Abstract

A new reactive fine-grained tungsten heavy alloy (RF-WHA) with self-sharpening ability was developed, which is a high-density and -strength material for armor-piercing projectiles with excellent penetration performance and reactive energy-releasing properties. This paper introduces the preparation method, microstructure and mechanical properties of the RF-WHA. Comparative experiments were conducted between RF-WHA and the conventional tungsten heavy alloy (WHA) long rod penetrating semi-infinite medium‑carbon steel target at impact velocities ranging from 1000 m/s to 1700 m/s using a 25 mm ballistic gun. The depth of penetration (DOP), crater channels and residual rods of the RF-WHA and WHA at different velocities were obtained. The experiment results show that the RF-WHA rod has reactive energy-releasing properties, and the DOP of the RF-WHA rod is 10%–15% higher than that of the WHA rod. The RF-WHA rod has an excellent self-sharpening behavior during penetrating. The failure mode of the RF-WHA rod was described by systematically analyzing the macroscopic morphological and microscopic metallurgical of crater channels and residual rods. It is noted that the self-sharpening behavior is related to the adiabatic shear sensitivity and brittle behavior of the RF-WHA under high and medium strain rate loading.

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