Details

Autor(en) / Beteiligte

• Romaner, Lorenz
• Ambrosch-Draxl, Claudia
• Pippan, Reinhard

Titel

Effect of rhenium on the dislocation core structure in tungsten

Ist Teil von

• Physical review letters, 2010-05, Vol.104 (19), p.195503-195503, Article 195503

Ort / Verlag

United States

Erscheinungsjahr

2010

Quelle

American Physical Society

Beschreibungen/Notizen

• Despite exhibiting the highest melting point of all metals, the technological use of tungsten is hampered by its room-temperature brittleness. Alloying with Re significantly ductilizes the material which has been assigned to modified properties of the 1/2(111) screw dislocation. Using density functional theory, we show that alloying induces a transition from a symmetric to an asymmetric core and a reduction in Peierls stress. This combination ductilizes the alloy as the number of available slip planes is increased and the critical stress needed to start plastic deformation is lowered.