Roberts, Steve - University of Oxford - Department of Materials

研究领域

Mechanical behaviour of materials. Materials for nuclear (fusion & fission) power plants. Micromechanical testing. Brittle-ductile transitions. Studies aim at linking modelling at the defect and dislocation level with experimental studies of well-characterised materials.

近期论文

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Dislocation dynamic modelling of the brittle-ductile transition in tungsten, E Tarleton and S.G. Roberts, Phil. Mag. 89, 2009, 2759-2769; DOI: 10.1080/14786430902992619 Characterisation of plastic zones around crack-tips in pure single-crystal tungsten using electron backscatter diffraction, J D Murphy, A J Wilkinson and S G Roberts, Mat. Sci. & Eng. 3 (2009) 012015; DOI:10.1088/1757-899X/3/1/012015 Measuring anisotropy in Young’s modulus using micromechanical testing in single crystal Cu, D.E.J. Armstrong, A.J. Wilkinson and S.G. Roberts, J Mater Res, 24, 2009, 3268-76 DOI: 10.1557/JMR.2009.0396 3D DD modelling of the prismatic loops and dislocations interaction in pure iron, R.Novokshanov and S.G. Roberts: J. Nucl. Materials, 386,, 2009, 64-66. Micromechanical testing of stress corrosion cracking of individual grain boundaries, D.E.J. Armstrong, M. Rogers and S.G. Roberts, Scripta Mater., 61, 2009, 741-743; http://dx.doi.org/10.1016/j.scriptamat.2009.06.017 Measuring local mechanical properties using FIB machined cantilevers, D.E.J. Armstrong, A.J. Wilkinson, S.G. Roberts, in Probing Mechanics at Nanoscale Dimensions, edited by N. Tamura, A. Minor, C. Murray, L. Friedman (Mater. Res. Soc. Symp. Proc. 1185, Warrendale, PA, 2009), paper II-02-08. Effects of Y2O3 additives and powder purity on the densification and grain boundary composition of Al2O3/SiC nanocomposites I.P. Shapiro, R.I. Todd, J.M. Titchmarsh, S.G. Roberts, J. Euro Ceram. Soc,29, 2009, 1613-1624; http://dx.doi.org/10.1016/j.jeurceramsoc.2008.09.021 The mechanical properties of tungsten grown by chemical vapour deposition, J.D. Murphy, A. Giannattasio, Z. Yao, C.J.D. Hetherington, P.D. Nellist, S.G. Roberts, J. Nucl. Materials, 386, 2009, 583-586; doi:10.1016/j.jnucmat.2008.12.182 Nanoindentation and micromechanical testing of iron-chromium alloys implanted with iron ions, F.M. Halliday, D.E.J. Armstrong, J.D. Murphy and S.G. Roberts, Extremat meeting, San Sebastian, Advanced Materials Research, 59, 2009, 304-307. Brittle-to-ductile transition of poly-crystalline iron-chromium alloys, M. Tanaka, A.J. Wilkinson, S.G. Roberts, J. Nucl. Mater., 378, 2008, 305-311; http://dx.doi.org/10.1016/j.jnucmat.2008.06.039 Brittle-ductile transition in single-crystal iron, M. Tanaka, E. Tarleton, S. G. Roberts, Acta Mater.56, 2008, 5123-29; http://dx.doi.org/10.1016/j.actamat.2008.06.025 Residual stress distributions around indentations and scratches in polycrystalline Al2O3 and Al2O3/SiC nanocomposites measured using fluorescence probes, H.Z. Wu, S. G. Roberts and B. Derby, Acta Mater., 56, 2008, 140-149. Low-temperature fracture mechanisms in a spheroidised reactor pressure vessel steel, A. Kumar, S.G. Roberts and A. J. Wilkinson, Intl. J. Fracture, 144, 2007, 121-129. Quasi-cleavage fracture planes in spheroidised A533B steel, A. Kumar, A.J. Wilkinson and S.G. Roberts, J. Microsc, 227, 2007, 248–253 Brittle-ductile transitions in vanadium and iron-chromium, T.D. Joseph, M. Tanaka, A.J. Wilkinson and S.G. Roberts, J. Nucl. Mater., 367–370, 2007, 637–43. Micro-fracture testing of Ni-W microbeams produced by electrodeposition and FIB machining, D. Armstrong, A. Haseeb, A.J. Wilkinson, S.G. Roberts, in Focused Ion Beams for Analysis and Processing, edited by W. MoberlyChan, H. Colijn, R. Langford, A. Marshall (Mater. Res. Soc. Symp. Proc. 983E, Warrendale, PA, 2007), 0983-LL08-07. Strain-rate dependence of the brittle-to-ductile transition temperature in tungsten, A. Giannattasio and S. G. Roberts, Phil. Mag. 87, 2007, 2589-98.