher yield strength. At last, the constitutive model parameters for the [100] LiF were determined to fit to our shock experiments well by using the Huang-Asay equation form. The result above shows that the [100] LiF owns an unignorable flow strength under shock pressures at least to 60 GPa. Moreover, it provides important constitutive parameters for educing the in-situ velocity profiles more accurately in experiments where LiF is used as an optical window, which is essential for researches such as flow strength, phase transition, and shock melting of metal materials.
- [100] LiF /
- yield strength /
- shock compression /
- Asay self-consistent technique

HTML全文

图 1 冲击加载下双屈服面法强度测量基本原理

Figure 1. Schematic illumination for the Asay self-consistent method of strength determination

下载: 全尺寸图片幻灯片

图 2 典型的LiF样品卸载、再加载界面速度剖面测量结果（p=6.4 GPa，z-切石英飞片）

Figure 2. Typical release/reshock velocity profiles measured at the sample-window interfaces for [100] LiF (p=6.4 GPa, z-quartz flyer)

下载: 全尺寸图片幻灯片

图 3 典型的LiF样品卸载、再加载界面速度剖面测量结果（p=26.4 GPa, Cu 飞片）

Figure 3. Typical release/reshock velocity profiles measured at the sample-window interfaces for [100] LiF (p=26.4 GPa, Cu flyer)

下载: 全尺寸图片幻灯片

图 4 典型的LiF样品卸载、再加载界面速度剖面测量结果（p=55.9 GPa, LiF 飞片）

Figure 4. Typical release/reshock velocity profiles measured at the sample-window interface for [100] LiF (p=55.9 GPa, LiF flyer)

下载: 全尺寸图片幻灯片

图 5 数据反演获得的[100]LiF声速-原位粒子速度曲线及屈服强度-压力关系

Figure 5. Sound speed-in-situ particle velocity profiles and pressure dependence of strengths for [100] LiF educed from experimental data

下载: 全尺寸图片幻灯片

图 6 不同加载路径下[100]LiF的屈服强度比较

Figure 6. Comparison of yield strengths between planar shock and isentropic loading for [100] LiF

下载: 全尺寸图片幻灯片

表 1 主要实验参数及结果

Table 1. Main experimental parameters and results

实验	飞片/衬垫	w_f/（m·s⁻¹）	h_f/mm	h_s/mm	（τ_c+τ₀）/GPa	（τ_c−τ₀）/GPa	Y/GPa	p/GPa
S-01	z-切石英/PC	789	3.0	0, 3.066	0.11		0.18	6.4
S-02	z-切石英/Cu	765	3.0	0, 3.083		0.07	0.18	6.4
S-03	OFHC/PC	1 262	1.533	0, 2.573	0.29		0.47	14.7
S-04	OFHC/Ta	1 233	1.497	0, 2.604		0.17	0.47	14.7
S-05	OFHC/PC	1 684	1.507	0, 3.082	0.53		0.97	21.4
S-06	OFHC/Ta	1 735	1.529	0, 3.087		0.44	0.97	21.4
S-07	OFHC/PC	2 055	1.528	0, 3.013	0.61		1.01	26.4
S-08	OFHC/Ta	1 993	1.520	0, 2.995		0.40	1.01	26.4
S-09	OFHC/PC	2 394	1.551	0, 3.021	0.84		1.19	32.8
S-11	LiF/PC	4 920	2.633	12.0（窗口）	1.46		1.69	55.9
S-12	LiF/LY12	5 040	2.621	12.0（窗口）		0.23	1.69	55.9

下载: 导出CSV

参考文献(26)

[1]	EDWARDS R J, ROTHMAN S D, VOGLER T J, et al. Inferring the high-pressure strength of copper by measurement of longitudinal sound speed in a symmetric impact and release experiment [J]. Journal of Applied Physics, 2019, 125(14): 145901. DOI: 10.1063/1.5068730.
[2]	SMITH R F, EGGERT J H, SACULLA M D, et al. Ultrafast dynamic compression technique to study the kinetics of phase transformations in bismuth [J]. Physical Review Letters, 2008, 101(6): 065701. DOI: 10.1103/PhysRevLett.101.065701.
[3]	李雪梅, 俞宇颖, 谭叶, 等. Bi在固液混合相区的冲击参数测量及声速软化特性 [J]. 物理学报, 2018, 67(4): 046401. DOI: 10.7498/aps.67.20172166. LI X M, YU Y Y, TAN Y, et al. Softening of sound velocity and Hugoniot parameter measurement for shocked bismuth in the solid-liquid mixing pressure zone [J]. Acta Physics Sinica, 2018, 67(4): 046401. DOI: 10.7498/aps.67.20172166.
[4]	STEINBERG D J, COCHRAN S G, GUINAN M W. A constitutive model for metals applicable at high-strain rate [J]. Journal of Applied Physics, 1980, 51(3): 1498–1504. DOI: 10.1063/1.327799.
[5]	PRESTON D L, TONKS D L, WALLACE D C. Model of plastic deformation for extreme loading conditions [J]. Journal of Applied Physics, 2003, 93(1): 211–220. DOI: 10.1063/1.1524706.
[6]	AO T, ASAY J R, DAVIS J P, et al. High-pressure quasi-isentropic loading and unloading of interferometer windows on the veloce pulsed power generator [J]. AIP Conference Proceedings, 2007, 955(1): 1157–1160. DOI: 10.1063/1.2832924.
[7]	ASAY J R, AO T, DAVIS J P, et al. Effect of initial properties on the flow strength of aluminum during quasi-isentropic compression [J]. Journal of Applied Physics, 2008, 103(8): 083514. DOI: 10.1063/1.2902855.
[8]	DAVIS J P, KNUDSON M D, SHULENBURGER L, et al. Mechanical and optical response of [100] lithium fluoride to multi-megabar dynamic pressures [J]. Journal of Applied Physics, 2016, 120(16): 165901. DOI: 10.1063/1.4965869.
[9]	FRATANDUONO D E, BOEHLY T R, BARRIOS M A, et al. Refractive index of lithium fluoride ramp compressed to 800 GPa [J]. Journal of Applied Physics, 2011, 109(12): 123521. DOI: 10.1063/1.3599884.
[10]	李雪梅, 俞宇颖, 张林, 等. [100] LiF的低压冲击响应和1550 nm波长下的窗口速度修正 [J]. 物理学报, 2012, 61(15): 156202. DOI: 10.7498/aps.61.156202. LI X M, YU Y Y, ZHANG L, et al. Elastic-plastic response of shocked [100] LiF and its window correction at 1550 nm wavelength [J]. Acta Physica Sinica, 2012, 61(15): 156202. DOI: 10.7498/aps.61.156202.
[11]	RIGG P A, KNUDSON M D, SCHARFF R J, et al. Determining the refractive index of shocked [100] lithium fluoride to the limit of transmissibility [J]. Journal of Applied Physics, 2014, 116(3): 033515. DOI: 10.1063/1.4890714.
[12]	JENSEN B J, HOLTKAMP D B, RIGG P A. Accuracy limits and window corrections for photon Doppler velocimetry [J]. Journal of Applied Physics, 2007, 101(1): 013523. DOI: 10.1063/1.2407290.
[13]	LIU Q C, ZHOU X M, ZENG X L, et al. Sound velocity, equation of state, temperature and melting of LiF single crystals under shock compression [J]. Journal of Applied Physics, 2015, 117(4): 045901. DOI: 10.1063/1.4906558.
[14]	SEAGLE C T, DAVIS J P, KNUDSON M D. Mechanical response of lithium fluoride under off-principal dynamic shock-ramp loading [J]. Journal of Applied Physics, 2016, 120(16): 165902. DOI: 10.1063/1.4965990.
[15]	VORTHMAN J E, DUVALL G E. Dislocations in shocked and recovered LiF [J]. Journal of Applied Physics, 1982, 53(5): 3607–3615. DOI: 10.1063/1.331140.
[16]	MEIR G, CLIFTON R J. Effects of dislocation generation at surfaces and subgrain boundaries on precursor decay in high-purity LiF [J]. Journal of Applied Physics, 1986, 59(1): 124–148. DOI: 10.1063/1.337044.
[17]	SANO Y, SANO T. Evaluation of the precursor decay anomaly in single crystal lithium fluoride [J]. Journal of Applied Physics, 2009, 106(2): 023534. DOI: 10.1063/1.3159655.
[18]	AO T, KNUDSON M D, ASAY J R, et al. Strength of lithium fluoride under shockless compression to 114 GPa [J]. Journal of Applied Physics, 2009, 106(10): 103507. DOI: 10.1063/1.3259387.
[19]	BROWN J L, ALEXANDER C S, ASAY J R, et al. Extracting strength from high pressure ramp-release experiments [J]. Journal of Applied Physics, 2013, 114(22): 223518. DOI: 10.1063/1.4847535.
[20]	谭华. 实验冲击波物理导引 [M]. 北京: 国防工业出版社, 2007: 186−192.
[21]	VOGLER T J, CHHABILDAS L C. Strength behavior of materials at high pressures [J]. International Journal of Impact Engineering, 2006, 33(1): 812–825. DOI: 10.1016/j.ijimpeng.2006.09.069.
[22]	HUANG H, ASAY J R. Compressive strength measurements in aluminum for shock compression over the stress range of 4−22 GPa [J]. Journal of Applied Physics, 2005, 98(3): 033524. DOI: 10.1063/1.2001729.
[23]	ASAY J R, CHHABILDAS L C. Determination of the shear strength of shock compressed 6061-T6 aluminum [M]//MEYERS M A, MURR L E. Shock Waves and High-Strain-Rate Phenomena in Metals. Boston, MA, USA: Springer, 1981: 417−431. DOI: 10.1007/978-1-4613-3219-0_26.
[24]	WENG J D, TAN H, HU S L, et al. New all-fiber velocimeter [J]. Review of Scientific Instruments, 2005, 76(9): 093301. DOI: 10.1063/1.2008989.
[25]	李雪梅, 俞宇颖, 李英华, 等. 冲击压缩下z-切石英的弹性响应特性和折射率 [J]. 物理学报, 2010, 59(4): 2691–2696. DOI: 10.7498/aps.59.2691. LI X M, YU Y Y, LI Y H, et al. Elastic properties and refractive index of shocked z-cut quartz [J]. Acta Physica Sinica, 2010, 59(4): 2691–2696. DOI: 10.7498/aps.59.2691.
[26]	MITCHELL A C, NELLIS W J. Shock compression of aluminum, copper, and tantalum [J]. Journal of Applied Physics, 1981, 52(5): 3363–3374. DOI: 10.1063/1.329160.