Properties of Mechanically Alloyed W-Ti Materials with Dual Phase Particle Dispersion

0474189 - ÚFP 2018 RIV CH eng J - Journal Article
Lukáč, František - Vilémová, Monika - Nevrlá, Barbara - Klečka, Jakub - Chráska, Tomáš - Molnárová, O.
Properties of Mechanically Alloyed W-Ti Materials with Dual Phase Particle Dispersion.
Metals. Roč. 7, č. 1 (2017), č. článku 3. E-ISSN 2075-4701
R&D Projects: GA ČR(CZ) GA15-15609S
Institutional support: RVO:61389021
Keywords : tungsten-titanium alloys * mechanical alloying * particle dispersion * pulsed electric current sintering * thermal conductivity * bending strength
OECD category: Materials engineering
Impact factor: 1.704, year: 2017

In the presented study, we report on the preparation and properties of mechanically alloyed W-Ti powders compacted by pulsed electric current sintering. Four different powder compositions of W-(3%–7%)Ti with Hf or HfC were prepared. The alloys structure contains only high-melting-point phases, namely the W-Ti matrix, complex carbide (Ti,W,Hf)C and HfO2 particle dispersion, Ti in the form of a separate phase is not present. The bending strength of the alloys depends on the amount of Ti added. The addition of 3 wt. % Ti led to an increase whereas 7 wt. % Ti led to a major decrease in strength when compared to unalloyed tungsten sintered at similar conditions. The addition of Ti significantly lowered the room-temperature thermal conductivity of all prepared materials. However, unlike pure tungsten, the conductivity of the prepared alloys increased with the temperature. Thus, the thermal conductivity of the alloys at 1300 °C approached the value of the unalloyed tungsten.
Permanent Link: http://hdl.handle.net/11104/0271299