Metastable intermetallic phases in the Al-Sm system

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dc.contributor.author Zhou, S. H.
dc.contributor.author Napolitano, Ralph
dc.contributor.author Meng, F. Q.
dc.contributor.author Kramer, Matthew
dc.contributor.author Ott, Ryan
dc.contributor.author Zhang, Feng
dc.contributor.author Ye, Zhuo
dc.contributor.author Jain, Shubhra
dc.contributor.author Napolitano, Ralph
dc.contributor.department Ames Laboratory
dc.contributor.department Materials Science and Engineering
dc.date 2019-12-27T21:24:09.000
dc.date.accessioned 2020-06-30T06:08:31Z
dc.date.available 2020-06-30T06:08:31Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2019
dc.date.embargo 2021-09-30
dc.date.issued 2019-12-01
dc.description.abstract <p>The thermodynamic landscape involving several metastable phases in the glass-forming Al-Sm system is assessed, integrating experimental measurements and first principles calculations into a comprehensive CALPHAD description. The phases examined here include Al41Sm5-η, Al60Sm11-ε, Al5Sm-θ, Al5Sm-π and Al4Sm-γ, having basis stoichiometries from 9 to 20 at% Sm, a range over which the Al-fcc and Al3Sm phases are stable. Amongst the metastable phases examined, our findings indicate that the Al41Sm5-η and Al60Sm11-ε phases comprise the convex hull of minimum formation energies at absolute zero. Competitive crystallization processes were investigated through situ X-ray diffraction and differential scanning calorimetry and used to assess relative stability within the overall landscape. Asserting thermodynamic scenarios consistent with our measurements, temperature-dependent Gibbs free energies for the metastable phases are proposed along with the corresponding constrained phase diagrams, comprehensively showing metastable phases and associated invariant reactions. Assumptions and limitations of the proposed thermodynamic model are discussed with reference to available transport data.</p>
dc.description.comments <p>This is a manuscript of an article published as Zhou, S. H., F. Q. Meng, M. J. Kramer, R. T. Ott, F. Zhang, Z. Ye, S. Jain, and R. E. Napolitano. "Metastable intermetallic phases in the Al-Sm system." <em>Materials Today Communications</em> 21 (2019): 100673. DOI: <a href="http://dx.doi.org/10.1016/j.mtcomm.2019.100673" target="_blank">10.1016/j.mtcomm.2019.100673</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/mse_pubs/351/
dc.identifier.articleid 1354
dc.identifier.contextkey 15529077
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath mse_pubs/351
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/55696
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/mse_pubs/351/2019_NapolitanoRalph_MetastableIntermetallic.pdf|||Fri Jan 14 23:44:37 UTC 2022
dc.source.uri 10.1016/j.mtcomm.2019.100673
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Metallurgy
dc.subject.keywords intermetallic
dc.subject.keywords metastability
dc.subject.keywords X-ray diffraction
dc.subject.keywords CALPHAD
dc.subject.keywords devitrification
dc.title Metastable intermetallic phases in the Al-Sm system
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 5d15ca50-0822-4c99-a260-7004cd21408d
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
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