G.G. Goviazin , V. Tannieres , R. Cury , D. Rittel
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The Taylor-Quinney coefficient of tungsten-base heavy alloys
Tungsten heavy alloys (WHAs) have been widely investigated due to their high density and strength, thus making them suitable candidates for defense applications, especially those involving high strain rates, such as Kinetic Energy Penetrators (KEP) for armour-piercing fin-stabilized discarding sabot (APFSDS) ammunition. Besides their mechanical properties, the extent of the thermomechanical coupling, i.e., the Taylor-Quinney coefficient (TQC), is relevant for producing accurate numerical models of high strain rate configurations. However, the TQC of WHAs has not been investigated yet.
Four different WHA prototypes were evaluated. Changing the content of tungsten from 70 to 92.5 wt% had little effect on the TQC which had an average value of 0.24. Those low TQC values are accompanied by a significant strain-rate sensitivity with minimal strain hardening. Throughout the tests, dynamic shear localization was not observed.
期刊介绍：
The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.
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