利用激光皮秒超声技术测量高压下钨的弹性性质  

Investigation of Elastic Properties of Tungsten Under High Pressure Using Picosecond Laser Ultrasonics

作　　者：张金强 徐钰山 张鑫泽 黄海军[1] 徐丰 ZHANG Jin-qiang;XU Yu-shan;ZHANG Xin-ze;HUANG Hai-jun;XU Feng(School of Sciences,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学理学院,武汉430070

出　　处：《武汉理工大学学报》2023年第8期8-14,共7页Journal of Wuhan University of Technology

基　　金：装备预先研究领域基金(ZBYY-80922010601).

摘　　要：金属钨以高熔点和高硬度而闻名,但关于其在超高压加载下的弹性性质研究却十分有限。结合激光皮秒超声技术和金刚石压砧技术,测量了钨从常压至46GPa压强范围内的纵波声速(V_(L))。在实验压强范围内,V_(L)随压强的升高而稳定增加,其压强依赖性满足斜率为∂V_(L)/∂P≈(0.020±0.001)km/(s·GPa)的线性关系,当压强为46GPa时,VL=(6.21±0.08)km/s。利用已知的状态方程ρ(P),还获得了钨的剪切模量(G)和横波声速(V_(T))随压强的关系。结果表明,G(P)和V_(T)(P)均随着压强的升高而持续增加,当压强为46GPa时,G=(268±10)GPa,V_(T)=(3.51±0.07)km/s。Tungsten is known for its high melting point and hardness but the knowledge on its elasticity at very high pressures is limited.Here,the longitudinal sound velocity,V_(L),of tungsten compressed in a diamond anvil cell to P=46GPa was measured using the technique of picosecond laser ultrasonics.Our results demonstrate that the VLincreases linearly with increasing pressure with a slope of ∂V_(L)/∂P≈(0.020±0.001)km/(s·GPa)and reaches(6.21±0.01)km/s at P=46GPa.Applying previously published equations of state,ρ(P),the pressure-dependent shear modulus,G(P),and transversal sound velocity,V_(T)(P),of tungsten are also derived.The results show that both parameters increase continuously with increasing pressure,and reach(268±10)GPa for the Gand(3.51±0.07)km/s for the V_(T),at P=46GPa.

关 键 词：激光皮秒超声 高压 钨 纵波声速 剪切模量 金刚石压砧 

分 类 号：TB332[一般工业技术—材料科学与工程]