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Öğe Directional solidification of pure succinonitrile and succinonitrile- salol alloys(2001) Karaca I.; Çadirli E.; Kaya H.; Maraşli N.Pure succinonitrile (SCN) and succinonitrile-salol alloys with four different concentrations of salol were unidirectionally solidified at five different growth rates in a temperature gradient. The microstructure parameters, viz., the primary dendrite arm spacing ?1, dendrite tip radius R and mushy zone depth d, were measured. The dependence of the microstructure parameters on the solidification parameters for pure SCN and SCN-Salol alloys were determined via linear regression analysis. The results are compared with published data.Öğe Microhardness Characterization of Fe- and Co-Based Superalloys(Springer International Publishing, 2019) Karaca I.; Büyükakkas S.The reverse indentation load-size effects of Fe–Mn–Si and Co–Mn–Si superalloy have been investigated by measuring Vickers hardness. The characterized superalloy samples are presented in the reverse indentation load-size effects, which is known as the microhardness increases with increasing applied load behavior. The theoretical model is rearranged and investigated according to the reverse indentation load-size effects using reconstituted Meyer law, proportional specimen resistance model, and modified proportional specimen resistance model. The reconstituted modified proportional specimen resistance model is highly suitable for describing the data of the Fe–Mn–Si and Co–Mn–Si alloys. SEM micrographs show that Co-based alloys exhibited a dendritic microstructure and Fe-based alloys were presented austenitic microstructure. In this study, the load range from 0.49 to 9.8 N was applied to the materials, but no crack is observed on the surface of the material. This can only be attributed to the occurrence of the elastic deformation which yields reverse indentation size effect in these samples. © 2018, Shiraz University.
