Açık Akademik Arşiv Sistemi

Fast production of high entropy alloys (CoCrFeNiAlxTiy) by electric current activated sintering system

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dc.contributor.authors Erdogan, A; Yener, T; Zeytin, S;
dc.date.accessioned 2020-10-16T11:05:41Z
dc.date.available 2020-10-16T11:05:41Z
dc.date.issued 2018
dc.identifier.citation Erdogan, A; Yener, T; Zeytin, S; (2018). Fast production of high entropy alloys (CoCrFeNiAlxTiy) by electric current activated sintering system. VACUUM, 155, 72-64
dc.identifier.issn 0042-207X
dc.identifier.uri https://doi.org/10.1016/j.vacuum.2018.05.027
dc.identifier.uri https://hdl.handle.net/20.500.12619/69719
dc.description.abstract Electric current assisted sintering (ECAS) can be a new production method for high entropy alloy production due to its advantages such as low sintering temperature and short holding time. In this study, production of CoCrFeNiAlxTiy alloys (x:0.5, y:0,05, 1; y:0.5, x:0, 1) was carried out in electric current activated/assisted sintering system in open air with a uniaxial contact pressure of 35 MPa at 2500 A for 5 min. Microstructural and micro hardness properties of samples are determined. After sintering, depending on the composition, solid solution phases such as FCC (FeNi), BCC (FeCr) were formed in all alloys. In alloys other than CoCrFeNiAl0.5, sigma and intermetallic phases are formed. According to SEM-EDS analyses, the elements with high negative mixing enthalpy are gathered together and the dark phases are enriched from the Al-Ni-Ti while the Fe-Cr is precipitated due to its high concentration around this phase. Thanks to intermetallic phases formed by the lattice distortion of Al and Ti elements with high atomic radius, the hardness was obtained as 401 H V in CoCrFeNiAl0.5 alloy and 700 H V in CoCrFeNiAl0.5Ti0.5 alloy. Alloys were subjected to homogenization heat treatment at 1200 degrees C for 18 h after sintering. As a result of homogenization, the increase in the formation of sigma phase is generally multiplied. While the microstructure distribution became more homogeneous by annealing, an increase in the lattice parameters of the phases was generally observed. Hardness values increased up to 496 H V in the CoCrFeNiAl0.5 alloy and 956 H V in the CoCrFeNiAl(0.5)Tio(0.5) alloy due to the increase in distortion and high hardness sigma phase due to the increase of the lattice parameters.
dc.language English
dc.publisher PERGAMON-ELSEVIER SCIENCE LTD
dc.subject Physics
dc.title Fast production of high entropy alloys (CoCrFeNiAlxTiy) by electric current activated sintering system
dc.type Article
dc.identifier.volume 155
dc.identifier.startpage 64
dc.identifier.endpage 72
dc.contributor.department Sakarya Üniversitesi/Mühendislik Fakültesi/Metalurji Ve Malzeme Mühendisliği Bölümü
dc.contributor.saüauthor Yener, Tuba
dc.contributor.saüauthor Yener, Tuba
dc.contributor.saüauthor Zeytin, Sakin
dc.relation.journal VACUUM
dc.identifier.wos WOS:000445440800011
dc.identifier.doi 10.1016/j.vacuum.2018.05.027
dc.contributor.author Azmi Erdogan
dc.contributor.author Yener, Tuba
dc.contributor.author Yener, Tuba
dc.contributor.author Zeytin, Sakin


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