NRN046 Formation and Disruption of W-Phase in High-Entropy Alloys
High-entropy alloys (HEAs) are single-phase systems prepared from equimolar or near-equimolar concentrations of at least five principal elements. The combination of high mixing entropy, severe lattice distortion, sluggish diffusion and cocktail effect favours the formation of simple phases—usually a bcc or fcc matrix with minor inclusions of ordered binary intermetallics.
NRN046 The Scandium Effect in Multicomponent Alloys
International Materials Review
This review aims to summarise advances in scandium metallurgical research over the last decade. The use of scandium as a conventional minor addition to alloys, largely in structural applications, is described. Also, more futuristic functional applications are discussed where details of crystal structures and peculiar symmetries are often of major importance. This review also includes data obtained from more obscure sources (especially Russian publications) which are much less accessible to the wider community.
NRN113 - Large Area Formation of Microsphere Arrays Using Laser Surface Texturing Technology
Many potential applications in optics and nanotechnology require arrays of spherical particles with dozens of microns diameter, but it is not easy to format microspheres in this scale using existing technologies, especially for large-area application. In this paper, we report that microspheres sized from 40 to 80 μm can be regularly arranged in arrays with the aid of micro-ridges generated by pulsed nanosecond laser texturing. After experimental comparison, it is known that final formation of microspheres is significantly related to the height and width of micro-ridges. Proposed particle arrangement technology does not have area limitation and harsh hardware requirement, simultaneously possessing low-cost and time-saving advantages.
NRN140 - In operando Synchrotron XRD/XAS Investigation of Sodium Insertion into the Prussian Blue Analogue Cathode Material Na1.32Mn[Fe(CN)6]0.83·z H2O
Prussian Blue Analogues (PBAs) with general formula NaxMA[MB(CN)6]y·z H2O (MA, MB = transition metal) are promising low cost, high rate and high capacity cathodes for sodium ion battery (SIB) technology. Here, we have studied the PBA Na1.32Mn[Fe(CN)6]0.83·z H2O (z = 3.0 and 2.2) with varying structural modifications (monoclinic and cubic) using in operando quasi-simultaneous X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS). We observed a series of reversible structural phase transitions which accompany Na insertion/extraction during electrochemical cycling. The samples show pronounced differences in their galvanostatic charge and discharge profiles which could be linked to structural and electronic response. Different desodiation and sodiation mechanisms were identified. The influence of [Fe(CN)6] vacancies and water content on the electrochemical performance was investigated
NRNC28 An Extended Harmonic Balance Method Based on Incremental Nonlinear Control Parameters
Mechanical Systems and Signal Processing
A new formulation for calculating the steady-state responses of multiple-degree-of-freedom (MDOF) non-linear dynamic systems due to harmonic excitation is developed. This is aimed at solving multi-dimensional nonlinear systems using linear equations.
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