Alien Registration- Meskinis, John (Baldwin, Cumberland County)

https://digitalmaine.com/alien_docs/32993/thumbnail.jp

Tribological properties and wear mechanisms of DC pulse plasma nitrided austenitic stainless steel in dry reciprocating sliding tests

Expanded austenite (Gamma-N), or S-phase, is a special phase of low-temperature nitrided austenite containing highly super-saturated nitrogen in the form of heterogeneous Cr-N nano-clusters. A nitrided layer of singe phase N is known to provide austenitic stainless steel with combined high hardness, good wear resistance and superior corrosion resistance. This paper reports recent experiments on a comparative study of the sliding wear properties and wear mechanisms of nitrided austenite stainless steel AISI 316, with a special attention paid on worn surface structural evolutions induced by frictional heating and sliding deformation. The samples were prepared by DC pulsed plasma nitriding treatments of various time at a fixed power. Knoop micro-indentation has revealed hardening behaviour of the nitrided samples. The reciprocating ball-on-disc sliding wear and friction properties were investigated at ambient environment conditions using an alumina counterpart ball. The worn surfaces have been analysed by XRD,FEG-SEM and EDX to show wear induced changes in the crystalline characteristics and the wear mechanisms of tribo-oxidation, cracking, abrasive wear and ploughing deformation. Moreover, longitudinal cross-sectional foils of the worn samples have been prepared and analysed using TEM, to investigate the wear induced structural changes, including tribofilm formation, plastic deformation and delamination in depths of nano-scale

Alien Registration- Meskinis, Lucy (Auburn, Androscoggin County)

https://digitalmaine.com/alien_docs/22660/thumbnail.jp

Alien Registration- Meskinis, Lucy (Auburn, Androscoggin County)

https://digitalmaine.com/alien_docs/22660/thumbnail.jp

Alien Registration- Meskinis, John (Baldwin, Cumberland County)

https://digitalmaine.com/alien_docs/32993/thumbnail.jp

Alien Registration- Meskinis, Andrew (Auburn, Androscoggin County)

https://digitalmaine.com/alien_docs/22659/thumbnail.jp

Aluminium oxide film for 2D photonic structure: room temperature formation

We report about aluminium anodic oxide films (AOFs) as self-organising microstructures for photonic band gap (PBG) crystal application. Structural analysis show that aluminium anodic oxide has formed a structure of randomly oriented clusters each of them consisting of neatly ordered submicrometer cells. Measurements show that at room temperature pores of up to 460 nm wide can be formed, thus, opening a PEG in the visible. Doping of aluminium AOFs by Ag and CdS, is demonstrated