1 Ocak 2013 Dergi makalesi Açık Erişim

Kok, Mediha; Pirge, Gursev; Aydogdu, Yildirim

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  <identifier identifierType="URL">https://aperta.ulakbim.gov.tr/record/12971</identifier>
  <creators>
    <creator>
      <creatorName>Kok, Mediha</creatorName>
      <givenName>Mediha</givenName>
      <familyName>Kok</familyName>
      <affiliation>Firat Univ, Dept Phys, Fac Sci, TR-23169 Elazig, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Pirge, Gursev</creatorName>
      <givenName>Gursev</givenName>
      <familyName>Pirge</familyName>
      <affiliation>Turkish AF Acad, Inst Aeronaut &amp; Space Technol, Istanbul, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Aydogdu, Yildirim</creatorName>
      <givenName>Yildirim</givenName>
      <familyName>Aydogdu</familyName>
      <affiliation>Gazi Univ, Fac Sci, Dept Phys, Ankara, Turkey</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Isothermal Oxidation Study On Nimnga Ferromagnetic Shape Memory Alloy At 600-1000 Degrees C</title>
  </titles>
  <publisher>Aperta</publisher>
  <publicationYear>2013</publicationYear>
  <dates>
    <date dateType="Issued">2013-01-01</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://aperta.ulakbim.gov.tr/record/12971</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1016/j.apsusc.2012.12.033</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://www.opendefinition.org/licenses/cc-by">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">Oxidation behavior of NiMnGa alloy has been investigated under isothermal temperature by thermo gravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy equipped with an energy dispersive X-ray (SEM-EDX) spectroscope systems. The Ni-28.5Mn-20.5Ga alloy (composition in atomic percent) was exposed to oxygen atmosphere isothermally, i.e., between 600 degrees C and 1000 degrees C, for 1 h. A gravimetric method was used to determine the oxidation kinetics; weight gain per unit area as a function of time. It was determined that the oxidation constant increases significantly with isothermal temperature. Activation energy of the oxidation was found to be 152 kJ/mol. X-ray diffraction patterns of the heat-treated samples contain oxide peaks, mainly belonging to Mn3O4. X-ray analyses demonstrate that the amount of the oxide increases with isothermal temperature while that of martensite phase decreases. The scanning electron microscopy equipped with an energy dispersive X-ray (SEM-EDX) spectroscope analysis also gives the same result. According to magnetic measurements, the saturation of NiMnGa alloys decreases with rising isothermal oxidation temperature. (C) 2012 Elsevier B. V. All rights reserved.</description>
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