Solution softening mechanism of iridium and rhenium in tungsten at room temperature

Luo, Anhua; Jacobson, D. L.; Shin, Kwang Seon

doi:10.1016/0263-4368(91)90028-m

Cited by 77 publications

(26 citation statements)

References 10 publications

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“…Iridium too is sometimes mentioned in literature as having a similar effect [21], though it is even more expensive. This leaves only tantalum, vanadium, molybdenum, and titanium which also form solid solution with tungsten (Cr is excluded from this list since W-Cr alloys are known for their brittleness).…”

Section: Ductilisationmentioning

confidence: 99%

Recent progress in research on tungsten materials for nuclear fusion applications in Europe

Rieth

Dudarev

Vicente³

et al. 2013

Journal of Nuclear Materials

650

281

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Section: Ductilisationmentioning

confidence: 99%

Recent progress in research on tungsten materials for nuclear fusion applications in Europe

Rieth

Dudarev

Vicente³

et al. 2013

Journal of Nuclear Materials

650

281

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“…The reduction of Peierls stress/barrier due to alloying with transition metals with a higher number of valence electrons and the increase for lower number of valence electrons is supported by existing experimental data. Hardening was observed in W-Zr alloys [54] and softening in W-Re/Ir alloys [8]. Very interesting experimental results for Mo alloys with group VIIIA 3d transition metals were presented by Hiraoka et al [13].…”

Section: B Elastic Constantsmentioning

confidence: 99%

The influence of transition metal solutes on the dislocation core structure and values of the Peierls stress and barrier in tungsten

Samolyuk

Osetsky

Stoller

2012

J. Phys.: Condens. Matter

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Several transition metals were examined to evaluate their potential for improving the ductility of tungsten. The dislocation core structure and Peierls stress and barrier of 1/2<111> screw dislocations in binary tungsten-transition metal alloys (W(1-x)TM(x)) were investigated using density functional theory calculations. The periodic quadrupole approach was applied to model the structure of the 1/2<111> dislocation. Alloying with transition metals was modeled using the virtual crystal approximation and the applicability of this approach was assessed by calculating the equilibrium lattice parameter and elastic constants of the tungsten alloys. Reasonable agreement was obtained with experimental data and with results obtained from the conventional supercell approach. Increasing the concentration of a transition metal from the VIIIA group, i.e. the elements in columns headed by Fe, Co and Ni, leads to reduction of the C' elastic constant and increase of the elastic anisotropy A = C(44)/C'. Alloying W with a group VIIIA transition metal changes the structure of the dislocation core from symmetric to asymmetric, similarly to results obtained for W(1-x)Re(x) alloys in the earlier work of Romaner et al (2010 Phys. Rev. Lett. 104 195503). In addition to a change in the core symmetry, the values of the Peierls stress and barrier are reduced. The latter effect could lead to increased ductility in a tungsten-based alloy. Our results demonstrate that alloying with any of the transition metals from the VIIIA group should have a similar effect to alloying with Re.

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“…Using density functional theory (DFT), they showed that alloying with rhenium induces a transition of the core of the ½<111> screw dislocation from symmetric to asymmetric, which reduces the Peierls stress. Investigations of alloying tungsten with other elements rather than rhenium can be found in Luo et al (iridium (Ir)) [5] and Rieth et al (tantalum (Ta) and vanadium (V)) [6]. The work by Rieth et al shows that alloying tungsten with tantalum or vanadium does not lead to improved Charpy impact properties.…”

Section: Introductionmentioning

confidence: 96%

Ductilisation of tungsten (W) through cold-rolling: R-curve behaviour

Reiser

Wurster

Hoffmann

et al. 2016

International Journal of Refractory Metals and Hard Materials

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Solution softening mechanism of iridium and rhenium in tungsten at room temperature

Cited by 77 publications

References 10 publications

Recent progress in research on tungsten materials for nuclear fusion applications in Europe

Recent progress in research on tungsten materials for nuclear fusion applications in Europe

The influence of transition metal solutes on the dislocation core structure and values of the Peierls stress and barrier in tungsten

Ductilisation of tungsten (W) through cold-rolling: R-curve behaviour

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