Correlating Microstrain and Activated Slip Systems with Mechanical Properties within Rotary Swaged WNiCo Pseudoalloy

0523499 - ÚJF 2021 RIV CH eng J - Journal Article
Strunz, Pavel - Kunčická, L. - Beran, Přemysl - Kocich, R. - Hervoches, Charles
Correlating Microstrain and Activated Slip Systems with Mechanical Properties within Rotary Swaged WNiCo Pseudoalloy.
Materials. Roč. 13, č. 1 (2020), č. článku 208. E-ISSN 1996-1944
R&D Projects: GA ČR(CZ) GA19-15479S; GA MŠMT LM2015056; GA MŠMT EF16_013/0001812
Research Infrastructure: Reactors LVR-15 and LR-0 II - 90120
Institutional support: RVO:61389005
Keywords : tungsten * rotary swaging * neutron diffraction * dislocations * microstrain
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.623, year: 2020
Method of publishing: Open access
https://doi.org/10.3390/ma13010208

Due to their superb mechanical properties and high specific mass, tungsten heavy alloys are used in demanding applications, such as kinetic penetrators, gyroscope rotors, or radiation shielding. However, their structure, consisting of hard tungsten particles embedded in a soft matrix, makes the deformation processing a challenging task. This study focused on the characterization of deformation behavior during thermomechanical processing of a WNiCo tungsten heavy alloy (THA) via the method of rotary swaging at various temperatures. Emphasis is given to microstrain development and determination of the activated slip systems and dislocation density via neutron diffraction. The analyses showed that the grains of the NiCo2W matrix refined significantly after the deformation treatments. The microstrain was higher in the cold swaged sample (44.2 x 10(-4)). Both the samples swaged at 20 degrees C and 900 degrees C exhibited the activation of edge dislocations with 111 {110} or 110 {111} slip systems, and/or screw dislocations with 110 slip system in the NiCo2W matrix. Dislocation densities were determined and the results were correlated with the final mechanical properties of the swaged bars.
Permanent Link: http://hdl.handle.net/11104/0308022