Elastic wave velocities of polycrystalline tantalum have been measured up to 13.6 GPa at room temperature using ultrasonic interferometry technique in a multi-anvil apparatus. The bulk and shear moduli, as well as their pressure derivatives are obtained using Eulerian 3rd order finite strain equations, yielding K_S0 = 193.9(29) GPa, G₀ = 69.3(10) GPa, K_S0′ = 3.18(5) and G₀′ = 0.88(1). The Steinberg-Guinan yield stress model is examined using the current shear modulus and its pressure derivative, where a slightly lower A₀ = 0.0127 GPa⁻¹ compared to previous studies is obtained. First-principles calculations on the elasticity of tantalum have also been performed up to 200 GPa. Anomalous softening of the elastic shear constant C₄₄ and shear wave velocity V_S is observed between 80– 180 GPa, whereas the anisotropy shows a softening-stiffening behavior with increasing pressure and reaches a minimum at around 150 GPa. Such anomalies might commonly originate from the nesting of Fermi surface for Group VB metals.

多晶钽的弹性波速度已在室温下使用超声干涉技术在多砧装置中测量到高达 13.6 GPa。体积和剪切模量，以及它们的压力导数是使用欧拉三阶有限应变方程获得的，产生K _{S 0} = 193.9(29) GPa, G ₀ = 69.3(10) GPa, K _{S 0} ′ = 3.18(5 ) 和G ₀ ′ = 0.88(1)。使用当前剪切模量及其压力导数检查 Steinberg-Guinan 屈服应力模型，其中略低的A ₀ = 0.0127 GPa ^-1与以往的研究相比。钽的弹性的第一性原理计算也已进行到 200 GPa。在 80-180 GPa 之间观察到弹性剪切常数C ₄₄和剪切波速度V _{S 的}异常软化，而各向异性随着压力的增加表现出软化-硬化行为，并在 150 GPa 左右达到最小值。这种异常可能通常源于 VB 族金属的费米表面嵌套。