## 1 Introduction
THAs feature exceptional mechanical and physical properties, among which are, e.g., high density (17-19 g/cm\({}^{3}\)) and high strength (up to 1900 MPa after optimized deformation processing) [16; 17]. They are typically used for radiation shielding, as therapeutic devices in oncology, or as kinetic energy penetrators [8; 18]. THAs are usually fabricated via methods of powder metallurgy [19]. The mixed powders are isostatically pressed under a protective atmosphere (H\({}_{2}\), Ar\({}_{2}\), vacuum) and sintered within the temperature range from 1000 \({}^{\circ}\)C to 1550 \({}^{\circ}\)C [16; 20]. The powder mixture typically consists of more than 90 wt. % of tungsten plus a mixture of other elements with lower melting temperatures (Ni, Co, Fe). Within the mixtures, the grain boundaries of the elements featuring lower melting temperatures locally melt during sintering, and consequently form a matrix binding the agglomerated tungsten particles together [18; 21]. The alloying elements thus provide the plasticity of the final material, whereas tungsten primarily increases the ultimate tensile strength (UTS). Based on the aforementioned, the optimum combination of strength/plasticity for THAs can be achieved by optimizing the chemical composition and sintering conditions. Nevertheless, the deformation processing performed after sintering can also non-negligibly affect the performance of the final product [16; 22]. Intensive deformation processing contributing to the structure refinement and enhancement of the final properties can advantageously be performed via the severe plastic deformation (SPD) methods [23], such as equal channel angular pressing (ECAP) [24; 25; 26], twist channel (multi) angular pressing (TCAP, TCMAP) [27; 28], ECAP with (partial) back pressure (ECAP-BP, ECAP-PBP) [29; 30], high pressure torsion (HPT) [31; 32], etc. These processes are discontinuous and can only be used to process samples of limited dimensions. On the other hand, continuous methods of intensive plastic deformation, such as ECAP-Conform [33], accumulative roll bonding (ARB) [34] or rotary swaging (RS) [35], can be used to process long axisymmetric workpieces and, moreover, are industrially applicable. RS is used to gradually reduce the cross-sections of workpieces and increase their lengths via the repeated action of the swaging dies [36]. It induces changes in the shapes and dimensions of the workpieces, and is thus favorable for the production of final products featuring the required shapes. RS can be performed under cold, warm, and hot conditions to process various materials, including challenging ones, such as powder-based alloys, laminated materials, biomaterials, or composites [37; 38; 39; 40; 41]. The aim of the study is to design an optimized induction process applicable in the process of the manufacturing of high-quality billets from pre-sintered WNiCo pseudoalloys consisting of a consequent combination of induction heating and rotary swaging. The first part of the study focuses on the characterization of the induction heating process, including a brief description of the electromagnetic parameters within the inductor and workpiece, and the design of the optimum induction heating model. For these purposes, numerical modeling using two individual 2D and 3D software packages was performed. The second part of the study then deals with the 3D numerical analysis performed with the aim of proposing suitable induction heating parameters and a deformation temperature for rotary swaging of the particular WNiCo alloy. Finally, the experimental realization of the induction heating and subsequent warm rotary swaging of the sintered workpieces is performed and the experimental results are discussed together with the predicted ones.