3D printing provides a novel approach to fabricate bulk metallic glass components without limitations in size and geometry. However, defects (porosity partial crystallization) are inevitable, which detrimental mechanical properties. The present work shows that by careful control of these 3D-printed BMG (Zr60.14Cu22.31Fe4.85Al9.7Ag3), promising combination high strength (1.8 GPa), fairly good pl...

This review is a simplified summary of the thermodynamic dislocation theory, with special emphasis on role an effective temperature. Materials scientists, for decades, have asserted that statistical thermodynamics not applicable to dislocations. By use simple, first-principles analyses and comparisons experimental data, I argue these scientists been wrong, this venerable field urgently needs be...

Long-chained surfactant solutions have found widespread use in the oil and gas industry due to a host of attractive properties. In this paper, we characterize one such commercially used viscoelastic that forms wormlike micellar gel at room temperature solution higher temperatures. We probe both states by conducting linear nonlinear rheological tests analyze their behavior under framework rheolo...

The emergence of size-dependent mechanical strength in nanosized materials is now well-established, but no fundamental understanding of fracture toughness or flaw sensitivity in nanostructures exists. We report the fabrication and in situ fracture testing of ∼70 nm diameter Ni-P metallic glass samples with a structural flaw. Failure occurs at the structural flaw in all cases, and the failure st...

An 80-year-old woman presented with neck pain and paraparesis of Frankel C in her upper and lower extremities after falling. Imaging revealed an ankylosing cervical spine and a fracture line running obliquely from the anterior C3-4 to the posterior C4-5 level. Posterior fixation from the occi pit to T3 was performed using the RRS Loop Spine System and concomitant polyethylene tape fixation. Thi...

The orientation dependence of Charpy toughness has been investigated in API-X80 linepipe steel. The occurrence of delamination and preferential alignment of {100} cleavage planes are found to contribute to the observed anisotropy in Charpy properties. Delamination is also related to the presence of banding in the hot–rolled alloy, and the additional plasticity it entails during the process of f...

Using self-designed particle visualization instrumentation, startup shear and step strain tests were conducted under a series of systematically varied rheological and geometrical conditions, and the velocity profiles of three different well-entangled polybutadiene/oligomer solutions were obtained. For startup shear tests, in the regime of entanglement densities up to 89 and Weissenberg numbers ...

Edge fracture is a viscoelastic instability characterized by the sudden indentation of fluid’s free surface when fluid subjected to high enough shear rate. During rheometry, can invade sample, decreasing its contact area with rheometer fixture and rendering measurement viscosity normal stresses at high-shear rates invalid. also induce apparent banding in fluid, complicating interpretation exper...

Abstract Oxide glass, one of the most transformative materials in modern world, breaks easily under load due to its brittleness. Using classical molecular dynamics simulations, we prepared amorphous alumina by consolidating glass nanoparticles at room temperature. We showed that consolidated exhibits work hardening ability, hence deforms homogeneously and fractures via necking tension, while ob...

In the present work, Nbx-CoCrFeMnNi high entropy alloy films (HEAFs, 0 to 7.2 at.% Nb) were fabricated by radio frequency (RF) magnetron co-sputtering of CoCrFeMnNi and Nb targets. The effects addition on microstructures mechanical properties HEAFs systematically investigated. For Nb-free film (0 Nb), face-centered cubic (FCC) peaks identified in X-ray diffraction (XRD) pattern. resulted a broa...