EFFECT OF GROWTH RATE ON COARSENING OF SECONDARY DENDRITE ARM SPACINGS IN DIRECTIONALLY SOLIDIFIED OF Al-8.8La-1.2Ni TERNARY ALLOY

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dc.authoridUSTUN, Erkan/0000-0002-7745-396X
dc.contributor.authorUstun, Erkan
dc.contributor.authorCadirli, Emin
dc.date.accessioned2024-11-07T13:25:09Z
dc.date.available2024-11-07T13:25:09Z
dc.date.issued2022
dc.departmentNiğde Ömer Halisdemir Üniversitesi
dc.description.abstractOne of the most important factors directly affecting microstructure and mechanical properties in directional solidification process is secondary dendrite arm spacing (SDAS). It is very important to measure the SDAS and examine the factors that may affect them. To investigate the effort of growth rate on the SDAS, the alloy specimens were directional solidified upward with different growth rates ( V= 8.3-83.0 mu m/s) at a constant temperature gradient (G = 4 K/mm) in a Bridgman-type growth apparatus. After the specimens are directionally solidified, they were exposed to metallographic processes in order to observe the dendritic solidification structure on the longitudinal section of the specimens. Coarsen secondary dendrite ann spacings (lambda(2C)) were measured excluding the first arms near the tip of the dendrite. Local solidification times (t(f)) were calculated by ratio of spacings to growth rates. It was detennined that the t(f) values decreased with increasing V values. The relationships between t(f) and lambda(2C) were defined by means of the binary regression analysis. Exponent values of t(f) were obtained as 0.37, 0.43, 0.46 and 0.47 according to increasing V values, respectively. These exponent values are close to the exponent value (0.33) predicted by the Rappaz-Boettinger theoretical model and good agreement with the exponent values (0.33-0.50) obtained by other experimental studies.
dc.identifier.doi10.24425/amm.2022.139685
dc.identifier.endpage938
dc.identifier.issn1733-3490
dc.identifier.issn2300-1909
dc.identifier.issue3
dc.identifier.scopus2-s2.0-85130439680
dc.identifier.scopusqualityQ4
dc.identifier.startpage931
dc.identifier.urihttps://doi.org/10.24425/amm.2022.139685
dc.identifier.urihttps://hdl.handle.net/11480/14546
dc.identifier.volume67
dc.identifier.wosWOS:000850096100006
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherPolska Akad Nauk, Polish Acad Sciences, Inst Metall & Mater Sci Pas
dc.relation.ispartofArchives of Metallurgy and Materials
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_20241106
dc.subjectDirectional solidification
dc.subjectAl-La-Ni ternary alloys
dc.subjectcoarsening
dc.subjectsecondary dendrite ann spacing
dc.titleEFFECT OF GROWTH RATE ON COARSENING OF SECONDARY DENDRITE ARM SPACINGS IN DIRECTIONALLY SOLIDIFIED OF Al-8.8La-1.2Ni TERNARY ALLOY
dc.typeArticle

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