Yüksek entropili alaşımlar sahip oldukları üstün özellikleri sayesinde süper alaşımlara alternatif olarak önerilmektedir. Yüksek entropili alaşımlar araştırılmaya devam ettikçe ortaya çıkan özgün ve ...üstün özellikleri sayesinde geniş alanlarda kullanılabilir olmasıyla birlikte önemi gittikçe artmaktadır. Bu çalışmada mekanik alaşımlama tekniği ile AlCuCrFeNi tozları sentezlenmiştir. Sentezlenen tozlarda YMK (Yüzey Merkezli Kübik), HMK (Hacim Merkezli Kübik) ve B2 fazları tespit edilmiştir. Tozlar peletlendikten sonra fiziksel buhar biriktirme (FBB) tekniği ile Monel 400 altlık malzeme üzerine biriktirilmiştir. Üretilen kaplamanın mikroyapısal özellikleri incelenmiştir. Üretim sonrası homojene yakın bir ince film tabakası üretilmiştir.
High entropy alloys have been proposed as an alternative to superalloys due to having unique properties. As high entropy alloys continue to be researched, their importance is increasing with their unique and superior properties that can be used in wide areas. In this study, AlCuCrFeNi powders were synthesized by mechanical alloying technique. FCC (Face Centered Cubic), BCC (Body Centered Cubic) and B2 phases were detected in the synthesized powders. After the powders were pelleted, they were deposited on the Monel 400 substrate by the physical vapor deposition (PVD) technique. In this research, the microstructural properties of the produced coating were investigated. After production, an almost homogeneous thin film layer was produced.
In this study, severe shot peening (SSP) has been performed to commercially pure titanium (Grade 2) specimens in order to expose severe plastic deformations to the material surface. S230 shot media ...with higher air pressure conditions have been selected for SSP. A nanocrystalline layer has been created by means of severe plastic deformation. The nanograined structure has been investigated via XRD, FESEM, and microhardness methods. SSP specimens have been subjected to thermal oxidation treatment in air at 500 and 700 °C for 2 and 16 h. Severe shot peened commercially pure titanium has a thicker oxide layer when compared to as received ones. The results show that both SSP and thermal oxidation improve the wear characteristics.
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Hot corrosion is a very destructive failure mechanism for thermal barrier coatings (TBCs) during service conditions. In the present study, a CoNiCrAlY is coated using atmospheric plasma spray (APS) ...and high velocity oxy-fuel (HVOF) techniques which produces TBCs that were exposed to 50% Na2SO4 and 50% V2O5 molten salts at 1000 °C. The top surface was visually inspected at the end of each four-hour cycle to determine the lifetime of TBCs. The failure criteria required for the termination of the hot corrosion cycles was assumed to be 25% cracking and spallation of top coats. X-Ray Diffraction (XRD) analysis was performed before and after hot corrosion tests in order to observe new phases which may occur in the top coating. After scanning electron microscopy (SEM) images of cross-section samples of hot corrosion tests are completed, samples were taken. As a result, it has been observed that the lifetimes of HVOF bond-coated TBCs are longer.
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FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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