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Effect of impact energy on the formation of nanocrystalline powders in Cu- 50 % Fe immiscible alloy system

Vaezi M.R., Mir Shah Ghassemi S.H., Shokuhfar A.

Materials Science Poland

2008

Vol. 26, No. 3

602--608

The study of mechanical alloying in the Cu–Fe system, as a model system for those with positive heats of mixing, has been investigated. The effects of impact force which pertains to ball-to-powder ratio, rotation speed and milling time, on the strain and grain size of final powders have been studied. The aim of this research was to find the optimum condition for mechanical alloying of Cu–Fe system by the automatic design and analysis of Taguchi experiments. X-ray diffraction (XRD) was used to analyze the effect of incoming energy on the diffusion rate.

Optimisation of carbon fibres made from commercial polyacrylonitrile fibres using the screening design method

Farsani R. E., Raissi S., Shokuhfar A., Sedghi A.

Materials Science Poland

2007

Vol. 25, No. 1

113--120

Stabilization and carbonisation conditions are the main factors influencing the properties of carbon fibres manufactured from polyacrylonitrile (PAN) fibres. In this report, low-cost commercial PAN fibres (textile grade) were used as precursors and the effects of the two mentioned factors on the tensile strength of carbon fibres were evaluated. By using the well-known Plackett-Burman screening method in the design of experiments, the best conditions to produce an economical product were determined. The results showed that this method can improve carbon fibre tensile strength by more than 15.7%.