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Adiabatic shear localization in titanium and Ti-6 pct Al-4 pct V alloy

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Abstract

Ballistic impact experiments were conducted on 12.5 mm thick commercial purity titanium and Ti-6 pct Al-4 pct V alloy plates using steel “stepped” projectiles with 10.5 mm diameter. The impact velocities varied between 578 m per second and 846 m per second, and a flash X-ray technique was used to determine projectile velocity and to assure the normality of impact. The microstructural damage mechanisms associated with impact (shear band formation, shock wave propagation, and dynamic fracture) were analyzed by optical, and scanning and transmission electron microscopy. Elliptical and spherical cavities were observed along the bands. Microindentation hardness differences between the bands and adjacent regions were slight for the targets; for the projectiles, the hardness in the band was significantly lower than that of surrounding regions. Observation of the fractured regions along the bands showed unique features indicating possible melting. Transmission-electron microscopy of a shear band in titanium revealed microcrystalline features (∼0.3 µm diameter) with poorly defined grain boundaries.

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Authors and Affiliations

  1. Tubemakers of South Africa Ltd. Pty., Box 1905, 1930, Vereeniging, South Africa

    H. Andrew Grebe (Works Metallurgist)

  2. Department of Metallurgical and Materials Engineering, USA

    Han-Ryong Pak (Assistant Professor)

  3. Center for Explosives Technology Research, New Mexico Institute of Mining and Technology, 87801, Socorro, NM

    Marc A. Meyers (Associate Director)

Authors
  1. H. Andrew Grebe
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  2. Han-Ryong Pak
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  3. Marc A. Meyers
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Formerly Graduate Student, Department of Metallurgical and Materials Engineering, New Mexico Institute of Mining and Technology, Socorro, NM 87801

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Grebe, H.A., Pak, HR. & Meyers, M.A. Adiabatic shear localization in titanium and Ti-6 pct Al-4 pct V alloy. Metall Trans A 16, 761–775 (1985). https://doi.org/10.1007/BF02814827

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