Single-crystal Ni-based superalloys are currently the material of choice for turbine blade applications, especially with emerging additive manufacturing (AM) that facilitates manufacture/repair these single crystals. This promising AM route, however, comes a dilemma: in fusion and heat affected zones after e-beam or laser induced melting, one needs solutionizing annealing to relieve residual st...

Stray grains are the most severe of solidification defects that occur in industrial single-crystal blade preparation process. In this study, a dummy cluster with different crystal orientations controlled by seeding method was prepared, and influence position circular platform (relative to sample furnace body) on stray grain nucleation investigated. Results show microstructure platforms could be...

Since hydrogen-plasticity interaction is a key feature in the study of hydrogen embrittlement, series nanoindentation tests were carried out to evaluate possible impact on dislocation structures formed during cyclic pre-straining nickel single crystal. Ex-situ and in-situ electrochemical performed cyclically pre-strained crystal nickel-hydrogen systems characterise change reduced modulus hardne...

in this research, graphitization transformation of a commercial hypereutectoid steel called ck100 was studied by the dilatometric experiments at the range of 600 – 700 °c from prior martensitic structure. also the effect of quenching media on the initial graphitization time and completion of transformation has been discussed. also, graphitization transition from the different prior microstructu...

The unusual properties of many multifunctional materials originate from a structural phase transformation and consequent martensitic microstructure. Phase-field models are typically used to predict the formation of microstructural patterns and subsequent evolution under applied loads. However, formulating a phase-field energy with the correct equilibrium crystal structures and that also respect...

This research is focused on the development of a microstructural model for phase transformation kinetics in shockwaves. It is assumed that the Hugoniot state lies in the region of metastability around an equilibrium solid-solidphase boundary, hence this model applies to transformations occurring through nucleation and growth. The modelaccounts for both homogeneous (thermally dri...

1. The photonic-crystal fibres In conventional optical fibres, electromagnetic modes are guided by a phenomenon of total internal reflection on a core-cladding border. The core refractive index is higher than the refractive index of a cladding which is achieved by adequate doping of a central part of the based material [1]. After over 20 years of intense researches on optical fibres, including ...

The effects of crystal-plasticity on the U-Th-Pb system in zircon is studied by quantitative microstructural and microchemical analysis of a large zircon grain collected from pyroxenite of the Lewisian Complex, Scotland. Electron backscatter diffraction (EBSD) mapping reveals a c.18 degree variation in crystallographic orientation that comprises both a gradual change in orientation and a series...

Ice growth has attracted great attention for its capability of fabricating hierarchically porous microstructure. However, the formation tilted lamellar microstructure during freezing needs to be reconsidered due limited control ice orientation with respect thermal gradient in situ observations, which can greatly enrich our insight into architectural biomaterials. This paper provides an study so...

Abstract The effects of heat treatment at various temperatures on mechanically separated bamboo fibers and parenchyma cells were examined in terms color, microstructure, chemical composition, crystallinity, thermal properties. heat-treated characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), composition analysis, thermogravimetric analysis (TGA). ...