This article introduces a simple new method for extracting the electron backscattering coefficients of phases present in the microstructure, from the backscattered electron micrographs. This method is able to convert the micrograph’s greyscale to the backscattering-coefficient-scale.
COBISS.SI-ID: 14470422
The shapes of icosahedral quasicrystalline (IQC) particles in Al-Mn-Be-(Cu) alloys were determined in samples subjected to very wide range of cooling rates: from around 106 K/s in very thin melt-spun ribbons down to below 100 K/s in permanent copper dies. The evolution of quasicrystalline shapes from apparently spherical particles to very large and highly branched dendrites is systematically presented.
COBISS.SI-ID: 14743830
On the basis of a training data set, various different genetic models for flow curve distribution were developed during simulated evolution. The accuracies of the best models were proved by a testing data set and comparing between the genetic and deterministic methods (linear regression models). The research showed that very accurate genetic models can be developed by the proposed approach.
COBISS.SI-ID: 13956118
In the paper formability of a cold forward extruded specimen of copper alloy as a function of the stress field was analyzed. The stress field and effective strain were obtained by the visioplasticity method in several points of the extruded material. These data make possible to determinate regions in extruded material where the possibility of cracks is the greatest. With known values of the stress components it is possible to calculate the indicator of the state of stresses ? in the individual points of the extruded specimen by means of equation.
COBISS.SI-ID: 14201622
Numerical simulation of micro-crack initiation that is based on improved Tanaka-Mura micro-crack nucleation model is presented. Numerical simulation of crack-initiation was performed with ABAQUS, using a plug-in that was written specially for handling micro-crack nucleation and coalescence. Since numerical model was directed at simulating fatigue properties of thermally cut steel with martensitic microstructure, edge properties of specimen were additionally inspected in terms of micro-structural properties, surface roughness and residual stresses.
COBISS.SI-ID: 13864726