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Microstructural Analysis of Sintered Gradient Materials Based on Distaloy SE Powder

Zarębski K., Nykiel M.

Archives of Metallurgy and Materials

2016

Vol. 61, iss. 2A

613--620

The study describes the microstructural analysis of cylindrically-shaped functionally graded products sintered from iron powder with scheduled graded structure on the cross-section running from the core to the surface layer of the sinter. Different types of structure were produced using Distaloy SE powder in two compositions - one without the addition of carbon, and another with 0.6wt% C. Two methods were used to fill the die cavity and shape the products. The first method involving a two-step compaction of individual layers. The second method using an original technique of die filling enabled the formation of transition zone between the outer layer and the core still at the stage of product shaping. As part of microstructural analysis, structural constituents were identified and voids morphology was examined. Studies covered the effect of the type of the applied method on properties of the graded zone obtained in the manufactured products.

Applications of functionally graded materials in optoelectronic devices

Wośko M., Paszkiewicz B., Piasecki T., Szyszka A., Paszkiewicz R., Tłaczała M.

Optica Applicata

2005

Vol. 35, nr 3

663-667

Up to now research on functionally graded materials (FGM) was focused on their mechanical and strength properties. The paper presents a review of possible applications of AIII-BV group materials with graded composition for optoelectronic devices, such as p-i-n diodes, heterojunction photodetectors and lasers. Nowadays, there are no optoelectronic devices fabricated from FGM. The theoretical simulation showed that devices with FGM active region would have superior characteristics compared with classical constructions.