Showing papers by "Tanguy Rouxel published in 2006"
TL;DR: In this paper, a careful modelling of a Vickers indentation process, accounting for a newly determined pressure-densification constitutive law, allows for a quantitative estimation of the contribution of densification to the indentation strain.
72 citations
TL;DR: In this article, the authors demonstrate the embrittlement of a Zr-based bulk metallic glass caused by the presence of very low oxygen traces during its synthesis and show that these defects embrittle the glass, and that careful attention must be paid during synthesis with respect to the oxygen content to get a completely glassy alloy.
Abstract: This paper demonstrates the embrittlement of a Zr-based bulk metallic glass caused by the presence of very low oxygen traces during its synthesis. Toughness studies are conducted both at room and low (77 K) temperatures. Samples with 2000 appm of oxygen contain crystalline defects (trapping all oxygen) while those with 300 appm are completely glassy. Toughness results clearly indicate that these defects embrittle the glass. Therefore, careful attention must be paid during synthesis with respect to the oxygen content to get a completely glassy alloy. This issue is of paramount importance when dealing with mechanical properties such as toughness.
51 citations
TL;DR: In this article, Rouxel et al. showed that Young's modulus E and Poisson's ratio ν are strongly correlated with the packing density and the glass network dimensionality, with maximum values observed for metallic glasses (λ ∼ 0.4 and C g > 0.7 ).
46 citations
TL;DR: In this paper, the viscoelastic behavior of a soda-lime silica glass (a standard window glass) was investigated by means of Vickers indentation from room temperature to 833 K.
Abstract: The viscoelastic behavior of a soda-lime silica glass (a standard window glass) was investigated by means of Vickers indentation from room temperature to 833 K. Hardness values decrease gradually from 293 to 673 K and drop rapidly above 673 K. The flow kinetics of the glass at high temperature was analyzed in the light of atomic force microscopy observations. It was observed that densification significantly contributes to the permanent deformation at low temperatures, whereas volume conservative flow played a more and more important role as temperature was increased. Master curves of the relaxation modulus and the creep compliance were obtained from constant-rate and constant-load indentation experiments, respectively. A major finding was that the viscous flow process is nonlinear, with a sharp decrease of the apparent viscosity as the mean contact pressure increases.
37 citations