P. L. Raffo and J. , Less-Common Met, p.133, 1969.

A. Wronski and A. Fourdeux, Slip-induced cleavage in polycrystalline tungsten, Journal of the Less Common Metals, vol.6, issue.6, p.413, 1964.
DOI : 10.1016/0022-5088(64)90086-4

G. L. Davis, Embrittlement of Tungsten Wires by Contaminants, Nature, vol.5, issue.4617, p.1198, 1958.
DOI : 10.1038/1811198a0

P. J. Burdon and G. L. Davis, Embrittlement of Tungsten and of Molybdenum, Nature, vol.57, issue.4711, p.455, 1960.
DOI : 10.1038/185455a0

A. W. Funkenbusch, F. Bacon, and D. Lee, The influence of microstructure on fracture of drawn tungsten wire, Metallurgical Transactions A, vol.46, issue.8, p.1085, 1979.
DOI : 10.1007/BF02811654

J. P. Tran-huu-loi, M. Morniroli, M. Gantois, and . Lahaye, Brittle fracture of polycrystalline tungsten, Journal of Materials Science, vol.28, issue.1, p.199, 1985.
DOI : 10.1007/BF00555913

A. Vorhauer and R. Pippan, On the homogeneity of deformation by high pressure torsion, Scripta Materialia, vol.51, issue.9, p.921, 2004.
DOI : 10.1016/j.scriptamat.2004.04.025

A. P. Zhilyaev and T. G. Langdon, Using high-pressure torsion for metal processing: Fundamentals and applications, Progress in Materials Science, vol.53, issue.6, p.893, 2008.
DOI : 10.1016/j.pmatsci.2008.03.002

A. Hohenwarter and R. Pippan, Anisotropic fracture behavior of ultrafine-grained iron, Materials Science and Engineering: A, vol.527, issue.10-11, p.2649, 2010.
DOI : 10.1016/j.msea.2009.12.033

R. W. Margevicius, J. Riedle, and P. Gumbsch, Fracture toughness of polycrystalline tungsten under mode I and mixed mode I/II loading, Materials Science and Engineering: A, vol.270, issue.2, p.197, 1999.
DOI : 10.1016/S0921-5093(99)00252-X

B. Predel, Landolt-Börnstein -Numerical Data and Functional Relationships in Science and Technology ; Group IV: Physical Chemistry; Thermodynamic Properties -Phase Equilibria, Crystallographic and Thermodynamic Data of Binary Alloys, 1998.

R. Pippan, The crack driving force for fatigue crack propagation, Engineering Fracture Mechanics, vol.44, issue.5, pp.821-831, 1993.
DOI : 10.1016/0013-7944(93)90208-A