Sound Velocities in Vanadium Reveal Complex Elastic Behavior at High Pressures

2025

Metals, Vol 15, Iss 4, p 427 (2025)

Compressional (VP) and shear (VS) wave velocities of polycrystalline vanadium were measured simultaneously up to 11.5 GPa at room temperature using ultrasonic interferometry in a multi-anvil press. Complex softening behavior in VS and resulting shear moduli are discovered, possibly revealing a precursor to the reported phase transition within 30–60 GPa. The current data enables a comprehensive assessment of the elastic and mechanical properties of vanadium at high pressures, including bulk and shear moduli, Young’s modulus, Poisson’s ratio, and Pugh’s ratio. Through fitting to the 3rd-order finite strain equations, the elastic moduli and their pressure derivatives were determined to be KS0 = 151 (2) GPa, G0 = 46.9 (8) GPa, K’S0 = 3.47 (5), and G’0 = 0.62 (1). These experimental results allow us to compare with and benchmark the existing Steinberg–Guinan models for extrapolations to extreme pressure and temperature conditions.

article

English

MDPI AG, 2025.

high pressure, equation of state, vanadium, multi-anvil press, ultrasonic, sound velocity, Mining engineering. Metallurgy, TN1-997